[PATCH v6 00/11] Refactor Microchip MCP47FEB02 I2C driver in separate modules to add support for MCP48FEB02 SPI driver

[PATCH v6 00/11] Refactor Microchip MCP47FEB02 I2C driver in separate modules to add support for MCP48FEB02 SPI driver

[Ariana Lazar]

Refactor I2C driver implementation into separate modules in order to add
support for SPI MCP48FxBy1/2/4/8 DAC family on top of the I2C
implementation. The I2C and SPI devices have the same memory map and
supported functionalities.

Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
Changes in v6:
- use field_get() in Gain, Vref and Power-Down registers channel formulas
- rebase from 7.2 to 7.3-rc1
- add fixes tags and Cc stable in the commit messages
- add numeric constants in front of time defines for better readability
- replaced dev_err() with dev_warn_probe() for missing label
- if match data is not found at probe, return -ENODATA and a suitable
    error message
- Link to v5: https://lore.kernel.org/r/20260909-mcp47feb02_refactor-v5-0-8b67bcab93d1@microchip.com

Changes in v5:
- improve commit messages by justifying the changes made
- increase polling time for EEPROM writes
- delete unnecessary comments and extra blank line from header file
- Link to v4: https://lore.kernel.org/r/20260819-mcp47feb02_refactor-v4-0-beb2aa3bfd09@microchip.com

Changes in v4:
- remove unused headers
- add missing header types.h in protocol files
- create 6 precursor commits before the refactor patch for handling:
    - comment typo
    - renaming command mask define
    - for an invalid label use a debug message instead of probe error
    - correct return value in store_eeprom_store() for false state case
    - correct channel gain formula
    - read DAC value register to initialize channel data struct field at
      probe 
- Link to v3: https://lore.kernel.org/r/20260804-mcp47feb02_refactor-v3-0-97f8b81f3628@microchip.com

Changes in v3:
- renumbering the patch version to include the first patch submision
- fix review comments device tree binding:
   - change 'additionalProperties' to unevaluatedProperties
   - add else branch with spi-max-frequency in the condition which checks
     if a device has SPI interface
   - correct SPI address example
   - add clock polarity and clock phase properties for SPI devices
   - enumerate I2C devices in lexicographic order from the description section
   - specify supported SPI modes using dependencies
- fix review comments driver:
   - remove unneccesarry libraries and add the missing ones
   - correct comment typo
   - return -ENODEV using dev_err_probe() in protocol probe functions
   - use named initializers
   - move defines for registers and enums from the header to the core file
   - add dev_set_drvdata() in probe()
   - move mutex aquiring from mcp47feb02_write_to_eeprom() to
     store_eeprom_store()
   - write correct value into Vref register in resume()
- Link to v2: https://lore.kernel.org/r/20260723-mcp47feb02_refactor-v1-0-ee59e63672bc@microchip.com

v2:
- include in the same patch series the refactoring of the driver and the
  support for SPI devices, but in different patches
- remove changes regarding review comments received not related to the
  code refactoring
- first version of the combined refactoring I2C and adding support for SPI
  driver
- Link to v1: https://lore.kernel.org/all/20260403-mcp47feb02-fix2-v1-1-da60c773550e@microchip.com

v1:
- first version which did not separate the refactoring and adding support for
  SPI devices (into different patches from the same series)

---
Ariana Lazar (11):
      iio: dac: mcp47feb02: initialize dac_data field in channel data struct at probe
      iio: dac: mcp47feb02: Fix gain field initialization for active channels
      iio: dac: mcp47feb02: use field_get() instead of custom dynamic macros
      iio: dac: mcp47feb02: Return len when disabling EEPROM store
      iio: dac: mcp47feb02: Increase EEPROM Programming Write Cycle Time
      iio: dac: mcp47feb02: Avoid unjustified probe error on missing label
      iio: dac: mcp47feb02: correct typo from a comment
      iio: dac: mcp47feb02: rename channel mask and value macros
      iio: dac: mcp47feb02: refactor MCP47FEB02 I2C driver into two modules
      dt-bindings: iio: dac: add support for MCP48FEB02 SPI
      iio: dac: add support for Microchip MCP48FEB02

 .../bindings/iio/dac/microchip,mcp47feb02.yaml     | 221 +++++++++---
 MAINTAINERS                                        |   2 +-
 drivers/iio/dac/Kconfig                            |  32 +-
 drivers/iio/dac/Makefile                           |   4 +-
 .../iio/dac/{mcp47feb02.c => mcp47feb02-core.c}    | 373 +++------------------
 drivers/iio/dac/mcp47feb02-i2c.c                   | 145 ++++++++
 drivers/iio/dac/mcp47feb02-spi.c                   | 145 ++++++++
 drivers/iio/dac/mcp47feb02.h                       |  43 +++
 8 files changed, 591 insertions(+), 374 deletions(-)
---
base-commit: cee9395acd8043be0644b25c34bfa86623f2b935
change-id: 20260625-mcp47feb02_refactor-fa8420ae3282

Best regards,
-- 
Ariana Lazar <ariana.lazar@microchip.com>

[PATCH v6 01/11] iio: dac: mcp47feb02: initialize dac_data field in channel data struct at probe

[Ariana Lazar]

Prevent operations which use cache from overwriting default hardware values
with zeros by reading active DAC registers during probe to correctly
initialize the channel struct DAC values.

Fixes: bf394cc80369 ("iio: dac: adding support for Microchip MCP47FEB02")
Reported-by: sashiko-bot@kernel.org
Link: https://lore.kernel.org/all/20260804134616.1D8A21F00A3E@smtp.kernel.org/
Cc: stable@vger.kernel.org
Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
 drivers/iio/dac/mcp47feb02.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/dac/mcp47feb02.c b/drivers/iio/dac/mcp47feb02.c
index 8640b0ef4433da2b40d4b7e53fe6109737314951..6a3875e1d6a2c0cdd146410358130c44b1360f56 100644
--- a/drivers/iio/dac/mcp47feb02.c
+++ b/drivers/iio/dac/mcp47feb02.c
@@ -1019,7 +1019,12 @@ static int mcp47feb02_init_ctrl_regs(struct mcp47feb02_data *data)
 	gain_ch = gain_ch & MCP47FEB02_GAIN_BITS_MASK;
 	for_each_set_bit(i, &data->active_channels_mask, data->phys_channels) {
 		struct device *dev = regmap_get_device(data->regmap);
-		unsigned int pd_tmp;
+		unsigned int pd_tmp, dac_val;
+
+		ret = regmap_read(data->regmap, REG_ADDR(i), &dac_val);
+		if (ret)
+			return ret;
+		data->chdata[i].dac_data = dac_val;
 
 		data->chdata[i].ref_mode = (vref_ch >> (2 * i)) & MCP47FEB02_DAC_CTRL_MASK;
 		data->chdata[i].use_2x_gain = (gain_ch >> i)  & MCP47FEB02_GAIN_BIT_MASK;

-- 
2.43.0

[PATCH v6 02/11] iio: dac: mcp47feb02: Fix gain field initialization for active channels

[Ariana Lazar]

As per MCP47FXBX48 Datasheet, in the format of the Gain Control and System
Status Register each DAC channel has one bit to control its gain,
starting at bit 8, while bits 0-7 contain status or unimplemented bits.

The previous formula didn't initialize correctly all channels, being
replaced by using field_get() with the already defined macro used in write
operations where needed in the rest of the driver implementation.
DAC_GAIN_MASK(i) extracts the gain control bit for each active channel
correctly in one step.

Fixes: bf394cc80369 ("iio: dac: adding support for Microchip MCP47FEB02")
Reported-by: sashiko-bot@kernel.org
Link: https://lore.kernel.org/all/20260804134616.1D8A21F00A3E@smtp.kernel.org/
Cc: stable@vger.kernel.org
Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
 drivers/iio/dac/mcp47feb02.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/iio/dac/mcp47feb02.c b/drivers/iio/dac/mcp47feb02.c
index 6a3875e1d6a2c0cdd146410358130c44b1360f56..fa4bd1df954844da35a8496758489189aeceb60d 100644
--- a/drivers/iio/dac/mcp47feb02.c
+++ b/drivers/iio/dac/mcp47feb02.c
@@ -1016,7 +1016,6 @@ static int mcp47feb02_init_ctrl_regs(struct mcp47feb02_data *data)
 	if (ret)
 		return ret;
 
-	gain_ch = gain_ch & MCP47FEB02_GAIN_BITS_MASK;
 	for_each_set_bit(i, &data->active_channels_mask, data->phys_channels) {
 		struct device *dev = regmap_get_device(data->regmap);
 		unsigned int pd_tmp, dac_val;
@@ -1027,7 +1026,7 @@ static int mcp47feb02_init_ctrl_regs(struct mcp47feb02_data *data)
 		data->chdata[i].dac_data = dac_val;
 
 		data->chdata[i].ref_mode = (vref_ch >> (2 * i)) & MCP47FEB02_DAC_CTRL_MASK;
-		data->chdata[i].use_2x_gain = (gain_ch >> i)  & MCP47FEB02_GAIN_BIT_MASK;
+		data->chdata[i].use_2x_gain = field_get(DAC_GAIN_MASK(i), gain_ch);
 
 		/*
 		 * Inform the user that the current voltage reference read from the volatile

-- 
2.43.0

[PATCH v6 03/11] iio: dac: mcp47feb02: use field_get() instead of custom dynamic macros

[Ariana Lazar]

Replace manual bit operations which select channel corresponding bits
from a control register in mcp47feb02_init_ctrl_regs() with field_get()
macro used with masks already defined for regmap operations within the
driver.

Reported-by: Jonathan Cameron <jic23@kernel.org>
Link: https://lore.kernel.org/all/20260913224339.490d89ba@jic23-hlaptop/
Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
 drivers/iio/dac/mcp47feb02.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/dac/mcp47feb02.c b/drivers/iio/dac/mcp47feb02.c
index fa4bd1df954844da35a8496758489189aeceb60d..81aa9063fcf730342d4af114da73ac2fc550243f 100644
--- a/drivers/iio/dac/mcp47feb02.c
+++ b/drivers/iio/dac/mcp47feb02.c
@@ -1025,7 +1025,7 @@ static int mcp47feb02_init_ctrl_regs(struct mcp47feb02_data *data)
 			return ret;
 		data->chdata[i].dac_data = dac_val;
 
-		data->chdata[i].ref_mode = (vref_ch >> (2 * i)) & MCP47FEB02_DAC_CTRL_MASK;
+		data->chdata[i].ref_mode = field_get(DAC_CTRL_MASK(i), vref_ch);
 		data->chdata[i].use_2x_gain = field_get(DAC_GAIN_MASK(i), gain_ch);
 
 		/*
@@ -1069,7 +1069,7 @@ static int mcp47feb02_init_ctrl_regs(struct mcp47feb02_data *data)
 			break;
 		}
 
-		pd_tmp = (pd_ch >> (2 * i)) & MCP47FEB02_DAC_CTRL_MASK;
+		pd_tmp = field_get(DAC_CTRL_MASK(i), pd_ch);
 		data->chdata[i].powerdown_mode = pd_tmp ? (pd_tmp - 1) : pd_tmp;
 		data->chdata[i].powerdown = !!(data->chdata[i].powerdown_mode);
 	}

-- 
2.43.0

[PATCH v6 04/11] iio: dac: mcp47feb02: Return len when disabling EEPROM store

[Ariana Lazar]

When state is false, return the number of bytes (len) the buffer has
instead of 0 to properly signal that the input buffer was fully consumed,
preventing unnecessary write retries.

Fixes: bf394cc80369 ("iio: dac: adding support for Microchip MCP47FEB02")
Reported-by: sashiko-bot@kernel.org
Link: https://lore.kernel.org/all/20260804134616.1D8A21F00A3E@smtp.kernel.org/
Cc: stable@vger.kernel.org
Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
 drivers/iio/dac/mcp47feb02.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/mcp47feb02.c b/drivers/iio/dac/mcp47feb02.c
index 81aa9063fcf730342d4af114da73ac2fc550243f..117fd41257d5cd430c00847ff64c22c6700dbb6a 100644
--- a/drivers/iio/dac/mcp47feb02.c
+++ b/drivers/iio/dac/mcp47feb02.c
@@ -468,7 +468,7 @@ static ssize_t store_eeprom_store(struct device *dev, struct device_attribute *a
 		return ret;
 
 	if (!state)
-		return 0;
+		return len;
 
 	/*
 	 * Verify DAC Wiper and DAC Configuration are unlocked. If both are disabled,

-- 
2.43.0

[PATCH v6 05/11] iio: dac: mcp47feb02: Increase EEPROM Programming Write Cycle Time

[Ariana Lazar]

Increase the EEPROM write polling timeout to prevent -ETIMEDOUT errors and
incomplete nonvolatile write cycle, according to the time specified in the
datasheets (11-16 ms).

Fixes: bf394cc80369 ("iio: dac: adding support for Microchip MCP47FEB02")
Reported-by: sashiko-bot@kernel.org
Link: https://lore.kernel.org/all/20260819125300.6B9211F000E9@smtp.kernel.org/
Cc: stable@vger.kernel.org
Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
 drivers/iio/dac/mcp47feb02.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/dac/mcp47feb02.c b/drivers/iio/dac/mcp47feb02.c
index 117fd41257d5cd430c00847ff64c22c6700dbb6a..a93e05cda5f36baf8f7573a1bd92bf6167227362 100644
--- a/drivers/iio/dac/mcp47feb02.c
+++ b/drivers/iio/dac/mcp47feb02.c
@@ -448,7 +448,7 @@ static int mcp47feb02_write_to_eeprom(struct mcp47feb02_data *data, unsigned int
 	ret = regmap_read_poll_timeout(data->regmap, MCP47FEB02_GAIN_CTRL_STATUS_REG_ADDR,
 				       eewa_val,
 				       !(eewa_val & MCP47FEB02_GAIN_BIT_STATUS_EEWA_MASK),
-				       USEC_PER_MSEC, USEC_PER_MSEC * 5);
+				       1 * USEC_PER_MSEC, 150 * USEC_PER_MSEC);
 	if (ret)
 		return ret;
 
@@ -508,7 +508,7 @@ static ssize_t store_eeprom_store(struct device *dev, struct device_attribute *a
 
 	ret = regmap_read_poll_timeout(data->regmap, MCP47FEB02_GAIN_CTRL_STATUS_REG_ADDR, eewa_val,
 				       !(eewa_val & MCP47FEB02_GAIN_BIT_STATUS_EEWA_MASK),
-				       USEC_PER_MSEC, USEC_PER_MSEC * 5);
+				       1 * USEC_PER_MSEC, 150 * USEC_PER_MSEC);
 	if (ret)
 		return ret;
 

-- 
2.43.0

[PATCH v6 06/11] iio: dac: mcp47feb02: Avoid unjustified probe error on missing label

[Ariana Lazar]

Fix unjustified probe error on missing optional 'label' property by
replacing dev_err_probe() with dev_warn_probe(). Correct %pfw usage by
passing the child fwnode handle directly in the error message. Besides the
probe warning a read error is returned at the attempt of reading a null
label.

Fixes: bf394cc80369 ("iio: dac: adding support for Microchip MCP47FEB02")
Reported-by: sashiko-bot@kernel.org
Link: https://lore.kernel.org/all/20260804134616.1D8A21F00A3E@smtp.kernel.org/
Cc: stable@vger.kernel.org
Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
 drivers/iio/dac/mcp47feb02.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/dac/mcp47feb02.c b/drivers/iio/dac/mcp47feb02.c
index a93e05cda5f36baf8f7573a1bd92bf6167227362..67bf8d9d9835095263b2ca6b710acca60612354a 100644
--- a/drivers/iio/dac/mcp47feb02.c
+++ b/drivers/iio/dac/mcp47feb02.c
@@ -922,7 +922,10 @@ static int mcp47feb02_read_label(struct iio_dev *indio_dev, struct iio_chan_spec
 {
 	struct mcp47feb02_data *data = iio_priv(indio_dev);
 
-	return sysfs_emit(label, "%s\n", data->labels[ch->address]);
+	if (data->labels[ch->address])
+		return sysfs_emit(label, "%s\n", data->labels[ch->address]);
+
+	return -ENOENT;
 }
 
 static const struct iio_info mcp47feb02_info = {
@@ -977,8 +980,7 @@ static int mcp47feb02_parse_fw(struct iio_dev *indio_dev,
 
 		ret = fwnode_property_read_string(child, "label", &data->labels[reg]);
 		if (ret)
-			return dev_err_probe(dev, ret, "%pfw: invalid label\n",
-					     fwnode_get_name(child));
+			dev_warn_probe(dev, ret, "%pfw: invalid label\n", child);
 
 		chanspec.address = reg;
 		chanspec.channel = reg;

-- 
2.43.0

[PATCH v6 07/11] iio: dac: mcp47feb02: correct typo from a comment

[Ariana Lazar]

Typo corrected to 'Register' in the comment regarding defined masks for the
gain register.

Reported-by: Joshua Crofts <joshua.crofts1@gmail.com>
Link: https://lore.kernel.org/all/20260723231859.03f92ce6@systembl0wer/
Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
 drivers/iio/dac/mcp47feb02.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/mcp47feb02.c b/drivers/iio/dac/mcp47feb02.c
index 67bf8d9d9835095263b2ca6b710acca60612354a..8dac4e2fb74fe4563324343ce215af3389129130 100644
--- a/drivers/iio/dac/mcp47feb02.c
+++ b/drivers/iio/dac/mcp47feb02.c
@@ -52,7 +52,7 @@
 #define DAC_CTRL_MASK(ch)				(GENMASK(1, 0) << (2 * (ch)))
 #define DAC_CTRL_VAL(ch, val)				((val) << (2 * (ch)))
 
-/* Gain Control and I2C Slave Address Reguster fields */
+/* Gain Control and I2C Slave Address Register fields */
 #define DAC_GAIN_MASK(ch)				(BIT(0) << (8 + (ch)))
 #define DAC_GAIN_VAL(ch, val)				((val) << (8 + (ch)))
 

-- 
2.43.0

[PATCH v6 08/11] iio: dac: mcp47feb02: rename channel mask and value macros

[Ariana Lazar]

Rename generic DAC_CTRL_MASK/VAL macros to MCP47FEB02_VREF_PD_MASK/VAL
in order to clearly indicate for which control registers these channel
masks are suitable.

Reported-by: Jonathan Cameron <jic23@kernel.org>
Link: https://lore.kernel.org/all/20260528125140.16a8f173@jic23-huawei/
Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
 drivers/iio/dac/mcp47feb02.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/iio/dac/mcp47feb02.c b/drivers/iio/dac/mcp47feb02.c
index 8dac4e2fb74fe4563324343ce215af3389129130..5c09ca25a75e0ecb2bfc5a2d5e62e5f7d3156810 100644
--- a/drivers/iio/dac/mcp47feb02.c
+++ b/drivers/iio/dac/mcp47feb02.c
@@ -49,8 +49,8 @@
 #define MCP47FEB02_NV_I2C_SLAVE_ADDR_MASK		GENMASK(7, 0)
 
 /* Voltage reference, Power-Down control register and DAC Wiperlock status register fields */
-#define DAC_CTRL_MASK(ch)				(GENMASK(1, 0) << (2 * (ch)))
-#define DAC_CTRL_VAL(ch, val)				((val) << (2 * (ch)))
+#define MCP47FEB02_VREF_PD_MASK(ch)			(GENMASK(1, 0) << (2 * (ch)))
+#define MCP47FEB02_VREF_PD_VAL(ch, val)			((val) << (2 * (ch)))
 
 /* Gain Control and I2C Slave Address Register fields */
 #define DAC_GAIN_MASK(ch)				(BIT(0) << (8 + (ch)))
@@ -555,7 +555,8 @@ static int mcp47feb02_suspend(struct device *dev)
 		data->chdata[ch].powerdown = true;
 		pd_mode = data->chdata[ch].powerdown_mode + 1;
 		ret = regmap_update_bits(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR,
-					 DAC_CTRL_MASK(ch), DAC_CTRL_VAL(ch, pd_mode));
+					 MCP47FEB02_VREF_PD_MASK(ch),
+					 MCP47FEB02_VREF_PD_VAL(ch, pd_mode));
 		if (ret)
 			return ret;
 
@@ -587,7 +588,8 @@ static int mcp47feb02_resume(struct device *dev)
 			return ret;
 
 		ret = regmap_update_bits(data->regmap, MCP47FEB02_VREF_REG_ADDR,
-					 DAC_CTRL_MASK(ch), DAC_CTRL_VAL(ch, pd_mode));
+					 MCP47FEB02_VREF_PD_MASK(ch),
+					 MCP47FEB02_VREF_PD_VAL(ch, pd_mode));
 		if (ret)
 			return ret;
 
@@ -598,8 +600,8 @@ static int mcp47feb02_resume(struct device *dev)
 			return ret;
 
 		ret = regmap_update_bits(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR,
-					 DAC_CTRL_MASK(ch),
-					 DAC_CTRL_VAL(ch, MCP47FEB02_NORMAL_OPERATION));
+					 MCP47FEB02_VREF_PD_MASK(ch),
+					 MCP47FEB02_VREF_PD_VAL(ch, MCP47FEB02_NORMAL_OPERATION));
 		if (ret)
 			return ret;
 	}
@@ -656,7 +658,8 @@ static ssize_t mcp47feb02_write_powerdown(struct iio_dev *indio_dev, uintptr_t p
 	 */
 	tmp_pd_mode = state ? (data->chdata[reg].powerdown_mode + 1) : MCP47FEB02_NORMAL_OPERATION;
 	ret = regmap_update_bits(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR,
-				 DAC_CTRL_MASK(reg), DAC_CTRL_VAL(reg, tmp_pd_mode));
+				 MCP47FEB02_VREF_PD_MASK(reg),
+				 MCP47FEB02_VREF_PD_VAL(reg, tmp_pd_mode));
 	if (ret)
 		return ret;
 
@@ -822,7 +825,7 @@ static int mcp47feb02_ch_scale(struct mcp47feb02_data *data, int ch, int scale)
 	}
 
 	ret = regmap_update_bits(data->regmap, MCP47FEB02_VREF_REG_ADDR,
-				 DAC_CTRL_MASK(ch), DAC_CTRL_VAL(ch, tmp_val));
+				 MCP47FEB02_VREF_PD_MASK(ch), MCP47FEB02_VREF_PD_VAL(ch, tmp_val));
 	if (ret)
 		return ret;
 
@@ -1027,7 +1030,7 @@ static int mcp47feb02_init_ctrl_regs(struct mcp47feb02_data *data)
 			return ret;
 		data->chdata[i].dac_data = dac_val;
 
-		data->chdata[i].ref_mode = field_get(DAC_CTRL_MASK(i), vref_ch);
+		data->chdata[i].ref_mode = field_get(MCP47FEB02_VREF_PD_MASK(i), vref_ch);
 		data->chdata[i].use_2x_gain = field_get(DAC_GAIN_MASK(i), gain_ch);
 
 		/*
@@ -1071,7 +1074,7 @@ static int mcp47feb02_init_ctrl_regs(struct mcp47feb02_data *data)
 			break;
 		}
 
-		pd_tmp = field_get(DAC_CTRL_MASK(i), pd_ch);
+		pd_tmp = field_get(MCP47FEB02_VREF_PD_MASK(i), pd_ch);
 		data->chdata[i].powerdown_mode = pd_tmp ? (pd_tmp - 1) : pd_tmp;
 		data->chdata[i].powerdown = !!(data->chdata[i].powerdown_mode);
 	}

-- 
2.43.0

[PATCH v6 09/11] iio: dac: mcp47feb02: refactor MCP47FEB02 I2C driver into two modules

[Ariana Lazar]

Prepare the driver for the bus-specific code by refactoring into separate
files. The renamed file will contain the common DAC functionality shared by
the MCP47FxBy1/2/4/8 I2C and MCP48FxBy1/2/4/8 SPI drivers. The MCP47FEB02
driver was refactored into two modules: mcp47feb02-core.c and
mcp47feb02-i2c.c in order to prepare the support for SPI MCP48FxBy1/2/4/8
DAC family on top of the current implementation.

Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
 MAINTAINERS                                        |   2 +-
 drivers/iio/dac/Kconfig                            |   9 +-
 drivers/iio/dac/Makefile                           |   3 +-
 .../iio/dac/{mcp47feb02.c => mcp47feb02-core.c}    | 326 ++-------------------
 drivers/iio/dac/mcp47feb02-i2c.c                   | 145 +++++++++
 drivers/iio/dac/mcp47feb02.h                       |  43 +++
 6 files changed, 221 insertions(+), 307 deletions(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 3a19da74d00c9dfb48e900df71a86d4686d3ec2c..81abeab698f43bcfb755ed59ce1217bea1a28eb8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16297,7 +16297,7 @@ M:	Ariana Lazar <ariana.lazar@microchip.com>
 L:	linux-iio@vger.kernel.org
 S:	Supported
 F:	Documentation/devicetree/bindings/iio/dac/microchip,mcp47feb02.yaml
-F:	drivers/iio/dac/mcp47feb02.c
+F:	drivers/iio/dac/mcp47feb02*
 
 MCP4821 DAC DRIVER
 M:	Anshul Dalal <anshulusr@gmail.com>
diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index 3b3c77d8b3e1b6731df6e96723f92d4225e9783d..c99c32b229fb683d6407f30682f7ea6104984421 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -593,9 +593,13 @@ config MCP47A1
 	  will be called mcp47a1.
 
 config MCP47FEB02
-	tristate "MCP47F(E/V)B01/02/04/08/11/12/14/18/21/22/24/28 DAC driver"
+	tristate
+
+config MCP47FEB02_I2C
+	tristate "MCP47F(E/V)B01/02/04/08/11/12/14/18/21/22/24/28 I2C DAC driver"
 	depends on I2C
 	select REGMAP_I2C
+	select MCP47FEB02
 	help
 	  Say yes here if you want to build the driver for the Microchip:
 	  - 8-bit DAC:
@@ -611,7 +615,8 @@ config MCP47FEB02
 	  (DAC) with I2C interface.
 
 	  To compile this driver as a module, choose M here: the module
-	  will be called mcp47feb02.
+	  will be called mcp47feb02_i2c and you will also get
+	  mcp47feb02_core for the core module.
 
 config MCP4821
 	tristate "MCP4801/02/11/12/21/22 DAC driver"
diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
index 992f8930f95caed97ebad891d0f3685b4e23bf29..6377a9c42d983f615a0aa4d36a0c3d3639c62951 100644
--- a/drivers/iio/dac/Makefile
+++ b/drivers/iio/dac/Makefile
@@ -56,7 +56,8 @@ obj-$(CONFIG_MCF54415_DAC) += mcf54415_dac.o
 obj-$(CONFIG_MCP4725) += mcp4725.o
 obj-$(CONFIG_MCP4728) += mcp4728.o
 obj-$(CONFIG_MCP47A1) += mcp47a1.o
-obj-$(CONFIG_MCP47FEB02) += mcp47feb02.o
+obj-$(CONFIG_MCP47FEB02) += mcp47feb02-core.o
+obj-$(CONFIG_MCP47FEB02_I2C) += mcp47feb02-i2c.o
 obj-$(CONFIG_MCP4821) += mcp4821.o
 obj-$(CONFIG_MCP4922) += mcp4922.o
 obj-$(CONFIG_STM32_DAC_CORE) += stm32-dac-core.o
diff --git a/drivers/iio/dac/mcp47feb02.c b/drivers/iio/dac/mcp47feb02-core.c
similarity index 73%
rename from drivers/iio/dac/mcp47feb02.c
rename to drivers/iio/dac/mcp47feb02-core.c
index 5c09ca25a75e0ecb2bfc5a2d5e62e5f7d3156810..4a0abe8ad4c1629ece89d89cbcbf5cd460aaa177 100644
--- a/drivers/iio/dac/mcp47feb02.c
+++ b/drivers/iio/dac/mcp47feb02-core.c
@@ -1,8 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * IIO driver for MCP47FEB02 Multi-Channel DAC with I2C interface
+ * IIO driver for MCP47FEB02 Multi-Channel DAC with I2C and SPI interface
  *
- * Copyright (C) 2025 Microchip Technology Inc. and its subsidiaries
+ * Copyright (C) 2025-2026 Microchip Technology Inc. and its subsidiaries
  *
  * Author: Ariana Lazar <ariana.lazar@microchip.com>
  *
@@ -16,7 +16,6 @@
 #include <linux/bitfield.h>
 #include <linux/delay.h>
 #include <linux/err.h>
-#include <linux/i2c.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/kstrtox.h>
@@ -29,6 +28,8 @@
 #include <linux/types.h>
 #include <linux/units.h>
 
+#include "mcp47feb02.h"
+
 /* Register addresses must be left shifted with 3 positions in order to append command mask */
 #define MCP47FEB02_DAC0_REG_ADDR			0x00
 #define MCP47FEB02_VREF_REG_ADDR			0x40
@@ -85,220 +86,12 @@ enum mcp47feb02_gain_bit_mode {
 	MCP47FEB02_GAIN_BIT_X2 = 1,
 };
 
-static const char * const mcp47feb02_powerdown_modes[] = {
+const char * const mcp47feb02_powerdown_modes[] = {
 	"1kohm_to_gnd",
 	"100kohm_to_gnd",
 	"open_circuit",
 };
 
-/**
- * struct mcp47feb02_features - chip specific data
- * @name: device name
- * @phys_channels: number of hardware channels
- * @resolution: DAC resolution
- * @have_ext_vref1: does the hardware have an the second external voltage reference?
- * @have_eeprom: does the hardware have an internal eeprom?
- */
-struct mcp47feb02_features {
-	const char *name;
-	unsigned int phys_channels;
-	unsigned int resolution;
-	bool have_ext_vref1;
-	bool have_eeprom;
-};
-
-static const struct mcp47feb02_features mcp47feb01_chip_features = {
-	.name = "mcp47feb01",
-	.phys_channels = 1,
-	.resolution = 8,
-	.have_ext_vref1 = false,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47feb02_chip_features = {
-	.name = "mcp47feb02",
-	.phys_channels = 2,
-	.resolution = 8,
-	.have_ext_vref1 = false,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47feb04_chip_features = {
-	.name = "mcp47feb04",
-	.phys_channels = 4,
-	.resolution = 8,
-	.have_ext_vref1 = true,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47feb08_chip_features = {
-	.name = "mcp47feb08",
-	.phys_channels = 8,
-	.resolution = 8,
-	.have_ext_vref1 = true,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47feb11_chip_features = {
-	.name = "mcp47feb11",
-	.phys_channels = 1,
-	.resolution = 10,
-	.have_ext_vref1 = false,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47feb12_chip_features = {
-	.name = "mcp47feb12",
-	.phys_channels = 2,
-	.resolution = 10,
-	.have_ext_vref1 = false,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47feb14_chip_features = {
-	.name = "mcp47feb14",
-	.phys_channels = 4,
-	.resolution = 10,
-	.have_ext_vref1 = true,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47feb18_chip_features = {
-	.name = "mcp47feb18",
-	.phys_channels = 8,
-	.resolution = 10,
-	.have_ext_vref1 = true,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47feb21_chip_features = {
-	.name = "mcp47feb21",
-	.phys_channels = 1,
-	.resolution = 12,
-	.have_ext_vref1 = false,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47feb22_chip_features = {
-	.name = "mcp47feb22",
-	.phys_channels = 2,
-	.resolution = 12,
-	.have_ext_vref1 = false,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47feb24_chip_features = {
-	.name = "mcp47feb24",
-	.phys_channels = 4,
-	.resolution = 12,
-	.have_ext_vref1 = true,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47feb28_chip_features = {
-	.name = "mcp47feb28",
-	.phys_channels = 8,
-	.resolution = 12,
-	.have_ext_vref1 = true,
-	.have_eeprom = true,
-};
-
-static const struct mcp47feb02_features mcp47fvb01_chip_features = {
-	.name = "mcp47fvb01",
-	.phys_channels = 1,
-	.resolution = 8,
-	.have_ext_vref1 = false,
-	.have_eeprom = false,
-};
-
-static const struct mcp47feb02_features mcp47fvb02_chip_features = {
-	.name = "mcp47fvb02",
-	.phys_channels = 2,
-	.resolution = 8,
-	.have_ext_vref1 = false,
-	.have_eeprom = false,
-};
-
-static const struct mcp47feb02_features mcp47fvb04_chip_features = {
-	.name = "mcp47fvb04",
-	.phys_channels = 4,
-	.resolution = 8,
-	.have_ext_vref1 = true,
-	.have_eeprom = false,
-};
-
-static const struct mcp47feb02_features mcp47fvb08_chip_features = {
-	.name = "mcp47fvb08",
-	.phys_channels = 8,
-	.resolution = 8,
-	.have_ext_vref1 = true,
-	.have_eeprom = false,
-};
-
-static const struct mcp47feb02_features mcp47fvb11_chip_features = {
-	.name = "mcp47fvb11",
-	.phys_channels = 1,
-	.resolution = 10,
-	.have_ext_vref1 = false,
-	.have_eeprom = false,
-};
-
-static const struct mcp47feb02_features mcp47fvb12_chip_features = {
-	.name = "mcp47fvb12",
-	.phys_channels = 2,
-	.resolution = 10,
-	.have_ext_vref1 = false,
-	.have_eeprom = false,
-};
-
-static const struct mcp47feb02_features mcp47fvb14_chip_features = {
-	.name = "mcp47fvb14",
-	.phys_channels = 4,
-	.resolution = 10,
-	.have_ext_vref1 = true,
-	.have_eeprom = false,
-};
-
-static const struct mcp47feb02_features mcp47fvb18_chip_features = {
-	.name = "mcp47fvb18",
-	.phys_channels = 8,
-	.resolution = 10,
-	.have_ext_vref1 = true,
-	.have_eeprom = false,
-};
-
-static const struct mcp47feb02_features mcp47fvb21_chip_features = {
-	.name = "mcp47fvb21",
-	.phys_channels = 1,
-	.resolution = 12,
-	.have_ext_vref1 = false,
-	.have_eeprom = false,
-};
-
-static const struct mcp47feb02_features mcp47fvb22_chip_features = {
-	.name = "mcp47fvb22",
-	.phys_channels = 2,
-	.resolution = 12,
-	.have_ext_vref1 = false,
-	.have_eeprom = false,
-};
-
-static const struct mcp47feb02_features mcp47fvb24_chip_features = {
-	.name = "mcp47fvb24",
-	.phys_channels = 4,
-	.resolution = 12,
-	.have_ext_vref1 = true,
-	.have_eeprom = false,
-};
-
-static const struct mcp47feb02_features mcp47fvb28_chip_features = {
-	.name = "mcp47fvb28",
-	.phys_channels = 8,
-	.resolution = 12,
-	.have_ext_vref1 = true,
-	.have_eeprom = false,
-};
-
 /**
  * struct mcp47feb02_channel_data - channel configuration
  * @ref_mode: chosen voltage for reference
@@ -379,7 +172,7 @@ static const struct regmap_access_table mcp47feb02_volatile_table = {
 	.n_yes_ranges = ARRAY_SIZE(mcp47feb02_volatile_ranges),
 };
 
-static const struct regmap_config mcp47feb02_regmap_config = {
+const struct regmap_config mcp47feb02_regmap_config = {
 	.name = "mcp47feb02_regmap",
 	.reg_bits = 8,
 	.val_bits = 16,
@@ -391,6 +184,7 @@ static const struct regmap_config mcp47feb02_regmap_config = {
 	.cache_type = REGCACHE_MAPLE,
 	.val_format_endian = REGMAP_ENDIAN_BIG,
 };
+EXPORT_SYMBOL_NS_GPL(mcp47feb02_regmap_config, "IIO_MCP47FEB02");
 
 /* For devices that doesn't have nonvolatile memory */
 static const struct regmap_range mcp47fvb02_readable_ranges[] = {
@@ -421,7 +215,7 @@ static const struct regmap_access_table mcp47fvb02_volatile_table = {
 	.n_yes_ranges = ARRAY_SIZE(mcp47fvb02_volatile_ranges),
 };
 
-static const struct regmap_config mcp47fvb02_regmap_config = {
+const struct regmap_config mcp47fvb02_regmap_config = {
 	.name = "mcp47fvb02_regmap",
 	.reg_bits = 8,
 	.val_bits = 16,
@@ -433,6 +227,7 @@ static const struct regmap_config mcp47fvb02_regmap_config = {
 	.cache_type = REGCACHE_MAPLE,
 	.val_format_endian = REGMAP_ENDIAN_BIG,
 };
+EXPORT_SYMBOL_NS_GPL(mcp47fvb02_regmap_config, "IIO_MCP47FEB02");
 
 static int mcp47feb02_write_to_eeprom(struct mcp47feb02_data *data, unsigned int reg,
 				      unsigned int val)
@@ -443,8 +238,6 @@ static int mcp47feb02_write_to_eeprom(struct mcp47feb02_data *data, unsigned int
 	 * Wait until the currently occurring EEPROM Write Cycle is completed.
 	 * Only serial commands to the volatile memory are allowed.
 	 */
-	guard(mutex)(&data->lock);
-
 	ret = regmap_read_poll_timeout(data->regmap, MCP47FEB02_GAIN_CTRL_STATUS_REG_ADDR,
 				       eewa_val,
 				       !(eewa_val & MCP47FEB02_GAIN_BIT_STATUS_EEWA_MASK),
@@ -470,6 +263,8 @@ static ssize_t store_eeprom_store(struct device *dev, struct device_attribute *a
 	if (!state)
 		return len;
 
+	guard(mutex)(&data->lock);
+
 	/*
 	 * Verify DAC Wiper and DAC Configuration are unlocked. If both are disabled,
 	 * writing to EEPROM is available.
@@ -577,11 +372,9 @@ static int mcp47feb02_resume(struct device *dev)
 	guard(mutex)(&data->lock);
 
 	for_each_set_bit(ch, &data->active_channels_mask, data->phys_channels) {
-		u8 pd_mode;
 		int ret;
 
 		data->chdata[ch].powerdown = false;
-		pd_mode = data->chdata[ch].powerdown_mode + 1;
 
 		ret = regmap_write(data->regmap, REG_ADDR(ch), data->chdata[ch].dac_data);
 		if (ret)
@@ -589,7 +382,8 @@ static int mcp47feb02_resume(struct device *dev)
 
 		ret = regmap_update_bits(data->regmap, MCP47FEB02_VREF_REG_ADDR,
 					 MCP47FEB02_VREF_PD_MASK(ch),
-					 MCP47FEB02_VREF_PD_VAL(ch, pd_mode));
+					 MCP47FEB02_VREF_PD_VAL(ch, data->chdata[ch].ref_mode));
+
 		if (ret)
 			return ret;
 
@@ -668,7 +462,7 @@ static ssize_t mcp47feb02_write_powerdown(struct iio_dev *indio_dev, uintptr_t p
 	return len;
 }
 
-static DEFINE_SIMPLE_DEV_PM_OPS(mcp47feb02_pm_ops, mcp47feb02_suspend, mcp47feb02_resume);
+EXPORT_SIMPLE_DEV_PM_OPS(mcp47feb02_pm_ops, mcp47feb02_suspend, mcp47feb02_resume);
 
 static const struct iio_enum mcp47febxx_powerdown_mode_enum = {
 	.items = mcp47feb02_powerdown_modes,
@@ -1099,10 +893,10 @@ static int mcp47feb02_init_ch_scales(struct mcp47feb02_data *data, int vdd_uV,
 	return 0;
 }
 
-static int mcp47feb02_probe(struct i2c_client *client)
+int mcp47feb02_common_probe(const struct mcp47feb02_features *chip_features,
+			    struct regmap *regmap)
 {
-	const struct mcp47feb02_features *chip_features;
-	struct device *dev = &client->dev;
+	struct device *dev = regmap_get_device(regmap);
 	struct mcp47feb02_data *data;
 	struct iio_dev *indio_dev;
 	int vref1_uV, vref_uV, vdd_uV, ret;
@@ -1111,22 +905,16 @@ static int mcp47feb02_probe(struct i2c_client *client)
 	if (!indio_dev)
 		return -ENOMEM;
 
-	data = iio_priv(indio_dev);
-	chip_features = i2c_get_match_data(client);
-	if (!chip_features)
-		return -EINVAL;
+	dev_set_drvdata(dev, indio_dev);
 
+	data = iio_priv(indio_dev);
 	data->chip_features = chip_features;
+	data->regmap = regmap;
 
-	if (chip_features->have_eeprom) {
-		data->regmap = devm_regmap_init_i2c(client, &mcp47feb02_regmap_config);
+	if (chip_features->have_eeprom)
 		indio_dev->info = &mcp47feb02_info;
-	} else {
-		data->regmap = devm_regmap_init_i2c(client, &mcp47fvb02_regmap_config);
+	else
 		indio_dev->info = &mcp47fvb02_info;
-	}
-	if (IS_ERR(data->regmap))
-		return dev_err_probe(dev, PTR_ERR(data->regmap), "Error initializing i2c regmap\n");
 
 	indio_dev->name = chip_features->name;
 
@@ -1183,75 +971,7 @@ static int mcp47feb02_probe(struct i2c_client *client)
 
 	return devm_iio_device_register(dev, indio_dev);
 }
-
-static const struct i2c_device_id mcp47feb02_id[] = {
-	{ .name = "mcp47feb01", .driver_data = (kernel_ulong_t)&mcp47feb01_chip_features },
-	{ .name = "mcp47feb02", .driver_data = (kernel_ulong_t)&mcp47feb02_chip_features },
-	{ .name = "mcp47feb04", .driver_data = (kernel_ulong_t)&mcp47feb04_chip_features },
-	{ .name = "mcp47feb08", .driver_data = (kernel_ulong_t)&mcp47feb08_chip_features },
-	{ .name = "mcp47feb11", .driver_data = (kernel_ulong_t)&mcp47feb11_chip_features },
-	{ .name = "mcp47feb12", .driver_data = (kernel_ulong_t)&mcp47feb12_chip_features },
-	{ .name = "mcp47feb14", .driver_data = (kernel_ulong_t)&mcp47feb14_chip_features },
-	{ .name = "mcp47feb18", .driver_data = (kernel_ulong_t)&mcp47feb18_chip_features },
-	{ .name = "mcp47feb21", .driver_data = (kernel_ulong_t)&mcp47feb21_chip_features },
-	{ .name = "mcp47feb22", .driver_data = (kernel_ulong_t)&mcp47feb22_chip_features },
-	{ .name = "mcp47feb24", .driver_data = (kernel_ulong_t)&mcp47feb24_chip_features },
-	{ .name = "mcp47feb28", .driver_data = (kernel_ulong_t)&mcp47feb28_chip_features },
-	{ .name = "mcp47fvb01", .driver_data = (kernel_ulong_t)&mcp47fvb01_chip_features },
-	{ .name = "mcp47fvb02", .driver_data = (kernel_ulong_t)&mcp47fvb02_chip_features },
-	{ .name = "mcp47fvb04", .driver_data = (kernel_ulong_t)&mcp47fvb04_chip_features },
-	{ .name = "mcp47fvb08", .driver_data = (kernel_ulong_t)&mcp47fvb08_chip_features },
-	{ .name = "mcp47fvb11", .driver_data = (kernel_ulong_t)&mcp47fvb11_chip_features },
-	{ .name = "mcp47fvb12", .driver_data = (kernel_ulong_t)&mcp47fvb12_chip_features },
-	{ .name = "mcp47fvb14", .driver_data = (kernel_ulong_t)&mcp47fvb14_chip_features },
-	{ .name = "mcp47fvb18", .driver_data = (kernel_ulong_t)&mcp47fvb18_chip_features },
-	{ .name = "mcp47fvb21", .driver_data = (kernel_ulong_t)&mcp47fvb21_chip_features },
-	{ .name = "mcp47fvb22", .driver_data = (kernel_ulong_t)&mcp47fvb22_chip_features },
-	{ .name = "mcp47fvb24", .driver_data = (kernel_ulong_t)&mcp47fvb24_chip_features },
-	{ .name = "mcp47fvb28", .driver_data = (kernel_ulong_t)&mcp47fvb28_chip_features },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, mcp47feb02_id);
-
-static const struct of_device_id mcp47feb02_of_match[] = {
-	{ .compatible = "microchip,mcp47feb01", .data = &mcp47feb01_chip_features },
-	{ .compatible = "microchip,mcp47feb02", .data = &mcp47feb02_chip_features },
-	{ .compatible = "microchip,mcp47feb04", .data = &mcp47feb04_chip_features },
-	{ .compatible = "microchip,mcp47feb08", .data = &mcp47feb08_chip_features },
-	{ .compatible = "microchip,mcp47feb11", .data = &mcp47feb11_chip_features },
-	{ .compatible = "microchip,mcp47feb12", .data = &mcp47feb12_chip_features },
-	{ .compatible = "microchip,mcp47feb14", .data = &mcp47feb14_chip_features },
-	{ .compatible = "microchip,mcp47feb18", .data = &mcp47feb18_chip_features },
-	{ .compatible = "microchip,mcp47feb21", .data = &mcp47feb21_chip_features },
-	{ .compatible = "microchip,mcp47feb22", .data = &mcp47feb22_chip_features },
-	{ .compatible = "microchip,mcp47feb24", .data = &mcp47feb24_chip_features },
-	{ .compatible = "microchip,mcp47feb28", .data = &mcp47feb28_chip_features },
-	{ .compatible = "microchip,mcp47fvb01", .data = &mcp47fvb01_chip_features },
-	{ .compatible = "microchip,mcp47fvb02", .data = &mcp47fvb02_chip_features },
-	{ .compatible = "microchip,mcp47fvb04", .data = &mcp47fvb04_chip_features },
-	{ .compatible = "microchip,mcp47fvb08", .data = &mcp47fvb08_chip_features },
-	{ .compatible = "microchip,mcp47fvb11", .data = &mcp47fvb11_chip_features },
-	{ .compatible = "microchip,mcp47fvb12", .data = &mcp47fvb12_chip_features },
-	{ .compatible = "microchip,mcp47fvb14",	.data = &mcp47fvb14_chip_features },
-	{ .compatible = "microchip,mcp47fvb18", .data = &mcp47fvb18_chip_features },
-	{ .compatible = "microchip,mcp47fvb21", .data = &mcp47fvb21_chip_features },
-	{ .compatible = "microchip,mcp47fvb22", .data = &mcp47fvb22_chip_features },
-	{ .compatible = "microchip,mcp47fvb24", .data = &mcp47fvb24_chip_features },
-	{ .compatible = "microchip,mcp47fvb28", .data = &mcp47fvb28_chip_features },
-	{ }
-};
-MODULE_DEVICE_TABLE(of, mcp47feb02_of_match);
-
-static struct i2c_driver mcp47feb02_driver = {
-	.driver = {
-		.name	= "mcp47feb02",
-		.of_match_table = mcp47feb02_of_match,
-		.pm	= pm_sleep_ptr(&mcp47feb02_pm_ops),
-	},
-	.probe		= mcp47feb02_probe,
-	.id_table	= mcp47feb02_id,
-};
-module_i2c_driver(mcp47feb02_driver);
+EXPORT_SYMBOL_NS(mcp47feb02_common_probe, "IIO_MCP47FEB02");
 
 MODULE_AUTHOR("Ariana Lazar <ariana.lazar@microchip.com>");
 MODULE_DESCRIPTION("IIO driver for MCP47FEB02 Multi-Channel DAC with I2C interface");
diff --git a/drivers/iio/dac/mcp47feb02-i2c.c b/drivers/iio/dac/mcp47feb02-i2c.c
new file mode 100644
index 0000000000000000000000000000000000000000..7ec0cccad79bc9e9e3f919209c34d0f39656a370
--- /dev/null
+++ b/drivers/iio/dac/mcp47feb02-i2c.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * IIO driver for MCP47FEB02 Multi-Channel DAC with I2C interface
+ *
+ * Copyright (C) 2025-2026 Microchip Technology Inc. and its subsidiaries
+ *
+ * Author: Ariana Lazar <ariana.lazar@microchip.com>
+ *
+ * Datasheet links for devices with I2C interface:
+ * [MCP47FEBxx] https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005375A.pdf
+ * [MCP47FVBxx] https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005405A.pdf
+ * [MCP47FxBx4/8] https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/MCP47FXBX48-Data-Sheet-DS200006368A.pdf
+ */
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+
+#include "mcp47feb02.h"
+
+/* Parts with EEPROM memory */
+MCP47FEB02_CHIP_INFO(mcp47feb01, 1, 8,  false, true);
+MCP47FEB02_CHIP_INFO(mcp47feb02, 2, 8,  false, true);
+MCP47FEB02_CHIP_INFO(mcp47feb04, 4, 8,  true,  true);
+MCP47FEB02_CHIP_INFO(mcp47feb08, 8, 8,  true,  true);
+MCP47FEB02_CHIP_INFO(mcp47feb11, 1, 10, false, true);
+MCP47FEB02_CHIP_INFO(mcp47feb12, 2, 10, false, true);
+MCP47FEB02_CHIP_INFO(mcp47feb14, 4, 10, true,  true);
+MCP47FEB02_CHIP_INFO(mcp47feb18, 8, 10, true,  true);
+MCP47FEB02_CHIP_INFO(mcp47feb21, 1, 12, false, true);
+MCP47FEB02_CHIP_INFO(mcp47feb22, 2, 12, false, true);
+MCP47FEB02_CHIP_INFO(mcp47feb24, 4, 12, true,  true);
+MCP47FEB02_CHIP_INFO(mcp47feb28, 8, 12, true,  true);
+
+/* Parts without EEPROM memory */
+MCP47FEB02_CHIP_INFO(mcp47fvb01, 1, 8,  false, false);
+MCP47FEB02_CHIP_INFO(mcp47fvb02, 2, 8,  false, false);
+MCP47FEB02_CHIP_INFO(mcp47fvb04, 4, 8,  true,  false);
+MCP47FEB02_CHIP_INFO(mcp47fvb08, 8, 8,  true,  false);
+MCP47FEB02_CHIP_INFO(mcp47fvb11, 1, 10, false, false);
+MCP47FEB02_CHIP_INFO(mcp47fvb12, 2, 10, false, false);
+MCP47FEB02_CHIP_INFO(mcp47fvb14, 4, 10, true,  false);
+MCP47FEB02_CHIP_INFO(mcp47fvb18, 8, 10, true,  false);
+MCP47FEB02_CHIP_INFO(mcp47fvb21, 1, 12, false, false);
+MCP47FEB02_CHIP_INFO(mcp47fvb22, 2, 12, false, false);
+MCP47FEB02_CHIP_INFO(mcp47fvb24, 4, 12, true,  false);
+MCP47FEB02_CHIP_INFO(mcp47fvb28, 8, 12, true,  false);
+
+static int mcp47feb02_i2c_probe(struct i2c_client *client)
+{
+	const struct mcp47feb02_features *chip_features;
+	struct device *dev = &client->dev;
+	struct regmap *regmap;
+
+	chip_features = i2c_get_match_data(client);
+	if (!chip_features)
+		return dev_err_probe(dev, -ENODATA, "No match data found\n");
+
+	if (chip_features->have_eeprom)
+		regmap = devm_regmap_init_i2c(client, &mcp47feb02_regmap_config);
+	else
+		regmap = devm_regmap_init_i2c(client, &mcp47fvb02_regmap_config);
+
+	if (IS_ERR(regmap))
+		return dev_err_probe(dev, PTR_ERR(regmap), "Error initializing I2C regmap\n");
+
+	return mcp47feb02_common_probe(chip_features, regmap);
+}
+
+static const struct i2c_device_id mcp47feb02_i2c_id[] = {
+	{ .name = "mcp47feb01", .driver_data = (kernel_ulong_t)&mcp47feb01_chip_features },
+	{ .name = "mcp47feb02", .driver_data = (kernel_ulong_t)&mcp47feb02_chip_features },
+	{ .name = "mcp47feb04", .driver_data = (kernel_ulong_t)&mcp47feb04_chip_features },
+	{ .name = "mcp47feb08", .driver_data = (kernel_ulong_t)&mcp47feb08_chip_features },
+	{ .name = "mcp47feb11", .driver_data = (kernel_ulong_t)&mcp47feb11_chip_features },
+	{ .name = "mcp47feb12", .driver_data = (kernel_ulong_t)&mcp47feb12_chip_features },
+	{ .name = "mcp47feb14", .driver_data = (kernel_ulong_t)&mcp47feb14_chip_features },
+	{ .name = "mcp47feb18", .driver_data = (kernel_ulong_t)&mcp47feb18_chip_features },
+	{ .name = "mcp47feb21", .driver_data = (kernel_ulong_t)&mcp47feb21_chip_features },
+	{ .name = "mcp47feb22", .driver_data = (kernel_ulong_t)&mcp47feb22_chip_features },
+	{ .name = "mcp47feb24", .driver_data = (kernel_ulong_t)&mcp47feb24_chip_features },
+	{ .name = "mcp47feb28", .driver_data = (kernel_ulong_t)&mcp47feb28_chip_features },
+	{ .name = "mcp47fvb01", .driver_data = (kernel_ulong_t)&mcp47fvb01_chip_features },
+	{ .name = "mcp47fvb02", .driver_data = (kernel_ulong_t)&mcp47fvb02_chip_features },
+	{ .name = "mcp47fvb04", .driver_data = (kernel_ulong_t)&mcp47fvb04_chip_features },
+	{ .name = "mcp47fvb08", .driver_data = (kernel_ulong_t)&mcp47fvb08_chip_features },
+	{ .name = "mcp47fvb11", .driver_data = (kernel_ulong_t)&mcp47fvb11_chip_features },
+	{ .name = "mcp47fvb12", .driver_data = (kernel_ulong_t)&mcp47fvb12_chip_features },
+	{ .name = "mcp47fvb14", .driver_data = (kernel_ulong_t)&mcp47fvb14_chip_features },
+	{ .name = "mcp47fvb18", .driver_data = (kernel_ulong_t)&mcp47fvb18_chip_features },
+	{ .name = "mcp47fvb21", .driver_data = (kernel_ulong_t)&mcp47fvb21_chip_features },
+	{ .name = "mcp47fvb22", .driver_data = (kernel_ulong_t)&mcp47fvb22_chip_features },
+	{ .name = "mcp47fvb24", .driver_data = (kernel_ulong_t)&mcp47fvb24_chip_features },
+	{ .name = "mcp47fvb28", .driver_data = (kernel_ulong_t)&mcp47fvb28_chip_features },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, mcp47feb02_i2c_id);
+
+static const struct of_device_id mcp47feb02_of_i2c_match[] = {
+	{ .compatible = "microchip,mcp47feb01", .data = &mcp47feb01_chip_features },
+	{ .compatible = "microchip,mcp47feb02", .data = &mcp47feb02_chip_features },
+	{ .compatible = "microchip,mcp47feb04", .data = &mcp47feb04_chip_features },
+	{ .compatible = "microchip,mcp47feb08", .data = &mcp47feb08_chip_features },
+	{ .compatible = "microchip,mcp47feb11", .data = &mcp47feb11_chip_features },
+	{ .compatible = "microchip,mcp47feb12", .data = &mcp47feb12_chip_features },
+	{ .compatible = "microchip,mcp47feb14", .data = &mcp47feb14_chip_features },
+	{ .compatible = "microchip,mcp47feb18", .data = &mcp47feb18_chip_features },
+	{ .compatible = "microchip,mcp47feb21", .data = &mcp47feb21_chip_features },
+	{ .compatible = "microchip,mcp47feb22", .data = &mcp47feb22_chip_features },
+	{ .compatible = "microchip,mcp47feb24", .data = &mcp47feb24_chip_features },
+	{ .compatible = "microchip,mcp47feb28", .data = &mcp47feb28_chip_features },
+	{ .compatible = "microchip,mcp47fvb01", .data = &mcp47fvb01_chip_features },
+	{ .compatible = "microchip,mcp47fvb02", .data = &mcp47fvb02_chip_features },
+	{ .compatible = "microchip,mcp47fvb04", .data = &mcp47fvb04_chip_features },
+	{ .compatible = "microchip,mcp47fvb08", .data = &mcp47fvb08_chip_features },
+	{ .compatible = "microchip,mcp47fvb11", .data = &mcp47fvb11_chip_features },
+	{ .compatible = "microchip,mcp47fvb12", .data = &mcp47fvb12_chip_features },
+	{ .compatible = "microchip,mcp47fvb14",	.data = &mcp47fvb14_chip_features },
+	{ .compatible = "microchip,mcp47fvb18", .data = &mcp47fvb18_chip_features },
+	{ .compatible = "microchip,mcp47fvb21", .data = &mcp47fvb21_chip_features },
+	{ .compatible = "microchip,mcp47fvb22", .data = &mcp47fvb22_chip_features },
+	{ .compatible = "microchip,mcp47fvb24", .data = &mcp47fvb24_chip_features },
+	{ .compatible = "microchip,mcp47fvb28", .data = &mcp47fvb28_chip_features },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mcp47feb02_of_i2c_match);
+
+static struct i2c_driver mcp47feb02_i2c_driver = {
+	.driver = {
+		.name = "mcp47feb02",
+		.of_match_table = mcp47feb02_of_i2c_match,
+		.pm = pm_sleep_ptr(&mcp47feb02_pm_ops),
+	},
+	.probe = mcp47feb02_i2c_probe,
+	.id_table = mcp47feb02_i2c_id,
+};
+module_i2c_driver(mcp47feb02_i2c_driver);
+
+MODULE_AUTHOR("Ariana Lazar <ariana.lazar@microchip.com>");
+MODULE_DESCRIPTION("IIO driver for MCP47FEB02 Multi-Channel DAC with I2C interface");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("IIO_MCP47FEB02");
diff --git a/drivers/iio/dac/mcp47feb02.h b/drivers/iio/dac/mcp47feb02.h
new file mode 100644
index 0000000000000000000000000000000000000000..5bcce1f9ae112c4fecc930f9927442eb93832f20
--- /dev/null
+++ b/drivers/iio/dac/mcp47feb02.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+#ifndef __DRIVERS_IIO_DAC_MCP47FEB02_H__
+#define __DRIVERS_IIO_DAC_MCP47FEB02_H__
+
+#include <linux/pm.h>
+#include <linux/types.h>
+
+extern const char * const mcp47feb02_powerdown_modes[];
+
+#define MCP47FEB02_CHIP_INFO(_name, _channels, _res, _vref1, _eeprom) \
+static const struct mcp47feb02_features _name##_chip_features = { \
+	.name = #_name, \
+	.phys_channels = _channels, \
+	.resolution = _res, \
+	.have_ext_vref1 = _vref1, \
+	.have_eeprom = _eeprom, \
+}
+
+/**
+ * struct mcp47feb02_features - chip specific data
+ * @name: device name
+ * @phys_channels: number of hardware channels
+ * @resolution: DAC resolution
+ * @have_ext_vref1: does the hardware have an the second external voltage reference?
+ * @have_eeprom: does the hardware have an internal eeprom?
+ */
+struct mcp47feb02_features {
+	const char *name;
+	unsigned int phys_channels;
+	unsigned int resolution;
+	bool have_ext_vref1;
+	bool have_eeprom;
+};
+
+extern const struct regmap_config mcp47feb02_regmap_config;
+extern const struct regmap_config mcp47fvb02_regmap_config;
+
+int mcp47feb02_common_probe(const struct mcp47feb02_features *chip_features,
+			    struct regmap *regmap);
+
+extern const struct dev_pm_ops mcp47feb02_pm_ops;
+
+#endif /* __DRIVERS_IIO_DAC_MCP47FEB02_H__ */

-- 
2.43.0

[PATCH v6 10/11] dt-bindings: iio: dac: add support for MCP48FEB02 SPI

[Ariana Lazar]

Add the SPI MCP48FxBy1/2/4/8 part numbers, the spi-max-frequency property
and a devicetree example for SPI usage to the existing binding.

Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
---
 .../bindings/iio/dac/microchip,mcp47feb02.yaml     | 221 ++++++++++++++++-----
 1 file changed, 173 insertions(+), 48 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/dac/microchip,mcp47feb02.yaml b/Documentation/devicetree/bindings/iio/dac/microchip,mcp47feb02.yaml
index d131f136bd15161666932261bcacd6d124b23ede..a86d094f0d4b54f9d9cc39fd54222f5968714668 100644
--- a/Documentation/devicetree/bindings/iio/dac/microchip,mcp47feb02.yaml
+++ b/Documentation/devicetree/bindings/iio/dac/microchip,mcp47feb02.yaml
@@ -4,58 +4,92 @@
 $id: http://devicetree.org/schemas/iio/dac/microchip,mcp47feb02.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Microchip MCP47F(E/V)B(0/1/2)(1/2/4/8) DAC with I2C Interface Families
+title: Microchip MCP4(7/8)F(E/V)B(0/1/2)(1/2/4/8) DAC with I2C/SPI Interface Families
 
 maintainers:
   - Ariana Lazar <ariana.lazar@microchip.com>
 
 description: |
-  Datasheet for MCP47FEB01, MCP47FEB11, MCP47FEB21, MCP47FEB02, MCP47FEB12,
-  MCP47FEB22 can be found here:
-    https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005375A.pdf
-  Datasheet for MCP47FVB01, MCP47FVB11, MCP47FVB21, MCP47FVB02, MCP47FVB12,
-  MCP47FVB22 can be found here:
-    https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005405A.pdf
-  Datasheet for MCP47FEB04, MCP47FEB14, MCP47FEB24, MCP47FEB08, MCP47FEB18,
-  MCP47FEB28, MCP47FVB04, MCP47FVB14, MCP47FVB24, MCP47FVB08, MCP47FVB18,
-  MCP47FVB28 can be found here:
-    https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/MCP47FXBX48-Data-Sheet-DS200006368A.pdf
-
-  +------------+--------------+-------------+-------------+------------+
-  | Device     |  Resolution  |   Channels  | Vref number | Memory     |
-  |------------|--------------|-------------|-------------|------------|
-  | MCP47FEB01 |     8-bit    |      1      |      1      |   EEPROM   |
-  | MCP47FEB11 |    10-bit    |      1      |      1      |   EEPROM   |
-  | MCP47FEB21 |    12-bit    |      1      |      1      |   EEPROM   |
-  |------------|--------------|-------------|-------------|------------|
-  | MCP47FEB02 |     8-bit    |      2      |      1      |   EEPROM   |
-  | MCP47FEB12 |    10-bit    |      2      |      1      |   EEPROM   |
-  | MCP47FEB22 |    12-bit    |      2      |      1      |   EEPROM   |
-  |------------|--------------|-------------|-------------|------------|
-  | MCP47FVB01 |     8-bit    |      1      |      1      |      RAM   |
-  | MCP47FVB11 |    10-bit    |      1      |      1      |      RAM   |
-  | MCP47FVB21 |    12-bit    |      1      |      1      |      RAM   |
-  |------------|--------------|-------------|-------------|------------|
-  | MCP47FVB02 |     8-bit    |      2      |      1      |      RAM   |
-  | MCP47FVB12 |    10-bit    |      2      |      1      |      RAM   |
-  | MCP47FVB22 |    12-bit    |      2      |      1      |      RAM   |
-  |------------|--------------|-------------|-------------|------------|
-  | MCP47FVB04 |     8-bit    |      4      |      2      |      RAM   |
-  | MCP47FVB14 |    10-bit    |      4      |      2      |      RAM   |
-  | MCP47FVB24 |    12-bit    |      4      |      2      |      RAM   |
-  |------------|--------------|-------------|-------------|------------|
-  | MCP47FVB08 |     8-bit    |      8      |      2      |      RAM   |
-  | MCP47FVB18 |    10-bit    |      8      |      2      |      RAM   |
-  | MCP47FVB28 |    12-bit    |      8      |      2      |      RAM   |
-  |------------|--------------|-------------|-------------|------------|
-  | MCP47FEB04 |     8-bit    |      4      |      2      |   EEPROM   |
-  | MCP47FEB14 |    10-bit    |      4      |      2      |   EEPROM   |
-  | MCP47FEB24 |    12-bit    |      4      |      2      |   EEPROM   |
-  |------------|--------------|-------------|-------------|------------|
-  | MCP47FEB08 |     8-bit    |      8      |      2      |   EEPROM   |
-  | MCP47FEB18 |    10-bit    |      8      |      2      |   EEPROM   |
-  | MCP47FEB28 |    12-bit    |      8      |      2      |   EEPROM   |
-  +------------+--------------+-------------+-------------+------------+
+  Datasheets for MCP47F(E/V)B(0/1/2)(1/2/4/8) DAC with I2C Interface Families:
+   Datasheet for MCP47FEB01, MCP47FEB02, MCP47FEB11, MCP47FEB12, MCP47FEB21,
+   MCP47FEB22 can be found here:
+     https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005375A.pdf
+   Datasheet for MCP47FVB01, MCP47FVB02, MCP47FVB11, MCP47FVB12, MCP47FVB21,
+   MCP47FVB22 can be found here:
+     https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005405A.pdf
+   Datasheet for MCP47FEB04, MCP47FEB08, MCP47FEB14, MCP47FEB18, MCP47FEB24,
+   MCP47FEB28, MCP47FVB04, MCP47FVB08, MCP47FVB14, MCP47FVB18, MCP47FVB24,
+   MCP47FVB28 can be found here:
+     https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/MCP47FXBX48-Data-Sheet-DS200006368A.pdf
+   Datasheets for MCP48F(E/V)B(0/1/2)(1/2/4/8) DAC with SPI Interface Families:
+   Datasheet for MCP48FEB01, MCP48FEB02, MCP48FEB11, MCP48FEB12, MCP48FEB21,
+   MCP48FEB22 can be found here:
+     https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005429B.pdf
+   Datasheet for MCP48FVB01, MCP48FVB02, MCP48FVB11, MCP48FVB12, MCP48FVB21,
+   MCP48FVB22 can be found here:
+     https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005466A.pdf
+   Datasheet for MCP48FEB04, MCP48FEB14, MCP48FEB24, MCP48FEB08, MCP48FEB18,
+   MCP48FEB28, MCP48FVB04, MCP48FVB14, MCP48FVB24, MCP48FVB08, MCP48FVB18,
+   MCP48FVB28 can be found here:
+     https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/MCP48FXBX4-8-Family-Data-Sheet-DS20006362A.pdf
+
+  +------------+--------------+-------------+-------------+------------+------------+
+  | Device     |  Resolution  |   Channels  | Vref number |   Memory   | Interface  |
+  |------------|--------------|-------------|-------------|------------|------------|
+  | MCP47FEB01 |              |      1      |      1      |   EEPROM   |    I2C     |
+  | MCP47FEB02 |              |      2      |      1      |   EEPROM   |    I2C     |
+  | MCP47FEB04 |              |      4      |      2      |   EEPROM   |    I2C     |
+  | MCP47FEB08 |     8-bit    |      8      |      2      |   EEPROM   |    I2C     |
+  | MCP48FEB01 |              |      1      |      1      |   EEPROM   |    SPI     |
+  | MCP48FEB02 |              |      2      |      1      |   EEPROM   |    SPI     |
+  | MCP48FEB04 |              |      4      |      2      |   EEPROM   |    SPI     |
+  | MCP48FEB08 |              |      8      |      2      |   EEPROM   |    SPI     |
+  |------------|--------------|-------------|-------------|------------|------------|
+  | MCP47FEB11 |              |      1      |      1      |   EEPROM   |    I2C     |
+  | MCP47FEB12 |              |      2      |      1      |   EEPROM   |    I2C     |
+  | MCP47FEB14 |              |      4      |      2      |   EEPROM   |    I2C     |
+  | MCP47FEB18 |    10-bit    |      8      |      2      |   EEPROM   |    I2C     |
+  | MCP48FEB11 |              |      1      |      1      |   EEPROM   |    SPI     |
+  | MCP48FEB12 |              |      2      |      1      |   EEPROM   |    SPI     |
+  | MCP48FEB14 |              |      4      |      2      |   EEPROM   |    SPI     |
+  | MCP48FEB18 |              |      8      |      2      |   EEPROM   |    SPI     |
+  |------------|--------------|-------------|-------------|------------|------------|
+  | MCP47FEB21 |              |      1      |      1      |   EEPROM   |    I2C     |
+  | MCP47FEB22 |              |      2      |      1      |   EEPROM   |    I2C     |
+  | MCP47FEB24 |              |      4      |      2      |   EEPROM   |    I2C     |
+  | MCP47FEB28 |    12-bit    |      8      |      2      |   EEPROM   |    I2C     |
+  | MCP48FEB21 |              |      1      |      1      |   EEPROM   |    SPI     |
+  | MCP48FEB22 |              |      2      |      1      |   EEPROM   |    SPI     |
+  | MCP48FEB24 |              |      4      |      2      |   EEPROM   |    SPI     |
+  | MCP48FEB28 |              |      8      |      2      |   EEPROM   |    SPI     |
+  |------------|--------------|-------------|-------------|------------|------------|
+  | MCP47FVB01 |              |      1      |      1      |   RAM      |    I2C     |
+  | MCP47FVB02 |              |      2      |      1      |   RAM      |    I2C     |
+  | MCP47FVB04 |              |      4      |      2      |   RAM      |    I2C     |
+  | MCP47FVB08 |     8-bit    |      8      |      2      |   RAM      |    I2C     |
+  | MCP48FVB01 |              |      1      |      1      |   RAM      |    SPI     |
+  | MCP48FVB02 |              |      2      |      1      |   RAM      |    SPI     |
+  | MCP48FVB04 |              |      4      |      2      |   RAM      |    SPI     |
+  | MCP48FVB08 |              |      8      |      2      |   RAM      |    SPI     |
+  |------------|--------------|-------------|-------------|------------|------------|
+  | MCP47FVB11 |              |      1      |      1      |   RAM      |    I2C     |
+  | MCP47FVB12 |              |      2      |      1      |   RAM      |    I2C     |
+  | MCP47FVB14 |              |      4      |      2      |   RAM      |    I2C     |
+  | MCP47FVB18 |    10-bit    |      8      |      2      |   RAM      |    I2C     |
+  | MCP48FVB11 |              |      1      |      1      |   RAM      |    SPI     |
+  | MCP48FVB12 |              |      2      |      1      |   RAM      |    SPI     |
+  | MCP48FVB14 |              |      4      |      2      |   RAM      |    SPI     |
+  | MCP48FVB18 |              |      8      |      2      |   RAM      |    SPI     |
+  |------------|--------------|-------------|-------------|------------|------------|
+  | MCP47FVB21 |              |      1      |      1      |   RAM      |    I2C     |
+  | MCP47FVB22 |              |      2      |      1      |   RAM      |    I2C     |
+  | MCP47FVB24 |              |      4      |      2      |   RAM      |    I2C     |
+  | MCP47FVB28 |    12-bit    |      8      |      2      |   RAM      |    I2C     |
+  | MCP48FVB21 |              |      1      |      1      |   RAM      |    SPI     |
+  | MCP48FVB22 |              |      2      |      1      |   RAM      |    SPI     |
+  | MCP48FVB24 |              |      4      |      2      |   RAM      |    SPI     |
+  | MCP48FVB28 |              |      8      |      2      |   RAM      |    SPI     |
+  +------------+--------------+-------------+-------------+------------+------------+
 
 properties:
   compatible:
@@ -84,10 +118,37 @@ properties:
       - microchip,mcp47feb08
       - microchip,mcp47feb18
       - microchip,mcp47feb28
+      - microchip,mcp48feb01
+      - microchip,mcp48feb02
+      - microchip,mcp48feb04
+      - microchip,mcp48feb08
+      - microchip,mcp48feb11
+      - microchip,mcp48feb12
+      - microchip,mcp48feb14
+      - microchip,mcp48feb18
+      - microchip,mcp48feb21
+      - microchip,mcp48feb22
+      - microchip,mcp48feb24
+      - microchip,mcp48feb28
+      - microchip,mcp48fvb01
+      - microchip,mcp48fvb02
+      - microchip,mcp48fvb04
+      - microchip,mcp48fvb08
+      - microchip,mcp48fvb11
+      - microchip,mcp48fvb12
+      - microchip,mcp48fvb14
+      - microchip,mcp48fvb18
+      - microchip,mcp48fvb21
+      - microchip,mcp48fvb22
+      - microchip,mcp48fvb24
+      - microchip,mcp48fvb28
 
   reg:
     maxItems: 1
 
+  spi-max-frequency:
+    maximum: 10000000
+
   "#address-cells":
     const: 1
 
@@ -178,6 +239,21 @@ required:
   - vdd-supply
 
 allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            pattern: "^microchip,mcp48f[ev]b[0-2][1248]$"
+    then:
+      $ref: /schemas/spi/spi-peripheral-props.yaml#
+      dependencies:
+        spi-cpha: [ spi-cpol ]
+        spi-cpol: [ spi-cpha ]
+    else:
+      properties:
+        spi-max-frequency: false
+        spi-cpha: false
+        spi-cpol: false
   - if:
       properties:
         compatible:
@@ -189,6 +265,12 @@ allOf:
               - microchip,mcp47fvb01
               - microchip,mcp47fvb11
               - microchip,mcp47fvb21
+              - microchip,mcp48feb01
+              - microchip,mcp48feb11
+              - microchip,mcp48feb21
+              - microchip,mcp48fvb01
+              - microchip,mcp48fvb11
+              - microchip,mcp48fvb21
     then:
       properties:
         lat1-gpios: false
@@ -211,6 +293,12 @@ allOf:
               - microchip,mcp47fvb02
               - microchip,mcp47fvb12
               - microchip,mcp47fvb22
+              - microchip,mcp48feb02
+              - microchip,mcp48feb12
+              - microchip,mcp48feb22
+              - microchip,mcp48fvb02
+              - microchip,mcp48fvb12
+              - microchip,mcp48fvb22
     then:
       properties:
         lat1-gpios: false
@@ -233,6 +321,12 @@ allOf:
               - microchip,mcp47feb04
               - microchip,mcp47feb14
               - microchip,mcp47feb24
+              - microchip,mcp48feb04
+              - microchip,mcp48feb14
+              - microchip,mcp48feb24
+              - microchip,mcp48fvb04
+              - microchip,mcp48fvb14
+              - microchip,mcp48fvb24
     then:
       patternProperties:
         "^channel@[0-3]$":
@@ -251,6 +345,12 @@ allOf:
               - microchip,mcp47feb08
               - microchip,mcp47feb18
               - microchip,mcp47feb28
+              - microchip,mcp48feb08
+              - microchip,mcp48feb18
+              - microchip,mcp48feb28
+              - microchip,mcp48fvb08
+              - microchip,mcp48fvb18
+              - microchip,mcp48fvb28
     then:
       patternProperties:
         "^channel@[0-7]$":
@@ -272,7 +372,7 @@ allOf:
       properties:
         microchip,vref1-buffered: false
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |
@@ -299,4 +399,29 @@ examples:
             };
         };
     };
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        dac@0 {
+          compatible = "microchip,mcp48feb02";
+          reg = <0x0>;
+          vdd-supply = <&vdac_vdd>;
+          vref-supply = <&vref_reg>;
+          spi-max-frequency = <10000000>;
+
+          #address-cells = <1>;
+          #size-cells = <0>;
+          channel@0 {
+            reg = <0>;
+            label = "Adjustable_voltage_ch0";
+          };
+
+          channel@1 {
+            reg = <0x1>;
+            label = "Adjustable_voltage_ch1";
+          };
+        };
+    };
 ...

-- 
2.43.0

[PATCH v6 11/11] iio: dac: add support for Microchip MCP48FEB02

[Ariana Lazar]

This is the IIO driver for Microchip MCP48FxBy1/2/4/8 series of buffered
voltage output Digital-to-Analog Converters with nonvolatile or volatile
memory and an SPI Interface.

The families support up to 8 output channels.

The devices can be 8-bit, 10-bit and 12-bit.

Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
 drivers/iio/dac/Kconfig          |  23 +++++++
 drivers/iio/dac/Makefile         |   1 +
 drivers/iio/dac/mcp47feb02-spi.c | 145 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 169 insertions(+)

diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index c99c32b229fb683d6407f30682f7ea6104984421..3e37db1f772a2ccf9c872d7e128766f342e13d6f 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -618,6 +618,29 @@ config MCP47FEB02_I2C
 	  will be called mcp47feb02_i2c and you will also get
 	  mcp47feb02_core for the core module.
 
+config MCP47FEB02_SPI
+	tristate "MCP48F(E/V)B01/02/04/08/11/12/14/18/21/22/24/28 SPI DAC driver"
+	depends on SPI
+	select REGMAP_SPI
+	select MCP47FEB02
+	help
+	  Say yes here if you want to build the driver for the Microchip:
+	  - 8-bit DAC:
+	    MCP48FEB01, MCP48FEB02, MCP48FEB04, MCP48FEB08,
+	    MCP48FVB01, MCP48FVB02, MCP48FVB04, MCP48FVB08
+	  - 10-bit DAC:
+	    MCP48FEB11, MCP48FEB12, MCP48FEB14, MCP48FEB18,
+	    MCP48FVB11, MCP48FVB12, MCP48FVB14, MCP48FVB18
+	  - 12-bit DAC:
+	    MCP48FEB21, MCP48FEB22, MCP48FEB24, MCP48FEB28,
+	    MCP48FVB21, MCP48FVB22, MCP48FVB24, MCP48FVB28
+	  having 1 to 8 channels, 8/10/12-bit digital-to-analog converter
+	  (DAC) with SPI interface.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called mcp47feb02_spi and you will also get
+	  mcp47feb02_core for the core module.
+
 config MCP4821
 	tristate "MCP4801/02/11/12/21/22 DAC driver"
 	depends on SPI
diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
index 6377a9c42d983f615a0aa4d36a0c3d3639c62951..b665ff638cdc6e6e8ee32521c9c12a9e3d192eef 100644
--- a/drivers/iio/dac/Makefile
+++ b/drivers/iio/dac/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_MCP4728) += mcp4728.o
 obj-$(CONFIG_MCP47A1) += mcp47a1.o
 obj-$(CONFIG_MCP47FEB02) += mcp47feb02-core.o
 obj-$(CONFIG_MCP47FEB02_I2C) += mcp47feb02-i2c.o
+obj-$(CONFIG_MCP47FEB02_SPI) += mcp47feb02-spi.o
 obj-$(CONFIG_MCP4821) += mcp4821.o
 obj-$(CONFIG_MCP4922) += mcp4922.o
 obj-$(CONFIG_STM32_DAC_CORE) += stm32-dac-core.o
diff --git a/drivers/iio/dac/mcp47feb02-spi.c b/drivers/iio/dac/mcp47feb02-spi.c
new file mode 100644
index 0000000000000000000000000000000000000000..974f8fe1b86e939e99e6b2a7d3d05f025a73aa67
--- /dev/null
+++ b/drivers/iio/dac/mcp47feb02-spi.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * IIO driver for MCP48FEB02 Multi-Channel DAC with SPI interface
+ *
+ * Copyright (C) 2025-2026 Microchip Technology Inc. and its subsidiaries
+ *
+ * Author: Ariana Lazar <ariana.lazar@microchip.com>
+ *
+ * Datasheet links for devices with SPI interface:
+ * [MCP48FEBxx] https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005429B.pdf
+ * [MCP48FVBxx] https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005466A.pdf
+ * [MCP48FxBx4/8] https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/MCP48FXBX4-8-Family-Data-Sheet-DS20006362A.pdf
+ */
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <linux/types.h>
+
+#include "mcp47feb02.h"
+
+/* Parts with EEPROM memory */
+MCP47FEB02_CHIP_INFO(mcp48feb01, 1, 8,  false, true);
+MCP47FEB02_CHIP_INFO(mcp48feb02, 2, 8,  false, true);
+MCP47FEB02_CHIP_INFO(mcp48feb04, 4, 8,  true,  true);
+MCP47FEB02_CHIP_INFO(mcp48feb08, 8, 8,  true,  true);
+MCP47FEB02_CHIP_INFO(mcp48feb11, 1, 10, false, true);
+MCP47FEB02_CHIP_INFO(mcp48feb12, 2, 10, false, true);
+MCP47FEB02_CHIP_INFO(mcp48feb14, 4, 10, true,  true);
+MCP47FEB02_CHIP_INFO(mcp48feb18, 8, 10, true,  true);
+MCP47FEB02_CHIP_INFO(mcp48feb21, 1, 12, false, true);
+MCP47FEB02_CHIP_INFO(mcp48feb22, 2, 12, false, true);
+MCP47FEB02_CHIP_INFO(mcp48feb24, 4, 12, true,  true);
+MCP47FEB02_CHIP_INFO(mcp48feb28, 8, 12, true,  true);
+
+/* Parts without EEPROM memory */
+MCP47FEB02_CHIP_INFO(mcp48fvb01, 1, 8,  false, false);
+MCP47FEB02_CHIP_INFO(mcp48fvb02, 2, 8,  false, false);
+MCP47FEB02_CHIP_INFO(mcp48fvb04, 4, 8,  true,  false);
+MCP47FEB02_CHIP_INFO(mcp48fvb08, 8, 8,  true,  false);
+MCP47FEB02_CHIP_INFO(mcp48fvb11, 1, 10, false, false);
+MCP47FEB02_CHIP_INFO(mcp48fvb12, 2, 10, false, false);
+MCP47FEB02_CHIP_INFO(mcp48fvb14, 4, 10, true,  false);
+MCP47FEB02_CHIP_INFO(mcp48fvb18, 8, 10, true,  false);
+MCP47FEB02_CHIP_INFO(mcp48fvb21, 1, 12, false, false);
+MCP47FEB02_CHIP_INFO(mcp48fvb22, 2, 12, false, false);
+MCP47FEB02_CHIP_INFO(mcp48fvb24, 4, 12, true,  false);
+MCP47FEB02_CHIP_INFO(mcp48fvb28, 8, 12, true,  false);
+
+static int mcp47feb02_spi_probe(struct spi_device *spi)
+{
+	const struct mcp47feb02_features *chip_features;
+	struct device *dev = &spi->dev;
+	struct regmap *regmap;
+
+	chip_features = spi_get_device_match_data(spi);
+	if (!chip_features)
+		return dev_err_probe(dev, -ENODATA, "No match data found\n");
+
+	if (chip_features->have_eeprom)
+		regmap = devm_regmap_init_spi(spi, &mcp47feb02_regmap_config);
+	else
+		regmap = devm_regmap_init_spi(spi, &mcp47fvb02_regmap_config);
+
+	if (IS_ERR(regmap))
+		return dev_err_probe(dev, PTR_ERR(regmap), "Error initializing SPI regmap\n");
+
+	return mcp47feb02_common_probe(chip_features, regmap);
+}
+
+static const struct spi_device_id mcp47feb02_spi_id[] = {
+	{ .name = "mcp48feb01", .driver_data = (kernel_ulong_t)&mcp48feb01_chip_features },
+	{ .name = "mcp48feb02", .driver_data = (kernel_ulong_t)&mcp48feb02_chip_features },
+	{ .name = "mcp48feb04", .driver_data = (kernel_ulong_t)&mcp48feb04_chip_features },
+	{ .name = "mcp48feb08", .driver_data = (kernel_ulong_t)&mcp48feb08_chip_features },
+	{ .name = "mcp48feb11", .driver_data = (kernel_ulong_t)&mcp48feb11_chip_features },
+	{ .name = "mcp48feb12", .driver_data = (kernel_ulong_t)&mcp48feb12_chip_features },
+	{ .name = "mcp48feb14", .driver_data = (kernel_ulong_t)&mcp48feb14_chip_features },
+	{ .name = "mcp48feb18", .driver_data =  (kernel_ulong_t)&mcp48feb18_chip_features },
+	{ .name = "mcp48feb21", .driver_data = (kernel_ulong_t)&mcp48feb21_chip_features },
+	{ .name = "mcp48feb22", .driver_data = (kernel_ulong_t)&mcp48feb22_chip_features },
+	{ .name = "mcp48feb24", .driver_data = (kernel_ulong_t)&mcp48feb24_chip_features },
+	{ .name = "mcp48feb28", .driver_data = (kernel_ulong_t)&mcp48feb28_chip_features },
+	{ .name = "mcp48fvb01", .driver_data = (kernel_ulong_t)&mcp48fvb01_chip_features },
+	{ .name = "mcp48fvb02", .driver_data = (kernel_ulong_t)&mcp48fvb02_chip_features },
+	{ .name = "mcp48fvb04", .driver_data = (kernel_ulong_t)&mcp48fvb04_chip_features },
+	{ .name = "mcp48fvb08", .driver_data = (kernel_ulong_t)&mcp48fvb08_chip_features },
+	{ .name = "mcp48fvb11", .driver_data = (kernel_ulong_t)&mcp48fvb11_chip_features },
+	{ .name = "mcp48fvb12", .driver_data = (kernel_ulong_t)&mcp48fvb12_chip_features },
+	{ .name = "mcp48fvb14", .driver_data = (kernel_ulong_t)&mcp48fvb14_chip_features },
+	{ .name = "mcp48fvb18", .driver_data = (kernel_ulong_t)&mcp48fvb18_chip_features },
+	{ .name = "mcp48fvb21", .driver_data = (kernel_ulong_t)&mcp48fvb21_chip_features },
+	{ .name = "mcp48fvb22", .driver_data = (kernel_ulong_t)&mcp48fvb22_chip_features },
+	{ .name = "mcp48fvb24", .driver_data = (kernel_ulong_t)&mcp48fvb24_chip_features },
+	{ .name = "mcp48fvb28", .driver_data = (kernel_ulong_t)&mcp48fvb28_chip_features },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, mcp47feb02_spi_id);
+
+static const struct of_device_id mcp47feb02_of_spi_match[] = {
+	{ .compatible = "microchip,mcp48feb01", .data = &mcp48feb01_chip_features },
+	{ .compatible = "microchip,mcp48feb02", .data = &mcp48feb02_chip_features },
+	{ .compatible = "microchip,mcp48feb04", .data = &mcp48feb04_chip_features },
+	{ .compatible = "microchip,mcp48feb08", .data = &mcp48feb08_chip_features },
+	{ .compatible = "microchip,mcp48feb11", .data = &mcp48feb11_chip_features },
+	{ .compatible = "microchip,mcp48feb12", .data = &mcp48feb12_chip_features },
+	{ .compatible = "microchip,mcp48feb14", .data = &mcp48feb14_chip_features },
+	{ .compatible = "microchip,mcp48feb18", .data = &mcp48feb18_chip_features },
+	{ .compatible = "microchip,mcp48feb21", .data = &mcp48feb21_chip_features },
+	{ .compatible = "microchip,mcp48feb22", .data = &mcp48feb22_chip_features },
+	{ .compatible = "microchip,mcp48feb24", .data = &mcp48feb24_chip_features },
+	{ .compatible = "microchip,mcp48feb28", .data = &mcp48feb28_chip_features },
+	{ .compatible = "microchip,mcp48fvb01", .data = &mcp48fvb01_chip_features },
+	{ .compatible = "microchip,mcp48fvb02", .data = &mcp48fvb02_chip_features },
+	{ .compatible = "microchip,mcp48fvb04", .data = &mcp48fvb04_chip_features },
+	{ .compatible = "microchip,mcp48fvb08", .data = &mcp48fvb08_chip_features },
+	{ .compatible = "microchip,mcp48fvb11", .data = &mcp48fvb11_chip_features },
+	{ .compatible = "microchip,mcp48fvb12", .data = &mcp48fvb12_chip_features },
+	{ .compatible = "microchip,mcp48fvb14",	.data = &mcp48fvb14_chip_features },
+	{ .compatible = "microchip,mcp48fvb18", .data = &mcp48fvb18_chip_features },
+	{ .compatible = "microchip,mcp48fvb21", .data = &mcp48fvb21_chip_features },
+	{ .compatible = "microchip,mcp48fvb22", .data = &mcp48fvb22_chip_features },
+	{ .compatible = "microchip,mcp48fvb24", .data = &mcp48fvb24_chip_features },
+	{ .compatible = "microchip,mcp48fvb28", .data = &mcp48fvb28_chip_features },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mcp47feb02_of_spi_match);
+
+static struct spi_driver mcp47feb02_spi_driver = {
+	.driver = {
+		.name = "mcp47feb02",
+		.of_match_table = mcp47feb02_of_spi_match,
+		.pm = pm_sleep_ptr(&mcp47feb02_pm_ops),
+	},
+	.probe = mcp47feb02_spi_probe,
+	.id_table = mcp47feb02_spi_id,
+};
+module_spi_driver(mcp47feb02_spi_driver);
+
+MODULE_AUTHOR("Ariana Lazar <ariana.lazar@microchip.com>");
+MODULE_DESCRIPTION("IIO driver for MCP48FEB02 Multi-Channel DAC with SPI interface");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("IIO_MCP47FEB02");

-- 
2.43.0

Re: [PATCH v6 03/11] iio: dac: mcp47feb02: use field_get() instead of custom dynamic macros

[Andy Shevchenko]

On Wed, Sep 16, 2026 at 05:16:29PM +0300, Ariana Lazar wrote:
> Replace manual bit operations which select channel corresponding bits
> from a control register in mcp47feb02_init_ctrl_regs() with field_get()
> macro used with masks already defined for regmap operations within the
> driver.

> Reported-by: Jonathan Cameron <jic23@kernel.org>

If it's a fix then better to add a Fixes tag, otherwise I would use Suggested-by.

> Link: https://lore.kernel.org/all/20260913224339.490d89ba@jic23-hlaptop/

Again, if it's a fix, this should be Closes:.

> Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v6 00/11] Refactor Microchip MCP47FEB02 I2C driver in separate modules to add support for MCP48FEB02 SPI driver

[Andy Shevchenko]

On Wed, Sep 16, 2026 at 05:16:26PM +0300, Ariana Lazar wrote:
> Refactor I2C driver implementation into separate modules in order to add
> support for SPI MCP48FxBy1/2/4/8 DAC family on top of the I2C
> implementation. The I2C and SPI devices have the same memory map and
> supported functionalities.
> 
> Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
> ---
> Changes in v6:
> - use field_get() in Gain, Vref and Power-Down registers channel formulas
> - rebase from 7.2 to 7.3-rc1
> - add fixes tags and Cc stable in the commit messages
> - add numeric constants in front of time defines for better readability
> - replaced dev_err() with dev_warn_probe() for missing label
> - if match data is not found at probe, return -ENODATA and a suitable
>     error message
> - Link to v5: https://lore.kernel.org/r/20260909-mcp47feb02_refactor-v5-0-8b67bcab93d1@microchip.com

My main comment against this version is the usage of Reported-by + Closes +
Fixes versus Suggested-by. Note, some of the changes doesn't look like a fix,
such as a typo in the comment, I dunno if Reported + Closes (no Fixes) is
legitimate approach there.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v6 07/11] iio: dac: mcp47feb02: correct typo from a comment

[Joshua Crofts]

On Wed, 16 Sept 2026 at 16:19, Ariana Lazar <ariana.lazar@microchip.com> wrote:
>
> Typo corrected to 'Register' in the comment regarding defined masks for the
> gain register.
>
> Reported-by: Joshua Crofts <joshua.crofts1@gmail.com>
> Link: https://lore.kernel.org/all/20260723231859.03f92ce6@systembl0wer/
> Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>

I agree with what Andy said on the cover letter, Suggested-by is better in these
cases.

--
Kind regards,
Joshua Crofts

Re: [PATCH v6 08/11] iio: dac: mcp47feb02: rename channel mask and value macros

[Jonathan Cameron]

On Wed, 16 Sep 2026 17:16:34 +0300
Ariana Lazar <ariana.lazar@microchip.com> wrote:

> Rename generic DAC_CTRL_MASK/VAL macros to MCP47FEB02_VREF_PD_MASK/VAL
> in order to clearly indicate for which control registers these channel
> masks are suitable.
> 
> Reported-by: Jonathan Cameron <jic23@kernel.org>
> Link: https://lore.kernel.org/all/20260528125140.16a8f173@jic23-huawei/
> Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
> ---
>  drivers/iio/dac/mcp47feb02.c | 23 +++++++++++++----------
>  1 file changed, 13 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/iio/dac/mcp47feb02.c b/drivers/iio/dac/mcp47feb02.c
> index 8dac4e2fb74fe4563324343ce215af3389129130..5c09ca25a75e0ecb2bfc5a2d5e62e5f7d3156810 100644
> --- a/drivers/iio/dac/mcp47feb02.c
> +++ b/drivers/iio/dac/mcp47feb02.c
> @@ -49,8 +49,8 @@
>  #define MCP47FEB02_NV_I2C_SLAVE_ADDR_MASK		GENMASK(7, 0)
>  
>  /* Voltage reference, Power-Down control register and DAC Wiperlock status register fields */
> -#define DAC_CTRL_MASK(ch)				(GENMASK(1, 0) << (2 * (ch)))
> -#define DAC_CTRL_VAL(ch, val)				((val) << (2 * (ch)))
> +#define MCP47FEB02_VREF_PD_MASK(ch)			(GENMASK(1, 0) << (2 * (ch)))
> +#define MCP47FEB02_VREF_PD_VAL(ch, val)			((val) << (2 * (ch)))
Can we drop this one...
>  
>  /* Gain Control and I2C Slave Address Register fields */
>  #define DAC_GAIN_MASK(ch)				(BIT(0) << (8 + (ch)))
> @@ -555,7 +555,8 @@ static int mcp47feb02_suspend(struct device *dev)
>  		data->chdata[ch].powerdown = true;
>  		pd_mode = data->chdata[ch].powerdown_mode + 1;
>  		ret = regmap_update_bits(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR,
> -					 DAC_CTRL_MASK(ch), DAC_CTRL_VAL(ch, pd_mode));
> +					 MCP47FEB02_VREF_PD_MASK(ch),
> +					 MCP47FEB02_VREF_PD_VAL(ch, pd_mode));
.. and here have a local for mask.

		mask = MCP47FEB02_VREF_PD_MASK(ch);
  		ret = regmap_update_bits(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR,
					 mask, field_prep(mask, pd_mode));		

Same in all the other cases. Will then match you do the field_get().


>  		if (ret)
>  			return ret;
>  
> @@ -587,7 +588,8 @@ static int mcp47feb02_resume(struct device *dev)
>  			return ret;
>  
>  		ret = regmap_update_bits(data->regmap, MCP47FEB02_VREF_REG_ADDR,
> -					 DAC_CTRL_MASK(ch), DAC_CTRL_VAL(ch, pd_mode));
> +					 MCP47FEB02_VREF_PD_MASK(ch),
> +					 MCP47FEB02_VREF_PD_VAL(ch, pd_mode));


>  		if (ret)
>  			return ret;
>  
> @@ -598,8 +600,8 @@ static int mcp47feb02_resume(struct device *dev)
>  			return ret;
>  
>  		ret = regmap_update_bits(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR,
> -					 DAC_CTRL_MASK(ch),
> -					 DAC_CTRL_VAL(ch, MCP47FEB02_NORMAL_OPERATION));
> +					 MCP47FEB02_VREF_PD_MASK(ch),
> +					 MCP47FEB02_VREF_PD_VAL(ch, MCP47FEB02_NORMAL_OPERATION));
>  		if (ret)
>  			return ret;
>  	}
> @@ -656,7 +658,8 @@ static ssize_t mcp47feb02_write_powerdown(struct iio_dev *indio_dev, uintptr_t p
>  	 */
>  	tmp_pd_mode = state ? (data->chdata[reg].powerdown_mode + 1) : MCP47FEB02_NORMAL_OPERATION;
>  	ret = regmap_update_bits(data->regmap, MCP47FEB02_POWER_DOWN_REG_ADDR,
> -				 DAC_CTRL_MASK(reg), DAC_CTRL_VAL(reg, tmp_pd_mode));
> +				 MCP47FEB02_VREF_PD_MASK(reg),
> +				 MCP47FEB02_VREF_PD_VAL(reg, tmp_pd_mode));
>  	if (ret)
>  		return ret;
>  
> @@ -822,7 +825,7 @@ static int mcp47feb02_ch_scale(struct mcp47feb02_data *data, int ch, int scale)
>  	}
>  
>  	ret = regmap_update_bits(data->regmap, MCP47FEB02_VREF_REG_ADDR,
> -				 DAC_CTRL_MASK(ch), DAC_CTRL_VAL(ch, tmp_val));
> +				 MCP47FEB02_VREF_PD_MASK(ch), MCP47FEB02_VREF_PD_VAL(ch, tmp_val));
>  	if (ret)
>  		return ret;
>  
> @@ -1027,7 +1030,7 @@ static int mcp47feb02_init_ctrl_regs(struct mcp47feb02_data *data)
>  			return ret;
>  		data->chdata[i].dac_data = dac_val;
>  
> -		data->chdata[i].ref_mode = field_get(DAC_CTRL_MASK(i), vref_ch);
> +		data->chdata[i].ref_mode = field_get(MCP47FEB02_VREF_PD_MASK(i), vref_ch);
>  		data->chdata[i].use_2x_gain = field_get(DAC_GAIN_MASK(i), gain_ch);
>  
>  		/*
> @@ -1071,7 +1074,7 @@ static int mcp47feb02_init_ctrl_regs(struct mcp47feb02_data *data)
>  			break;
>  		}
>  
> -		pd_tmp = field_get(DAC_CTRL_MASK(i), pd_ch);
> +		pd_tmp = field_get(MCP47FEB02_VREF_PD_MASK(i), pd_ch);
>  		data->chdata[i].powerdown_mode = pd_tmp ? (pd_tmp - 1) : pd_tmp;
>  		data->chdata[i].powerdown = !!(data->chdata[i].powerdown_mode);
>  	}
> 

Re: [PATCH v6 00/11] Refactor Microchip MCP47FEB02 I2C driver in separate modules to add support for MCP48FEB02 SPI driver

[Jonathan Cameron]

On Wed, 16 Sep 2026 18:26:07 +0300
Andy Shevchenko <andriy.shevchenko@intel.com> wrote:

> On Wed, Sep 16, 2026 at 05:16:26PM +0300, Ariana Lazar wrote:
> > Refactor I2C driver implementation into separate modules in order to add
> > support for SPI MCP48FxBy1/2/4/8 DAC family on top of the I2C
> > implementation. The I2C and SPI devices have the same memory map and
> > supported functionalities.
> > 
> > Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
> > ---
> > Changes in v6:
> > - use field_get() in Gain, Vref and Power-Down registers channel formulas
> > - rebase from 7.2 to 7.3-rc1
> > - add fixes tags and Cc stable in the commit messages
> > - add numeric constants in front of time defines for better readability
> > - replaced dev_err() with dev_warn_probe() for missing label
> > - if match data is not found at probe, return -ENODATA and a suitable
> >     error message
> > - Link to v5: https://lore.kernel.org/r/20260909-mcp47feb02_refactor-v5-0-8b67bcab93d1@microchip.com  
> 
> My main comment against this version is the usage of Reported-by + Closes +
> Fixes versus Suggested-by. Note, some of the changes doesn't look like a fix,
> such as a typo in the comment, I dunno if Reported + Closes (no Fixes) is
> legitimate approach there.
> 

Other than that one minor thing I raised around field_prep() I think only
need to sort out those tags.  Given that it is probably near to merge,
feel free to send a v7 a little quicker than normal. 

Jonathan