[PATCH v5 0/5] iio: pressure: dps310: add Zilltek ZTS8032

[PATCH v5 0/5] iio: pressure: dps310: add Zilltek ZTS8032

[Paulius Zaleckas]

The Zilltek ZTS8032 is a register compatible DPS310 with two more
pressure calibration coefficients (c31, c40) and a different TMP_CFG
layout. The FIFO is the same as on the DPS310.

1-2: Vendor prefix and the zilltek,zts8032 compatible.
3: Per-chip data in the I2C and ACPI match data, no functional change.
4: OF match table.
5: ZTS8032 chip data: the coefficient count, the external sensor flag,
   and a Horner step each for c40 and c31.

Based on iio/testing (43ffda3c7f84), on top of the FIFO series.

There is no public ZTS8032 datasheet.

Testing: ZTS8032 on an arm64 (MT7987) board, with dps310.c from this
series backported to 6.12. in_pressure_input matches the datasheet
formula evaluated from the raw and coefficient registers to within 1 Pa
at every oversampling rate from 1 to 128, and TMP_CFG reads 0x00 after
probe. Buffered capture without a trigger runs through the FIFO
(CFG_REG reads 0x02 while enabled, 0x00 after) and returns the same
pressure and temperature as direct reads, with pressure only and with
both channels. Every patch builds without warnings with W=1 on x86_64
and i386, dt_binding_check passes. I have no DPS310, so patches 3-4 are
untested on one.

An LLM coding assistant (Claude Code) was used for this series: it
ported the ZTS8032 support from the vendor driver, wrote the code and
changelogs and the hardware test scripts, under my direction. I
reviewed and tested the result.

Changes in v5:
- Rebase onto iio/testing with the FIFO series. The ZTS8032 FIFO is the
  same (FIFO_EN, 32 entries, FIFO_STS, RESET FIFO_FLUSH), so it needs no
  chip flag (Rupesh)
- Replace the tmp_cfg chip field with coef_for_ext_sensor and build the
  TMP_CFG startup value with FIELD_PREP() (Jonathan)
- Drop the TMP_CFG comment on the ZTS8032 chip data (Jonathan)
- Use get_unaligned_be16() for c31 and c40 (Jonathan)
- Link to v4: https://lore.kernel.org/r/20261016153533.3701000-1-paulius.zaleckas@gmail.com

Changes in v4:
- Rename DPS310_MAX_COEF_LEN to MAX_COEF_LEN, separated from the
  per-chip lengths by a blank line (Andy)
- Add Andy's and Joshua's Reviewed-by tags
- Link to v3: https://lore.kernel.org/r/20261015104945.2687162-1-paulius.zaleckas@gmail.com

Changes in v3:
- Drop v2 1/6, superseded by a22dc7ebb21a in iio/testing; rebase onto
  it and add c40 and c31 as Horner steps. This also covers the Sashiko
  overflow report on v2 1/6.
- C99 initializers for the ACPI ID (Andy, Uwe)
- Add DPS310_MAX_COEF_LEN in patch 3 and bump it in patch 5 (Andy)
- Parse c31/c40 based on a chip flag, not the coefficient count (Andy)
- List the supported sensors one per line in Kconfig (Andy)
- Link to v2: https://lore.kernel.org/r/20261013112124.1878296-1-paulius.zaleckas@gmail.com

Changes in v2:
- Split the driver patch into per-chip data, OF match table and
  ZTS8032 support (Andy)
- Drop the linux/mod_devicetable.h include (Andy, Uwe)
- Return -ENODATA when there is no match data (Andy)
- Add Conor's Acked-by to the bindings
- Link to v1: https://lore.kernel.org/r/20261012114550.1680054-1-paulius.zaleckas@ui.com

Paulius Zaleckas (5):
  dt-bindings: vendor-prefixes: Add ZillTek Technology
  dt-bindings: iio: pressure: infineon,dps310: Add Zilltek ZTS8032
  iio: pressure: dps310: add per-chip data
  iio: pressure: dps310: add an OF match table
  iio: pressure: dps310: add Zilltek ZTS8032 support

 .../iio/pressure/infineon,dps310.yaml         |  4 +-
 .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
 drivers/iio/pressure/Kconfig                  |  6 +-
 drivers/iio/pressure/dps310.c                 | 80 ++++++++++++++++---
 4 files changed, 77 insertions(+), 15 deletions(-)


base-commit: 43ffda3c7f8456bbe641ae8249a077a361b97880
-- 
2.55.0

[PATCH v5 1/5] dt-bindings: vendor-prefixes: Add ZillTek Technology

[Paulius Zaleckas]

ZillTek Technology Corp. (Hsinchu, Taiwan) makes MEMS microphones and
barometric pressure sensors such as the ZTS8032.

Link: https://www.zilltek.com/
Assisted-by: LLM
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@gmail.com>
---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 0ec4e481c64b..1d0ef2d7826f 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -1979,6 +1979,8 @@ patternProperties:
     description: Shenzhen Zidoo Technology Co., Ltd.
   "^zii,.*":
     description: Zodiac Inflight Innovations
+  "^zilltek,.*":
+    description: ZillTek Technology Corp.
   "^zinitix,.*":
     description: Zinitix Co., Ltd
   "^zkmagic,.*":
-- 
2.55.0

[PATCH v5 2/5] dt-bindings: iio: pressure: infineon,dps310: Add Zilltek ZTS8032

[Paulius Zaleckas]

The Zilltek ZTS8032 is register compatible with the DPS310, but has two
more pressure calibration coefficients and takes its temperature from a
different sensor by default, so it cannot use the DPS310 compatible as a
fallback.

Assisted-by: LLM
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@gmail.com>
---
 .../devicetree/bindings/iio/pressure/infineon,dps310.yaml     | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/iio/pressure/infineon,dps310.yaml b/Documentation/devicetree/bindings/iio/pressure/infineon,dps310.yaml
index 1912a1b0b4ba..416117dfd927 100644
--- a/Documentation/devicetree/bindings/iio/pressure/infineon,dps310.yaml
+++ b/Documentation/devicetree/bindings/iio/pressure/infineon,dps310.yaml
@@ -11,12 +11,14 @@ maintainers:
 
 description:
   The DPS310 is a barometric pressure and temperature sensor with an I2C
-  interface.
+  interface. The Zilltek ZTS8032 is register compatible with it, but has
+  additional calibration coefficients.
 
 properties:
   compatible:
     enum:
       - infineon,dps310
+      - zilltek,zts8032
 
   reg:
     maxItems: 1
-- 
2.55.0

[PATCH v5 3/5] iio: pressure: dps310: add per-chip data

[Paulius Zaleckas]

Move the coefficient count, the IIO device name and whether the
temperature coefficients are for the external sensor into a per-chip
structure, passed through the I2C and ACPI match data, and build the
TMP_CFG startup value from its fields. This prepares for the Zilltek
ZTS8032, which has two more coefficients and temperature coefficients
for the internal sensor.

No functional change.

Assisted-by: LLM
Reviewed-by: Joshua Crofts <joshua.crofts1@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@gmail.com>
---
 drivers/iio/pressure/dps310.c | 43 +++++++++++++++++++++++++++--------
 1 file changed, 33 insertions(+), 10 deletions(-)

diff --git a/drivers/iio/pressure/dps310.c b/drivers/iio/pressure/dps310.c
index 00f6be126326..bfd76f2deed9 100644
--- a/drivers/iio/pressure/dps310.c
+++ b/drivers/iio/pressure/dps310.c
@@ -9,6 +9,7 @@
  *   c0 * 0.5 + c1 * T_raw / kT °C
  */
 
+#include <linux/bitfield.h>
 #include <linux/cleanup.h>
 #include <linux/devm-helpers.h>
 #include <linux/i2c.h>
@@ -42,7 +43,9 @@
 #define  DPS310_PRS_PRC_BITS	GENMASK(3, 0)
 #define DPS310_TMP_CFG		0x07
 #define  DPS310_TMP_RATE_BITS	GENMASK(6, 4)
+#define   DPS310_TMP_RATE_1SPS	0
 #define  DPS310_TMP_PRC_BITS	GENMASK(3, 0)
+#define   DPS310_TMP_PRC_1	0
 #define  DPS310_TMP_EXT		BIT(7)
 #define DPS310_MEAS_CFG		0x08
 #define  DPS310_MEAS_CTRL_BITS	GENMASK(2, 0)
@@ -63,6 +66,9 @@
 #define  DPS310_FIFO_FLUSH	BIT(7)
 #define  DPS310_RESET_MAGIC	0x09
 #define DPS310_COEF_BASE	0x10
+#define DPS310_COEF_LEN		18
+
+#define MAX_COEF_LEN		18
 
 /* Section 4.8: 32 shared entries. Stops when full, so late drains lose data */
 #define DPS310_FIFO_DEPTH	32
@@ -99,10 +105,23 @@ static const int scale_factors[] = {
 	2088960,
 };
 
+struct dps310_chip_info {
+	const char *name;
+	bool coef_for_ext_sensor;
+	u8 coef_len;
+};
+
+static const struct dps310_chip_info dps310_chip_info = {
+	.name = "dps310",
+	.coef_for_ext_sensor = true,
+	.coef_len = DPS310_COEF_LEN,
+};
+
 struct dps310_data {
 	struct i2c_client *client;
 	struct regmap *regmap;
 	struct mutex lock;	/* Lock for sequential HW access functions */
+	const struct dps310_chip_info *info;
 
 	s32 c0, c1;
 	s32 c00, c10, c20, c30, c01, c11, c21;
@@ -179,13 +198,13 @@ static const struct iio_chan_spec dps310_channels[] = {
 static int dps310_get_coefs(struct dps310_data *data)
 {
 	int rc;
-	u8 coef[18];
+	u8 coef[MAX_COEF_LEN];
 	u32 c0, c1;
 	u32 c00, c10, c20, c30, c01, c11, c21;
 
 	/* Read all sensor calibration coefficients from the COEF registers. */
 	rc = regmap_bulk_read(data->regmap, DPS310_COEF_BASE, coef,
-			      sizeof(coef));
+			      data->info->coef_len);
 	if (rc < 0)
 		return rc;
 
@@ -281,11 +300,11 @@ static int dps310_startup(struct dps310_data *data)
 	if (rc)
 		return rc;
 
-	/*
-	 * Set up external (MEMS) temperature sensor in single sample, one
-	 * measurement per second mode
-	 */
-	rc = regmap_write(data->regmap, DPS310_TMP_CFG, DPS310_TMP_EXT);
+	rc = regmap_write(data->regmap, DPS310_TMP_CFG,
+			  FIELD_PREP(DPS310_TMP_PRC_BITS, DPS310_TMP_PRC_1) |
+			  FIELD_PREP(DPS310_TMP_RATE_BITS, DPS310_TMP_RATE_1SPS) |
+			  FIELD_PREP(DPS310_TMP_EXT,
+				     data->info->coef_for_ext_sensor));
 	if (rc)
 		return rc;
 
@@ -1347,7 +1366,11 @@ static int dps310_probe(struct i2c_client *client)
 	if (rc)
 		return rc;
 
-	iio->name = DPS310_DEV_NAME;
+	data->info = i2c_get_match_data(client);
+	if (!data->info)
+		return -ENODATA;
+
+	iio->name = data->info->name;
 	iio->channels = dps310_channels;
 	iio->num_channels = ARRAY_SIZE(dps310_channels);
 	iio->info = &dps310_info;
@@ -1394,13 +1417,13 @@ static int dps310_probe(struct i2c_client *client)
 }
 
 static const struct i2c_device_id dps310_id[] = {
-	{ .name = DPS310_DEV_NAME },
+	{ .name = "dps310", .driver_data = (kernel_ulong_t)&dps310_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, dps310_id);
 
 static const struct acpi_device_id dps310_acpi_match[] = {
-	{ .id = "IFX3100" },
+	{ .id = "IFX3100", .driver_data = (kernel_ulong_t)&dps310_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, dps310_acpi_match);
-- 
2.55.0

[PATCH v5 4/5] iio: pressure: dps310: add an OF match table

[Paulius Zaleckas]

Devicetree nodes match the driver only through the I2C ID table fallback.
Add an OF match table, so the chip data comes from the compatible and the
module autoloads from the of: modalias the I2C core reports for
devicetree devices.

Assisted-by: LLM
Reviewed-by: Joshua Crofts <joshua.crofts1@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@gmail.com>
---
 drivers/iio/pressure/dps310.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/iio/pressure/dps310.c b/drivers/iio/pressure/dps310.c
index bfd76f2deed9..999ae4ce73f7 100644
--- a/drivers/iio/pressure/dps310.c
+++ b/drivers/iio/pressure/dps310.c
@@ -1422,6 +1422,12 @@ static const struct i2c_device_id dps310_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, dps310_id);
 
+static const struct of_device_id dps310_of_match[] = {
+	{ .compatible = "infineon,dps310", .data = &dps310_chip_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, dps310_of_match);
+
 static const struct acpi_device_id dps310_acpi_match[] = {
 	{ .id = "IFX3100", .driver_data = (kernel_ulong_t)&dps310_chip_info },
 	{ }
@@ -1431,6 +1437,7 @@ MODULE_DEVICE_TABLE(acpi, dps310_acpi_match);
 static struct i2c_driver dps310_driver = {
 	.driver = {
 		.name = DPS310_DEV_NAME,
+		.of_match_table = dps310_of_match,
 		.acpi_match_table = dps310_acpi_match,
 	},
 	.probe = dps310_probe,
-- 
2.55.0

[PATCH v5 5/5] iio: pressure: dps310: add Zilltek ZTS8032 support

[Paulius Zaleckas]

The Zilltek ZTS8032 has the DPS310 register map, scale factors,
compensation and FIFO, with these differences:

- two more pressure coefficients, c31 and c40 at 0x22-0x25, adding
  c40 * Praw_sc^4 + c31 * Traw_sc * Praw_sc^3 to the polynomial
- TMP_EXT is MEAS_CFG bit 3, and the temperature coefficients are for
  the internal sensor (COEF_SRCE reads 0x06). TMP_CFG bit 7 is the top
  bit of a 4-bit TMP_RATE, so the DPS310 TMP_EXT write would select a
  25/16 Hz background rate instead of the external sensor.
- product ID 0x11 instead of 0x10, the driver does not check it

Add its chip data, reading 22 coefficient bytes and with TMP_EXT clear,
a Horner step for each of c40 and c31, and the I2C and OF IDs.

Tested on a ZTS8032 over I2C: in_pressure_input is within 1 Pa of the
datasheet formula evaluated from the raw and coefficient registers at
every oversampling rate from 1 to 128, TMP_CFG reads 0x00 after probe,
and buffered capture through the FIFO returns the same pressure and
temperature as direct reads.

Assisted-by: LLM
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@gmail.com>
---
 drivers/iio/pressure/Kconfig  |  6 ++++--
 drivers/iio/pressure/dps310.c | 32 +++++++++++++++++++++++++++++---
 2 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
index 9de63908936f..ffd072e4bb8f 100644
--- a/drivers/iio/pressure/Kconfig
+++ b/drivers/iio/pressure/Kconfig
@@ -115,8 +115,10 @@ config DPS310
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	help
-	  Support for the Infineon DPS310 digital barometric pressure sensor.
-	  It can be accessed over I2C bus.
+	  Support for the following digital barometric pressure sensors:
+	  - Infineon DPS310
+	  - Zilltek ZTS8032
+	  They can be accessed over I2C bus.
 
 	  This driver can also be built as a module.  If so, the module will be
 	  called dps310.
diff --git a/drivers/iio/pressure/dps310.c b/drivers/iio/pressure/dps310.c
index 999ae4ce73f7..a2ac8101ff31 100644
--- a/drivers/iio/pressure/dps310.c
+++ b/drivers/iio/pressure/dps310.c
@@ -5,6 +5,10 @@
  *
  * https://www.infineon.com/dgdl/?fileId=5546d462576f34750157750826c42242
  *
+ * The Zilltek ZTS8032 is register compatible, with two more pressure
+ * calibration coefficients (c31, c40) and temperature calibrated against
+ * the internal sensor.
+ *
  * Temperature calculation:
  *   c0 * 0.5 + c1 * T_raw / kT °C
  */
@@ -67,8 +71,9 @@
 #define  DPS310_RESET_MAGIC	0x09
 #define DPS310_COEF_BASE	0x10
 #define DPS310_COEF_LEN		18
+#define ZTS8032_COEF_LEN	22
 
-#define MAX_COEF_LEN		18
+#define MAX_COEF_LEN		22
 
 /* Section 4.8: 32 shared entries. Stops when full, so late drains lose data */
 #define DPS310_FIFO_DEPTH	32
@@ -109,6 +114,7 @@ struct dps310_chip_info {
 	const char *name;
 	bool coef_for_ext_sensor;
 	u8 coef_len;
+	bool has_c31_c40;
 };
 
 static const struct dps310_chip_info dps310_chip_info = {
@@ -117,6 +123,13 @@ static const struct dps310_chip_info dps310_chip_info = {
 	.coef_len = DPS310_COEF_LEN,
 };
 
+static const struct dps310_chip_info zts8032_chip_info = {
+	.name = "zts8032",
+	.coef_for_ext_sensor = false,
+	.coef_len = ZTS8032_COEF_LEN,
+	.has_c31_c40 = true,
+};
+
 struct dps310_data {
 	struct i2c_client *client;
 	struct regmap *regmap;
@@ -125,6 +138,7 @@ struct dps310_data {
 
 	s32 c0, c1;
 	s32 c00, c10, c20, c30, c01, c11, c21;
+	s32 c31, c40;
 	s32 pressure_raw;
 	s32 temp_raw;
 	bool timeout_recovery_failed;
@@ -244,6 +258,11 @@ static int dps310_get_coefs(struct dps310_data *data)
 	c30 = (coef[16] << 8) | coef[17];
 	data->c30 = sign_extend32(c30, 15);
 
+	if (data->info->has_c31_c40) {
+		data->c31 = sign_extend32(get_unaligned_be16(&coef[18]), 15);
+		data->c40 = sign_extend32(get_unaligned_be16(&coef[20]), 15);
+	}
+
 	return 0;
 }
 
@@ -745,10 +764,15 @@ static int dps310_calculate_pressure(struct dps310_data *data, int *val)
 	if (rc)
 		return rc;
 
-	/* Section 4.9.1 of the DPS310 spec, Horner form to avoid overflow */
-	if (!dps310_horner_step(&prs, data->c30, p, kp) ||
+	/*
+	 * Section 4.9.1 of the DPS310 spec, Horner form to avoid overflow.
+	 * c40 and c31 are ZTS8032 only and zero on the DPS310.
+	 */
+	if (!dps310_horner_step(&prs, data->c40, p, kp) ||
+	    !dps310_horner_step(&prs, data->c30, p, kp) ||
 	    !dps310_horner_step(&prs, data->c20, p, kp) ||
 	    !dps310_horner_step(&prs, data->c10, p, kp) ||
+	    !dps310_horner_step(&tmp, data->c31, p, kp) ||
 	    !dps310_horner_step(&tmp, data->c21, p, kp) ||
 	    !dps310_horner_step(&tmp, data->c11, p, kp) ||
 	    !dps310_horner_step(&tmp, data->c01, t, kt))
@@ -1418,12 +1442,14 @@ static int dps310_probe(struct i2c_client *client)
 
 static const struct i2c_device_id dps310_id[] = {
 	{ .name = "dps310", .driver_data = (kernel_ulong_t)&dps310_chip_info },
+	{ .name = "zts8032", .driver_data = (kernel_ulong_t)&zts8032_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, dps310_id);
 
 static const struct of_device_id dps310_of_match[] = {
 	{ .compatible = "infineon,dps310", .data = &dps310_chip_info },
+	{ .compatible = "zilltek,zts8032", .data = &zts8032_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, dps310_of_match);
-- 
2.55.0

Re: [PATCH v5 0/5] iio: pressure: dps310: add Zilltek ZTS8032

[Rupesh Majhi]

On Mon, Oct 19, 2026 at 11:36:15AM +0300, Paulius Zaleckas wrote:
> I have no DPS310, so patches 3-4 are untested on one.

Tested on a DPS310 on a BeagleBone Black, against iio/testing without
the series (dps310.c as a module on the board's 7.3-rc1 kernel). TMP_CFG
still reads 0x80 after probe, pressure is within 1 Pa of the datasheet
formula at every oversampling rate, and the buffer tests pass as before.

The board adds the sensor through sysfs, so for the OF table I also
booted each patch on QEMU rainier-bmc, which has an infineon,dps310
node. Same output as without the series.

Tested-by: Rupesh Majhi <zoone.rupert@gmail.com>