[PATCH v4 0/3] hwmon: emc1403: Convert to use OF bindings and add regulator support

[PATCH v4 0/3] hwmon: emc1403: Convert to use OF bindings and add regulator support

[Svyatoslav Ryhel]

Document, add OF and regulator support to EMC14XX thermal sensor family.

Schema file was separated from LM90 since according to Guenter Roeck[1]
these sensors are incompatible with LM90. Proposed schema has basic
hardware description. All registers Guenter Roeck mentioned may be added
later on, when/if driver would need to work with them. As for now driver
successfully works as is.

[1] https://lore.kernel.org/lkml/a0c5c1e8-9a36-4835-a5d9-7bafda79c36f@roeck-us.net/

---
Changes in v2:
- schema separated into a dedicated file
- dropped chip id check
- fixed match data casting
- adjusted regulator name

Changes in v3:
- fixed number on channels for sensors in schema

Changes in v4:
- removed redundant line
---

Jonas Schwöbel (1):
  hwmon: (emc1403) Convert to use OF bindings

Svyatoslav Ryhel (2):
  dt-bindings: hwmon: Document SMSC EMC1402/1403/1404/1428
  hwmon: (emc1403) Add regulator support

 .../bindings/hwmon/smsc,emc1403.yaml          | 203 ++++++++++++++++++
 drivers/hwmon/emc1403.c                       |  21 +-
 2 files changed, 222 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/hwmon/smsc,emc1403.yaml

-- 
2.53.0

[PATCH v4 1/3] dt-bindings: hwmon: Document SMSC EMC1402/1403/1404/1428

[Svyatoslav Ryhel]

Document the basic hardware layout of SMSC (now Microchip)
EMC1402/1403/1404/1428 thermal sensors.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 .../bindings/hwmon/smsc,emc1403.yaml          | 203 ++++++++++++++++++
 1 file changed, 203 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/smsc,emc1403.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/smsc,emc1403.yaml b/Documentation/devicetree/bindings/hwmon/smsc,emc1403.yaml
new file mode 100644
index 0000000000000..d7873a37c3295
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/smsc,emc1403.yaml
@@ -0,0 +1,203 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/smsc,emc1403.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SMSC EMC1402/1403/1404/1428 thermal sensors
+
+maintainers:
+  - Svyatoslav Ryhel <clamor95@gmail.com>
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - smsc,emc1402
+          - smsc,emc1403
+          - smsc,emc1404
+          - smsc,emc1428
+
+      - items:
+          - enum:
+              - smsc,emc1412
+              - smsc,emc1422
+              - smsc,emc1442
+          - const: smsc,emc1402
+
+      - items:
+          - enum:
+              - smsc,emc1413
+              - smsc,emc1423
+          - const: smsc,emc1403
+
+      - items:
+          - enum:
+              - smsc,emc1414
+              - smsc,emc1424
+          - const: smsc,emc1404
+
+      - items:
+          - enum:
+              - smsc,emc1438
+          - const: smsc,emc1428
+
+  interrupts:
+    items:
+      - description: Sensors "ALERT" pin output.
+
+  reg:
+    maxItems: 1
+
+  "#thermal-sensor-cells":
+    const: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  vdd-supply: true
+
+required:
+  - compatible
+  - reg
+
+patternProperties:
+  "^channel@([0-7])$":
+    type: object
+    description: Represents channels of the device and their specific configuration.
+
+    properties:
+      reg:
+        description: The channel number. 0 is local channel, 1-7 are remote channels.
+        items:
+          minimum: 0
+          maximum: 7
+
+      label:
+        description: A descriptive name for this channel, like "ambient" or "psu".
+
+    required:
+      - reg
+
+    additionalProperties: false
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - smsc,emc1402
+    then:
+      patternProperties:
+        "^channel@([0-7])$":
+          properties:
+            reg:
+              items:
+                maximum: 1
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - smsc,emc1403
+    then:
+      patternProperties:
+        "^channel@([0-7])$":
+          properties:
+            reg:
+              items:
+                maximum: 2
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - smsc,emc1404
+    then:
+      patternProperties:
+        "^channel@([0-7])$":
+          properties:
+            reg:
+              items:
+                maximum: 3
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        sensor@4c {
+            compatible = "smsc,emc1412", "smsc,emc1402";
+            reg = <0x4c>;
+
+            interrupt-parent = <&gpio>;
+            interrupts = <4 IRQ_TYPE_LEVEL_LOW>;
+
+            vdd-supply = <&vdd_3v3_sys>;
+            #thermal-sensor-cells = <1>;
+        };
+    };
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        sensor@29 {
+            compatible = "smsc,emc1428";
+            reg = <0x29>;
+
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            channel@0 {
+                reg = <0x0>;
+                label = "local";
+            };
+
+            channel@1 {
+                reg = <0x1>;
+                label = "chan1";
+            };
+
+            channel@2 {
+                reg = <0x2>;
+                label = "chan2";
+            };
+
+            channel@3 {
+                reg = <0x3>;
+                label = "chan3";
+            };
+
+            channel@4 {
+                reg = <0x4>;
+                label = "chan4";
+            };
+
+            channel@5 {
+                reg = <0x5>;
+                label = "chan5";
+            };
+
+            channel@6 {
+                reg = <0x6>;
+                label = "chan6";
+            };
+
+            channel@7 {
+                reg = <0x7>;
+                label = "chan7";
+            };
+        };
+    };
-- 
2.53.0

Re: [PATCH v4 1/3] dt-bindings: hwmon: Document SMSC EMC1402/1403/1404/1428

[Rob Herring (Arm)]

On Fri, 31 Jul 2026 14:30:05 +0300, Svyatoslav Ryhel wrote:
> Document the basic hardware layout of SMSC (now Microchip)
> EMC1402/1403/1404/1428 thermal sensors.
> 
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> ---
>  .../bindings/hwmon/smsc,emc1403.yaml          | 203 ++++++++++++++++++
>  1 file changed, 203 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/smsc,emc1403.yaml
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>

Re: [PATCH v4 1/3] dt-bindings: hwmon: Document SMSC EMC1402/1403/1404/1428

[Guenter Roeck]

On Fri, Jul 31, 2026 at 02:30:05PM +0300, Svyatoslav Ryhel wrote:
> Document the basic hardware layout of SMSC (now Microchip)
> EMC1402/1403/1404/1428 thermal sensors.
> 
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> Reviewed-by: Rob Herring (Arm) <robh@kernel.org>

Applied.

Thanks,
Guenter

[PATCH v4 2/3] hwmon: (emc1403) Convert to use OF bindings

[Svyatoslav Ryhel]

From: Jonas Schwöbel <jonasschwoebel@yahoo.de>

Add OF match compatible table to be able to use this driver with Device
Trees.

Signed-off-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 drivers/hwmon/emc1403.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c
index cd753b38709f2..8b3173da25973 100644
--- a/drivers/hwmon/emc1403.c
+++ b/drivers/hwmon/emc1403.c
@@ -659,14 +659,14 @@ static int emc1403_probe(struct i2c_client *client)
 {
 	struct thermal_data *data;
 	struct device *hwmon_dev;
-	const struct i2c_device_id *id = i2c_match_id(emc1403_idtable, client);
 
 	data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
 			    GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 
-	data->chip = id->driver_data;
+	data->chip = (uintptr_t)i2c_get_match_data(client);
+
 	data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
 	if (IS_ERR(data->regmap))
 		return PTR_ERR(data->regmap);
@@ -682,10 +682,20 @@ static const unsigned short emc1403_address_list[] = {
 	0x18, 0x1c, 0x29, 0x3c, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
 };
 
+static const struct of_device_id emc1403_of_match[] = {
+	{ .compatible = "smsc,emc1402", .data = (void *)emc1402 },
+	{ .compatible = "smsc,emc1403", .data = (void *)emc1403 },
+	{ .compatible = "smsc,emc1404", .data = (void *)emc1404 },
+	{ .compatible = "smsc,emc1428", .data = (void *)emc1428 },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, emc1403_of_match);
+
 static struct i2c_driver sensor_emc1403 = {
 	.class = I2C_CLASS_HWMON,
 	.driver = {
 		.name = "emc1403",
+		.of_match_table = emc1403_of_match,
 	},
 	.detect = emc1403_detect,
 	.probe = emc1403_probe,
-- 
2.53.0

Re: [PATCH v4 2/3] hwmon: (emc1403) Convert to use OF bindings

[Guenter Roeck]

On Fri, Jul 31, 2026 at 02:30:06PM +0300, Svyatoslav Ryhel wrote:
> From: Jonas Schwöbel <jonasschwoebel@yahoo.de>
> 
> Add OF match compatible table to be able to use this driver with Device
> Trees.
> 
> Signed-off-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
> Reviewed-by: Guenter Roeck <linux@roeck-us.net>
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

Applied.

Thanks,
Guenter

[PATCH v4 3/3] hwmon: (emc1403) Add regulator support

[Svyatoslav Ryhel]

Add support for VDD power supply for this sensor. It is required on some
devices for the sensor to start up and work properly.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 drivers/hwmon/emc1403.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c
index 8b3173da25973..a0f8d29eb6c76 100644
--- a/drivers/hwmon/emc1403.c
+++ b/drivers/hwmon/emc1403.c
@@ -18,6 +18,7 @@
 #include <linux/err.h>
 #include <linux/sysfs.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 #include <linux/util_macros.h>
 
 #define THERMAL_PID_REG		0xfd
@@ -659,6 +660,12 @@ static int emc1403_probe(struct i2c_client *client)
 {
 	struct thermal_data *data;
 	struct device *hwmon_dev;
+	int ret;
+
+	ret = devm_regulator_get_enable(&client->dev, "vdd");
+	if (ret)
+		return dev_err_probe(&client->dev, ret,
+				     "Failed to enable regulator\n");
 
 	data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
 			    GFP_KERNEL);
-- 
2.53.0

Re: [PATCH v4 3/3] hwmon: (emc1403) Add regulator support

[Guenter Roeck]

On Fri, Jul 31, 2026 at 02:30:07PM +0300, Svyatoslav Ryhel wrote:
> Add support for VDD power supply for this sensor. It is required on some
> devices for the sensor to start up and work properly.
> 
> Reviewed-by: Guenter Roeck <linux@roeck-us.net>
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

Applied.

Thanks,
Guenter