[PATCH v3 1/3] dt-bindings: hwmon: ti,tmp108: Add P3T1035,P3T2030

[PATCH v3 1/3] dt-bindings: hwmon: ti,tmp108: Add P3T1035,P3T2030

[Mayank Mahajan]

Document the NXP P3T1035 and P3T2030 compatibles in TMP108.

Signed-off-by: Mayank Mahajan <mayankmahajan.x@nxp.com>
---
V1 -> V2:
- No changes in v2.
V2 -> V3:
- Add P3T1035 fallback for P3T2030 as they are functionally identical.
- Add comment in the description explaining the use of P3T2030.

 .../devicetree/bindings/hwmon/ti,tmp108.yaml  | 24 ++++++++++++-------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/hwmon/ti,tmp108.yaml b/Documentation/devicetree/bindings/hwmon/ti,tmp108.yaml
index a6f9319e068d..1f540c623de6 100644
--- a/Documentation/devicetree/bindings/hwmon/ti,tmp108.yaml
+++ b/Documentation/devicetree/bindings/hwmon/ti,tmp108.yaml
@@ -4,27 +4,35 @@
 $id: http://devicetree.org/schemas/hwmon/ti,tmp108.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#

-title: TMP108/P3T1085(NXP) temperature sensor
+title: TMP108/P3T1035/P3T1085/P3T2030 temperature sensor

 maintainers:
   - Krzysztof Kozlowski <krzk@kernel.org>

 description: |
-  The TMP108/P3T1085(NXP) is a digital-output temperature sensor with a
-  dynamically-programmable limit window, and under- and overtemperature
-  alert functions.
+  The TMP108 or NXP P3T Family (P3T1035, P3T1085 and P3T2030) is a digital-
+  output temperature sensor with a dynamically-programmable limit window,
+  and under- and over-temperature alert functions.

-  P3T1085(NXP) support I3C.
+  NXP P3T Family (P3T1035, P3T1085 and P3T2030) supports I3C.

   Datasheets:
     https://www.ti.com/product/TMP108
     https://www.nxp.com/docs/en/data-sheet/P3T1085UK.pdf
+    https://www.nxp.com/docs/en/data-sheet/P3T1035XUK_P3T2030XUK.pdf
+
+  P3T2030 is functionally identical to P3T1035. Hence, device tree nodes that
+  use the P3T2030 must provide a fallback compatible string of "nxp,p3t1035"

 properties:
   compatible:
-    enum:
-      - nxp,p3t1085
-      - ti,tmp108
+    oneOf:
+      - items:
+          - const: nxp,p3t2030
+          - const: nxp,p3t1035
+      - const: nxp,p3t1035
+      - const: nxp,p3t1085
+      - const: ti,tmp108

   interrupts:
     items:
--
2.34.1

[PATCH v3 2/3] hwmon: (tmp108) Add support for P3T1035 and P3T2030

[Mayank Mahajan]

Add support for the P3T1035 & P3T2030 temperature sensor. While mostly
compatible with the TMP108, P3T1035 uses an 8-bit configuration register
instead of the 16-bit layout used by TMP108. Updated driver to handle
this difference during configuration read/write.

Signed-off-by: Mayank Mahajan <mayankmahajan.x@nxp.com>
---
V1 -> V2:
- Disabled hysteresis in is_visible function for P3T1035.
- Added tables for conversion rate similar to the LM75 driver.
- Implemented different bus access depending on the chip being used.
  - Removed regmap for 8 bits; now we are using one regmap as before.
  - Added read and write functions for i2c and i3c for use with regmap.
  - Mapped the 8-bit configuration register to a 16 bit value for P3T1035.
V2 -> V3:
- Remove changes not relevant to adding a new device in the driver.
- Address warnings due to incorrect usage of casting operations.
- Remove the usage of P3T2030 as it's functionally identical to P3T1035.

 drivers/hwmon/Kconfig  |   2 +-
 drivers/hwmon/tmp108.c | 227 +++++++++++++++++++++++++++++++++--------
 2 files changed, 186 insertions(+), 43 deletions(-)

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 157678b821fc..31969bddc812 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -2398,7 +2398,7 @@ config SENSORS_TMP108
 	select REGMAP_I3C if I3C
 	help
 	  If you say yes here you get support for Texas Instruments TMP108
-	  sensor chips and NXP P3T1085.
+	  sensor chips, NXP temperature sensors P3T1035, P3T1085 and P3T2030.

 	  This driver can also be built as a module. If so, the module
 	  will be called tmp108.
diff --git a/drivers/hwmon/tmp108.c b/drivers/hwmon/tmp108.c
index 60a237cbedbc..38a2203c3bd9 100644
--- a/drivers/hwmon/tmp108.c
+++ b/drivers/hwmon/tmp108.c
@@ -17,9 +17,16 @@
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
+#include <linux/util_macros.h>

 #define	DRIVER_NAME "tmp108"

+enum tmp108_hw_id {
+	P3T1035_ID,		/* For sensors p3t1035 and p3t2030 */
+	P3T1085_ID,
+	TMP108_ID,
+};
+
 #define	TMP108_REG_TEMP		0x00
 #define	TMP108_REG_CONF		0x01
 #define	TMP108_REG_TLOW		0x02
@@ -61,6 +68,7 @@
 #define TMP108_CONVRATE_1HZ		TMP108_CONF_CR0		/* Default */
 #define TMP108_CONVRATE_4HZ		TMP108_CONF_CR1
 #define TMP108_CONVRATE_16HZ		(TMP108_CONF_CR0|TMP108_CONF_CR1)
+#define TMP108_CONVRATE_SHIFT		13

 #define TMP108_CONF_HYSTERESIS_MASK	(TMP108_CONF_HYS0|TMP108_CONF_HYS1)
 #define TMP108_HYSTERESIS_0C		0x0000
@@ -71,11 +79,21 @@
 #define TMP108_CONVERSION_TIME_MS	30	/* in milli-seconds */

 struct tmp108 {
-	struct regmap *regmap;
-	u16 orig_config;
-	unsigned long ready_time;
+	struct regmap		*regmap;
+	u16			orig_config;
+	unsigned long		ready_time;
+	enum tmp108_hw_id	hw_id;
+	bool			config_reg_16bits;
+	u8			reg_buf[1];
+	u8			val_buf[3];
+	unsigned int		sample_times[4];
 };

+static const u16 tmp108_sample_set_masks[] = { 3 << TMP108_CONVRATE_SHIFT,
+					       2 << TMP108_CONVRATE_SHIFT,
+					       1 << TMP108_CONVRATE_SHIFT,
+					       0 << TMP108_CONVRATE_SHIFT };
+
 /* convert 12-bit TMP108 register value to milliCelsius */
 static inline int tmp108_temp_reg_to_mC(s16 val)
 {
@@ -94,6 +112,8 @@ static int tmp108_read(struct device *dev, enum hwmon_sensor_types type,
 	struct tmp108 *tmp108 = dev_get_drvdata(dev);
 	unsigned int regval;
 	int err, hyst;
+	u16 conv_rate;
+	u8 index;

 	if (type == hwmon_chip) {
 		if (attr == hwmon_chip_update_interval) {
@@ -101,21 +121,10 @@ static int tmp108_read(struct device *dev, enum hwmon_sensor_types type,
 					  &regval);
 			if (err < 0)
 				return err;
-			switch (regval & TMP108_CONF_CONVRATE_MASK) {
-			case TMP108_CONVRATE_0P25HZ:
-			default:
-				*temp = 4000;
-				break;
-			case TMP108_CONVRATE_1HZ:
-				*temp = 1000;
-				break;
-			case TMP108_CONVRATE_4HZ:
-				*temp = 250;
-				break;
-			case TMP108_CONVRATE_16HZ:
-				*temp = 63;
-				break;
-			}
+			conv_rate = regval & TMP108_CONF_CONVRATE_MASK;
+			index = find_closest_descending(conv_rate, tmp108_sample_set_masks,
+							(int)ARRAY_SIZE(tmp108_sample_set_masks));
+			*temp = tmp108->sample_times[index];
 			return 0;
 		}
 		return -EOPNOTSUPP;
@@ -192,22 +201,17 @@ static int tmp108_write(struct device *dev, enum hwmon_sensor_types type,
 {
 	struct tmp108 *tmp108 = dev_get_drvdata(dev);
 	u32 regval, mask;
+	u8 index;
 	int err;

 	if (type == hwmon_chip) {
 		if (attr == hwmon_chip_update_interval) {
-			if (temp < 156)
-				mask = TMP108_CONVRATE_16HZ;
-			else if (temp < 625)
-				mask = TMP108_CONVRATE_4HZ;
-			else if (temp < 2500)
-				mask = TMP108_CONVRATE_1HZ;
-			else
-				mask = TMP108_CONVRATE_0P25HZ;
+			index = find_closest(temp, tmp108->sample_times,
+					     (int)ARRAY_SIZE(tmp108->sample_times));
 			return regmap_update_bits(tmp108->regmap,
 						  TMP108_REG_CONF,
 						  TMP108_CONF_CONVRATE_MASK,
-						  mask);
+						  tmp108_sample_set_masks[index]);
 		}
 		return -EOPNOTSUPP;
 	}
@@ -251,6 +255,8 @@ static int tmp108_write(struct device *dev, enum hwmon_sensor_types type,
 static umode_t tmp108_is_visible(const void *data, enum hwmon_sensor_types type,
 				 u32 attr, int channel)
 {
+	const struct tmp108 *tmp108 = data;
+
 	if (type == hwmon_chip && attr == hwmon_chip_update_interval)
 		return 0644;

@@ -264,8 +270,11 @@ static umode_t tmp108_is_visible(const void *data, enum hwmon_sensor_types type,
 		return 0444;
 	case hwmon_temp_min:
 	case hwmon_temp_max:
+		return 0644;
 	case hwmon_temp_min_hyst:
 	case hwmon_temp_max_hyst:
+		if (tmp108->hw_id == P3T1035_ID)
+			return 0;
 		return 0644;
 	default:
 		return 0;
@@ -311,6 +320,105 @@ static bool tmp108_is_volatile_reg(struct device *dev, unsigned int reg)
 	return reg == TMP108_REG_TEMP || reg == TMP108_REG_CONF;
 }

+static int tmp108_i2c_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	struct i2c_client *client = context;
+	struct tmp108 *tmp108 = i2c_get_clientdata(client);
+	int ret;
+
+	if (reg == TMP108_REG_CONF && !tmp108->config_reg_16bits)
+		ret = i2c_smbus_read_byte_data(client, TMP108_REG_CONF);
+	else
+		ret = i2c_smbus_read_word_swapped(client, reg);
+
+	if (ret < 0)
+		return ret;
+
+	if (reg == TMP108_REG_CONF && !tmp108->config_reg_16bits)
+		*val = ret << 8;
+	else
+		*val = ret;
+
+	return 0;
+}
+
+static int tmp108_i2c_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	struct i2c_client *client = context;
+	struct tmp108 *tmp108 = i2c_get_clientdata(client);
+
+	if (reg == TMP108_REG_CONF && !tmp108->config_reg_16bits)
+		return i2c_smbus_write_byte_data(client, reg, val >> 8);
+	return i2c_smbus_write_word_swapped(client, reg, val);
+}
+
+static const struct regmap_bus tmp108_i2c_regmap_bus = {
+	.reg_read = tmp108_i2c_reg_read,
+	.reg_write = tmp108_i2c_reg_write,
+};
+
+static int tmp108_i3c_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	struct i3c_device *i3cdev = context;
+	struct tmp108 *tmp108 = i3cdev_get_drvdata(i3cdev);
+	struct i3c_xfer xfers[] = {
+		{
+			.rnw = false,
+			.len = 1,
+			.data.out = tmp108->reg_buf,
+		},
+		{
+			.rnw = true,
+			.len = 2,
+			.data.in = tmp108->val_buf,
+		},
+	};
+	int ret;
+
+	tmp108->reg_buf[0] = reg;
+
+	if (reg == TMP108_REG_CONF && !tmp108->config_reg_16bits)
+		xfers[1].len--;
+
+	ret = i3c_device_do_xfers(i3cdev, xfers, 2, I3C_SDR);
+	if (ret < 0)
+		return ret;
+
+	*val = tmp108->val_buf[0] << 8;
+	if (!(reg == TMP108_REG_CONF && !tmp108->config_reg_16bits))
+		*val |= tmp108->val_buf[1];
+
+	return 0;
+}
+
+static int tmp108_i3c_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	struct i3c_device *i3cdev = context;
+	struct tmp108 *tmp108 = i3cdev_get_drvdata(i3cdev);
+	struct i3c_xfer xfers[] = {
+		{
+			.rnw = false,
+			.len = 3,
+			.data.out = tmp108->val_buf,
+		},
+	};
+
+	tmp108->val_buf[0] = reg;
+	tmp108->val_buf[1] = (val >> 8) & 0xff;
+
+	if (reg == TMP108_REG_CONF && !tmp108->config_reg_16bits)
+		xfers[0].len--;
+	else
+		tmp108->val_buf[2] = val & 0xff;
+
+	return i3c_device_do_xfers(i3cdev, xfers, 1, I3C_SDR);
+}
+
+static const struct regmap_bus tmp108_i3c_regmap_bus = {
+	.reg_read = tmp108_i3c_reg_read,
+	.reg_write = tmp108_i3c_reg_write,
+};
+
 static const struct regmap_config tmp108_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 16,
@@ -323,7 +431,8 @@ static const struct regmap_config tmp108_regmap_config = {
 	.use_single_write = true,
 };

-static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *name)
+static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *name,
+			       enum tmp108_hw_id hw_id)
 {
 	struct device *hwmon_dev;
 	struct tmp108 *tmp108;
@@ -340,6 +449,14 @@ static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *

 	dev_set_drvdata(dev, tmp108);
 	tmp108->regmap = regmap;
+	tmp108->hw_id = hw_id;
+	tmp108->config_reg_16bits = (hw_id == P3T1035_ID) ? false : true;
+	if (hw_id == P3T1035_ID)
+		memcpy(tmp108->sample_times, (unsigned int[]){ 125, 250, 1000, 4000 },
+		       sizeof(tmp108->sample_times));
+	else
+		memcpy(tmp108->sample_times, (unsigned int[]){ 63, 250, 1000, 4000 },
+		       sizeof(tmp108->sample_times));

 	err = regmap_read(tmp108->regmap, TMP108_REG_CONF, &config);
 	if (err < 0) {
@@ -351,7 +468,6 @@ static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *
 	/* Only continuous mode is supported. */
 	config &= ~TMP108_CONF_MODE_MASK;
 	config |= TMP108_MODE_CONTINUOUS;
-
 	/* Only comparator mode is supported. */
 	config &= ~TMP108_CONF_TM;

@@ -384,17 +500,33 @@ static int tmp108_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
 	struct regmap *regmap;
+	enum tmp108_hw_id hw_id;
+	const void *of_data;

 	if (!i2c_check_functionality(client->adapter,
-				     I2C_FUNC_SMBUS_WORD_DATA))
+				     I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
 		return dev_err_probe(dev, -ENODEV,
 				     "adapter doesn't support SMBus word transactions\n");

-	regmap = devm_regmap_init_i2c(client, &tmp108_regmap_config);
+	regmap = devm_regmap_init(dev, &tmp108_i2c_regmap_bus, client, &tmp108_regmap_config);
 	if (IS_ERR(regmap))
 		return dev_err_probe(dev, PTR_ERR(regmap), "regmap init failed");

-	return tmp108_common_probe(dev, regmap, client->name);
+	/* Prefer OF match data (DT-first systems) */
+	of_data = device_get_match_data(&client->dev);
+	if (of_data) {
+		hw_id = (unsigned long)of_data;
+	} else {
+		/* Fall back to legacy I2C ID table */
+		const struct i2c_device_id *id = i2c_client_get_device_id(client);
+
+		if (!id) {
+			return dev_err_probe(dev, -ENODEV, "No matching device ID for i2c device\n");
+		}
+		hw_id = (unsigned long)id->driver_data;
+	}
+
+	return tmp108_common_probe(dev, regmap, client->name, hw_id);
 }

 static int tmp108_suspend(struct device *dev)
@@ -420,16 +552,18 @@ static int tmp108_resume(struct device *dev)
 static DEFINE_SIMPLE_DEV_PM_OPS(tmp108_dev_pm_ops, tmp108_suspend, tmp108_resume);

 static const struct i2c_device_id tmp108_i2c_ids[] = {
-	{ "p3t1085" },
-	{ "tmp108" },
-	{ }
+	{ "p3t1035", P3T1035_ID },
+	{ "p3t1085", P3T1085_ID },
+	{ "tmp108", TMP108_ID },
+	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(i2c, tmp108_i2c_ids);

 static const struct of_device_id tmp108_of_ids[] = {
-	{ .compatible = "nxp,p3t1085", },
-	{ .compatible = "ti,tmp108", },
-	{}
+	{ .compatible = "nxp,p3t1035", .data = (void *)(uintptr_t)P3T1035_ID },
+	{ .compatible = "nxp,p3t1085", .data = (void *)(uintptr_t)P3T1085_ID },
+	{ .compatible = "ti,tmp108", .data = (void *)(uintptr_t)TMP108_ID },
+	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, tmp108_of_ids);

@@ -444,8 +578,9 @@ static struct i2c_driver tmp108_driver = {
 };

 static const struct i3c_device_id p3t1085_i3c_ids[] = {
-	I3C_DEVICE(0x011b, 0x1529, NULL),
-	{}
+	I3C_DEVICE(0x011B, 0x1529, (void *)P3T1085_ID),
+	I3C_DEVICE(0x011B, 0x152B, (void *)P3T1035_ID),
+	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(i3c, p3t1085_i3c_ids);

@@ -453,13 +588,21 @@ static int p3t1085_i3c_probe(struct i3c_device *i3cdev)
 {
 	struct device *dev = i3cdev_to_dev(i3cdev);
 	struct regmap *regmap;
+	const struct i3c_device_id *id;
+	enum tmp108_hw_id hw_id;

-	regmap = devm_regmap_init_i3c(i3cdev, &tmp108_regmap_config);
+	regmap = devm_regmap_init(dev, &tmp108_i3c_regmap_bus, i3cdev, &tmp108_regmap_config);
 	if (IS_ERR(regmap))
 		return dev_err_probe(dev, PTR_ERR(regmap),
 				     "Failed to register i3c regmap\n");

-	return tmp108_common_probe(dev, regmap, "p3t1085_i3c");
+	id = i3c_device_match_id(i3cdev, p3t1085_i3c_ids);
+	if (!id) {
+		return dev_err_probe(dev, -ENODEV, "No matching device ID for i3c device\n");
+	}
+	hw_id = (enum tmp108_hw_id)(uintptr_t)id->data;
+
+	return tmp108_common_probe(dev, regmap, "p3t1085_i3c", hw_id);
 }

 static struct i3c_driver p3t1085_driver = {
--
2.34.1

Re: [PATCH v3 2/3] hwmon: (tmp108) Add support for P3T1035 and P3T2030

[kernel test robot]

Hi Mayank,

kernel test robot noticed the following build warnings:

[auto build test WARNING on groeck-staging/hwmon-next]
[also build test WARNING on linus/master v6.19-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Mayank-Mahajan/hwmon-tmp108-Add-support-for-P3T1035-and-P3T2030/20260115-191549
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
patch link:    https://lore.kernel.org/r/20260115111418.1851-2-mayankmahajan.x%40nxp.com
patch subject: [PATCH v3 2/3] hwmon: (tmp108) Add support for P3T1035 and P3T2030
config: xtensa-randconfig-r122-20260116 (https://download.01.org/0day-ci/archive/20260116/202601161234.jWOgBbs8-lkp@intel.com/config)
compiler: xtensa-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260116/202601161234.jWOgBbs8-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601161234.jWOgBbs8-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/hwmon/tmp108.c: note: in included file (through arch/xtensa/include/asm/bitops.h, include/linux/bitops.h, include/linux/log2.h, ...):
   arch/xtensa/include/asm/processor.h:105:2: sparse: sparse: Unsupported xtensa ABI
   arch/xtensa/include/asm/processor.h:135:2: sparse: sparse: Unsupported Xtensa ABI
>> drivers/hwmon/tmp108.c:455:17: sparse: sparse: macro "memcpy" passed 6 arguments, but takes just 3
   drivers/hwmon/tmp108.c:458:17: sparse: sparse: macro "memcpy" passed 6 arguments, but takes just 3
   drivers/hwmon/tmp108.c:618:1: sparse: sparse: bad integer constant expression
   drivers/hwmon/tmp108.c:618:1: sparse: sparse: static assertion failed: "MODULE_INFO(author, ...) contains embedded NUL byte"
   drivers/hwmon/tmp108.c:619:1: sparse: sparse: bad integer constant expression
   drivers/hwmon/tmp108.c:619:1: sparse: sparse: static assertion failed: "MODULE_INFO(description, ...) contains embedded NUL byte"
   drivers/hwmon/tmp108.c:620:1: sparse: sparse: bad integer constant expression
   drivers/hwmon/tmp108.c:620:1: sparse: sparse: static assertion failed: "MODULE_INFO(license, ...) contains embedded NUL byte"

vim +/memcpy +455 drivers/hwmon/tmp108.c

   433	
   434	static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *name,
   435				       enum tmp108_hw_id hw_id)
   436	{
   437		struct device *hwmon_dev;
   438		struct tmp108 *tmp108;
   439		u32 config;
   440		int err;
   441	
   442		err = devm_regulator_get_enable(dev, "vcc");
   443		if (err)
   444			return dev_err_probe(dev, err, "Failed to enable regulator\n");
   445	
   446		tmp108 = devm_kzalloc(dev, sizeof(*tmp108), GFP_KERNEL);
   447		if (!tmp108)
   448			return -ENOMEM;
   449	
   450		dev_set_drvdata(dev, tmp108);
   451		tmp108->regmap = regmap;
   452		tmp108->hw_id = hw_id;
   453		tmp108->config_reg_16bits = (hw_id == P3T1035_ID) ? false : true;
   454		if (hw_id == P3T1035_ID)
 > 455			memcpy(tmp108->sample_times, (unsigned int[]){ 125, 250, 1000, 4000 },
   456			       sizeof(tmp108->sample_times));
   457		else
   458			memcpy(tmp108->sample_times, (unsigned int[]){ 63, 250, 1000, 4000 },
   459			       sizeof(tmp108->sample_times));
   460	
   461		err = regmap_read(tmp108->regmap, TMP108_REG_CONF, &config);
   462		if (err < 0) {
   463			dev_err(dev, "error reading config register: %d", err);
   464			return err;
   465		}
   466		tmp108->orig_config = config;
   467	
   468		/* Only continuous mode is supported. */
   469		config &= ~TMP108_CONF_MODE_MASK;
   470		config |= TMP108_MODE_CONTINUOUS;
   471		/* Only comparator mode is supported. */
   472		config &= ~TMP108_CONF_TM;
   473	
   474		err = regmap_write(tmp108->regmap, TMP108_REG_CONF, config);
   475		if (err < 0) {
   476			dev_err(dev, "error writing config register: %d", err);
   477			return err;
   478		}
   479	
   480		tmp108->ready_time = jiffies;
   481		if ((tmp108->orig_config & TMP108_CONF_MODE_MASK) ==
   482		    TMP108_MODE_SHUTDOWN)
   483			tmp108->ready_time +=
   484				msecs_to_jiffies(TMP108_CONVERSION_TIME_MS);
   485	
   486		err = devm_add_action_or_reset(dev, tmp108_restore_config, tmp108);
   487		if (err) {
   488			dev_err(dev, "add action or reset failed: %d", err);
   489			return err;
   490		}
   491	
   492		hwmon_dev = devm_hwmon_device_register_with_info(dev, name,
   493								 tmp108,
   494								 &tmp108_chip_info,
   495								 NULL);
   496		return PTR_ERR_OR_ZERO(hwmon_dev);
   497	}
   498	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH v3 2/3] hwmon: (tmp108) Add support for P3T1035 and P3T2030

[Guenter Roeck]

On 1/15/26 03:14, Mayank Mahajan wrote:
> Add support for the P3T1035 & P3T2030 temperature sensor. While mostly
> compatible with the TMP108, P3T1035 uses an 8-bit configuration register
> instead of the 16-bit layout used by TMP108. Updated driver to handle
> this difference during configuration read/write.
> 
> Signed-off-by: Mayank Mahajan <mayankmahajan.x@nxp.com>
> ---
> V1 -> V2:
> - Disabled hysteresis in is_visible function for P3T1035.
> - Added tables for conversion rate similar to the LM75 driver.
> - Implemented different bus access depending on the chip being used.
>    - Removed regmap for 8 bits; now we are using one regmap as before.
>    - Added read and write functions for i2c and i3c for use with regmap.
>    - Mapped the 8-bit configuration register to a 16 bit value for P3T1035.
> V2 -> V3:
> - Remove changes not relevant to adding a new device in the driver.
> - Address warnings due to incorrect usage of casting operations.
> - Remove the usage of P3T2030 as it's functionally identical to P3T1035.
> 
>   drivers/hwmon/Kconfig  |   2 +-
>   drivers/hwmon/tmp108.c | 227 +++++++++++++++++++++++++++++++++--------
>   2 files changed, 186 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 157678b821fc..31969bddc812 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -2398,7 +2398,7 @@ config SENSORS_TMP108
>   	select REGMAP_I3C if I3C
>   	help
>   	  If you say yes here you get support for Texas Instruments TMP108
> -	  sensor chips and NXP P3T1085.
> +	  sensor chips, NXP temperature sensors P3T1035, P3T1085 and P3T2030.
> 
>   	  This driver can also be built as a module. If so, the module
>   	  will be called tmp108.
> diff --git a/drivers/hwmon/tmp108.c b/drivers/hwmon/tmp108.c
> index 60a237cbedbc..38a2203c3bd9 100644
> --- a/drivers/hwmon/tmp108.c
> +++ b/drivers/hwmon/tmp108.c
> @@ -17,9 +17,16 @@
>   #include <linux/regmap.h>
>   #include <linux/regulator/consumer.h>
>   #include <linux/slab.h>
> +#include <linux/util_macros.h>
> 
>   #define	DRIVER_NAME "tmp108"
> 
> +enum tmp108_hw_id {
> +	P3T1035_ID,		/* For sensors p3t1035 and p3t2030 */
> +	P3T1085_ID,
> +	TMP108_ID,
> +};
> +
>   #define	TMP108_REG_TEMP		0x00
>   #define	TMP108_REG_CONF		0x01
>   #define	TMP108_REG_TLOW		0x02
> @@ -61,6 +68,7 @@
>   #define TMP108_CONVRATE_1HZ		TMP108_CONF_CR0		/* Default */
>   #define TMP108_CONVRATE_4HZ		TMP108_CONF_CR1
>   #define TMP108_CONVRATE_16HZ		(TMP108_CONF_CR0|TMP108_CONF_CR1)
> +#define TMP108_CONVRATE_SHIFT		13
> 
>   #define TMP108_CONF_HYSTERESIS_MASK	(TMP108_CONF_HYS0|TMP108_CONF_HYS1)
>   #define TMP108_HYSTERESIS_0C		0x0000
> @@ -71,11 +79,21 @@
>   #define TMP108_CONVERSION_TIME_MS	30	/* in milli-seconds */
> 
>   struct tmp108 {
> -	struct regmap *regmap;
> -	u16 orig_config;
> -	unsigned long ready_time;
> +	struct regmap		*regmap;
> +	u16			orig_config;
> +	unsigned long		ready_time;
> +	enum tmp108_hw_id	hw_id;
> +	bool			config_reg_16bits;
> +	u8			reg_buf[1];
> +	u8			val_buf[3];
> +	unsigned int		sample_times[4];
>   };
> 
> +static const u16 tmp108_sample_set_masks[] = { 3 << TMP108_CONVRATE_SHIFT,
> +					       2 << TMP108_CONVRATE_SHIFT,
> +					       1 << TMP108_CONVRATE_SHIFT,
> +					       0 << TMP108_CONVRATE_SHIFT };
> +

Unnecessary. See below.

>   /* convert 12-bit TMP108 register value to milliCelsius */
>   static inline int tmp108_temp_reg_to_mC(s16 val)
>   {
> @@ -94,6 +112,8 @@ static int tmp108_read(struct device *dev, enum hwmon_sensor_types type,
>   	struct tmp108 *tmp108 = dev_get_drvdata(dev);
>   	unsigned int regval;
>   	int err, hyst;
> +	u16 conv_rate;
> +	u8 index;
> 
>   	if (type == hwmon_chip) {
>   		if (attr == hwmon_chip_update_interval) {
> @@ -101,21 +121,10 @@ static int tmp108_read(struct device *dev, enum hwmon_sensor_types type,
>   					  &regval);
>   			if (err < 0)
>   				return err;
> -			switch (regval & TMP108_CONF_CONVRATE_MASK) {
> -			case TMP108_CONVRATE_0P25HZ:
> -			default:
> -				*temp = 4000;
> -				break;
> -			case TMP108_CONVRATE_1HZ:
> -				*temp = 1000;
> -				break;
> -			case TMP108_CONVRATE_4HZ:
> -				*temp = 250;
> -				break;
> -			case TMP108_CONVRATE_16HZ:
> -				*temp = 63;
> -				break;
> -			}
> +			conv_rate = regval & TMP108_CONF_CONVRATE_MASK;
> +			index = find_closest_descending(conv_rate, tmp108_sample_set_masks,
> +							(int)ARRAY_SIZE(tmp108_sample_set_masks));
> +			*temp = tmp108->sample_times[index];

(regval & TMP108_CONF_CONVRATE_MASK) >> TMP108_CONVRATE_SHIFT, or alternatively
FIELD_GET(TMP108_CONF_CONVRATE_MASK, regval), yields 0..3. With a sample_times
array of { 4000, 1000, 250, 63 } or { 4000, 1000, 250, 125 }, the code above
could simply be
			*temp = tmp108->sample_times[FIELD_GET(TMP108_CONF_CONVRATE_MASK, regval)];
which would both be easier to understand and much simpler.

>   			return 0;
>   		}
>   		return -EOPNOTSUPP;
> @@ -192,22 +201,17 @@ static int tmp108_write(struct device *dev, enum hwmon_sensor_types type,
>   {
>   	struct tmp108 *tmp108 = dev_get_drvdata(dev);
>   	u32 regval, mask;
> +	u8 index;
>   	int err;
> 
>   	if (type == hwmon_chip) {
>   		if (attr == hwmon_chip_update_interval) {
> -			if (temp < 156)
> -				mask = TMP108_CONVRATE_16HZ;
> -			else if (temp < 625)
> -				mask = TMP108_CONVRATE_4HZ;
> -			else if (temp < 2500)
> -				mask = TMP108_CONVRATE_1HZ;
> -			else
> -				mask = TMP108_CONVRATE_0P25HZ;
> +			index = find_closest(temp, tmp108->sample_times,
> +					     (int)ARRAY_SIZE(tmp108->sample_times));

I don't see why the type cast would be needed. Other users of find_closest()
don't need it either.

>   			return regmap_update_bits(tmp108->regmap,
>   						  TMP108_REG_CONF,
>   						  TMP108_CONF_CONVRATE_MASK,
> -						  mask);
> +						  tmp108_sample_set_masks[index]);

Use GENMASK().

>   		}
>   		return -EOPNOTSUPP;
>   	}
> @@ -251,6 +255,8 @@ static int tmp108_write(struct device *dev, enum hwmon_sensor_types type,
>   static umode_t tmp108_is_visible(const void *data, enum hwmon_sensor_types type,
>   				 u32 attr, int channel)
>   {
> +	const struct tmp108 *tmp108 = data;
> +
>   	if (type == hwmon_chip && attr == hwmon_chip_update_interval)
>   		return 0644;
> 
> @@ -264,8 +270,11 @@ static umode_t tmp108_is_visible(const void *data, enum hwmon_sensor_types type,
>   		return 0444;
>   	case hwmon_temp_min:
>   	case hwmon_temp_max:
> +		return 0644;
>   	case hwmon_temp_min_hyst:
>   	case hwmon_temp_max_hyst:
> +		if (tmp108->hw_id == P3T1035_ID)
> +			return 0;
>   		return 0644;
>   	default:
>   		return 0;
> @@ -311,6 +320,105 @@ static bool tmp108_is_volatile_reg(struct device *dev, unsigned int reg)
>   	return reg == TMP108_REG_TEMP || reg == TMP108_REG_CONF;
>   }
> 
> +static int tmp108_i2c_reg_read(void *context, unsigned int reg, unsigned int *val)
> +{
> +	struct i2c_client *client = context;
> +	struct tmp108 *tmp108 = i2c_get_clientdata(client);
> +	int ret;
> +
> +	if (reg == TMP108_REG_CONF && !tmp108->config_reg_16bits)
> +		ret = i2c_smbus_read_byte_data(client, TMP108_REG_CONF);
> +	else
> +		ret = i2c_smbus_read_word_swapped(client, reg);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	if (reg == TMP108_REG_CONF && !tmp108->config_reg_16bits)
> +		*val = ret << 8;
> +	else
> +		*val = ret;

This evaluates reg and tmp108->config_reg_16bits twice. Try

	if (reg == TMP108_REG_CONF && !tmp108->config_reg_16bits) {
		ret = i2c_smbus_read_byte_data(client, TMP108_REG_CONF);
		if (ret < 0)
			return ret;
		*val = ret << 8;
		return 0;
	}
	ret = i2c_smbus_read_word_swapped(client, reg);
	if (ret < 0)
		return ret;
	*val = ret;
	return 0;

instead to reduce runtime overhead.

> +
> +	return 0;
> +}
> +
> +static int tmp108_i2c_reg_write(void *context, unsigned int reg, unsigned int val)
> +{
> +	struct i2c_client *client = context;
> +	struct tmp108 *tmp108 = i2c_get_clientdata(client);
> +
> +	if (reg == TMP108_REG_CONF && !tmp108->config_reg_16bits)
> +		return i2c_smbus_write_byte_data(client, reg, val >> 8);
> +	return i2c_smbus_write_word_swapped(client, reg, val);
> +}
> +
> +static const struct regmap_bus tmp108_i2c_regmap_bus = {
> +	.reg_read = tmp108_i2c_reg_read,
> +	.reg_write = tmp108_i2c_reg_write,
> +};
> +
> +static int tmp108_i3c_reg_read(void *context, unsigned int reg, unsigned int *val)
> +{
> +	struct i3c_device *i3cdev = context;
> +	struct tmp108 *tmp108 = i3cdev_get_drvdata(i3cdev);
> +	struct i3c_xfer xfers[] = {
> +		{
> +			.rnw = false,
> +			.len = 1,
> +			.data.out = tmp108->reg_buf,
> +		},
> +		{
> +			.rnw = true,
> +			.len = 2,
> +			.data.in = tmp108->val_buf,

What is the point of having reg_buf and val_buf allocated instead
of just using local variables/arrays ?

> +		},
> +	};
> +	int ret;
> +
> +	tmp108->reg_buf[0] = reg;
> +
> +	if (reg == TMP108_REG_CONF && !tmp108->config_reg_16bits)
> +		xfers[1].len--;
> +
> +	ret = i3c_device_do_xfers(i3cdev, xfers, 2, I3C_SDR);
> +	if (ret < 0)
> +		return ret;
> +
> +	*val = tmp108->val_buf[0] << 8;
> +	if (!(reg == TMP108_REG_CONF && !tmp108->config_reg_16bits))

Please refrain from using double negations.
	if (reg != TMP108_REG_CONF || tmp108->config_reg_16bits)
is much easier to understand.

> +		*val |= tmp108->val_buf[1];
> +
> +	return 0;
> +}
> +
> +static int tmp108_i3c_reg_write(void *context, unsigned int reg, unsigned int val)
> +{
> +	struct i3c_device *i3cdev = context;
> +	struct tmp108 *tmp108 = i3cdev_get_drvdata(i3cdev);
> +	struct i3c_xfer xfers[] = {
> +		{
> +			.rnw = false,
> +			.len = 3,
> +			.data.out = tmp108->val_buf,
> +		},
> +	};
> +
> +	tmp108->val_buf[0] = reg;
> +	tmp108->val_buf[1] = (val >> 8) & 0xff;
> +
> +	if (reg == TMP108_REG_CONF && !tmp108->config_reg_16bits)
> +		xfers[0].len--;
> +	else
> +		tmp108->val_buf[2] = val & 0xff;
> +
> +	return i3c_device_do_xfers(i3cdev, xfers, 1, I3C_SDR);
> +}
> +
> +static const struct regmap_bus tmp108_i3c_regmap_bus = {
> +	.reg_read = tmp108_i3c_reg_read,
> +	.reg_write = tmp108_i3c_reg_write,
> +};
> +
>   static const struct regmap_config tmp108_regmap_config = {
>   	.reg_bits = 8,
>   	.val_bits = 16,
> @@ -323,7 +431,8 @@ static const struct regmap_config tmp108_regmap_config = {
>   	.use_single_write = true,
>   };
> 
> -static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *name)
> +static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *name,
> +			       enum tmp108_hw_id hw_id)
>   {
>   	struct device *hwmon_dev;
>   	struct tmp108 *tmp108;
> @@ -340,6 +449,14 @@ static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *
> 
>   	dev_set_drvdata(dev, tmp108);
>   	tmp108->regmap = regmap;
> +	tmp108->hw_id = hw_id;
> +	tmp108->config_reg_16bits = (hw_id == P3T1035_ID) ? false : true;
> +	if (hw_id == P3T1035_ID)
> +		memcpy(tmp108->sample_times, (unsigned int[]){ 125, 250, 1000, 4000 },
> +		       sizeof(tmp108->sample_times));
> +	else
> +		memcpy(tmp108->sample_times, (unsigned int[]){ 63, 250, 1000, 4000 },
> +		       sizeof(tmp108->sample_times));

You'd think that the repeated 0-day complaints have an effect.
Just make tmp108->sample_times a pointer and create two ushort arrays where the values
match the index values.

	struct tmp108 {
		ushort *sample_times;
	};

	ushort p3t_1035_sample_times[] = {4000, 1000, 250, 125};
	ushort tmp108_sample_times[] = {4000, 1000, 250, 125};

	if (hw_id == P3T1035_ID)
		tmp108->sample_times = p3t_1035_sample_times;
	else
		tmp108->sample_times = tmp108_sample_times;

Something like
	tmp108->sample_times = (ushort []) {4000, 1000, 250, 125};
might work as well, but I did not test it.
		
The memcpy is really unnecessary here.

> 
>   	err = regmap_read(tmp108->regmap, TMP108_REG_CONF, &config);
>   	if (err < 0) {
> @@ -351,7 +468,6 @@ static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *
>   	/* Only continuous mode is supported. */
>   	config &= ~TMP108_CONF_MODE_MASK;
>   	config |= TMP108_MODE_CONTINUOUS;
> -
>   	/* Only comparator mode is supported. */
>   	config &= ~TMP108_CONF_TM;
> 
> @@ -384,17 +500,33 @@ static int tmp108_probe(struct i2c_client *client)
>   {
>   	struct device *dev = &client->dev;
>   	struct regmap *regmap;
> +	enum tmp108_hw_id hw_id;
> +	const void *of_data;
> 
>   	if (!i2c_check_functionality(client->adapter,
> -				     I2C_FUNC_SMBUS_WORD_DATA))
> +				     I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
>   		return dev_err_probe(dev, -ENODEV,
>   				     "adapter doesn't support SMBus word transactions\n");
> 
> -	regmap = devm_regmap_init_i2c(client, &tmp108_regmap_config);
> +	regmap = devm_regmap_init(dev, &tmp108_i2c_regmap_bus, client, &tmp108_regmap_config);
>   	if (IS_ERR(regmap))
>   		return dev_err_probe(dev, PTR_ERR(regmap), "regmap init failed");
> 
> -	return tmp108_common_probe(dev, regmap, client->name);
> +	/* Prefer OF match data (DT-first systems) */
> +	of_data = device_get_match_data(&client->dev);
> +	if (of_data) {
> +		hw_id = (unsigned long)of_data;
> +	} else {
> +		/* Fall back to legacy I2C ID table */
> +		const struct i2c_device_id *id = i2c_client_get_device_id(client);
> +
> +		if (!id) {
> +			return dev_err_probe(dev, -ENODEV, "No matching device ID for i2c device\n");
> +		}
> +		hw_id = (unsigned long)id->driver_data;
> +	}

That complexity is unnecessary. Just use i2c_get_match_data().

> +
> +	return tmp108_common_probe(dev, regmap, client->name, hw_id);
>   }
> 
>   static int tmp108_suspend(struct device *dev)
> @@ -420,16 +552,18 @@ static int tmp108_resume(struct device *dev)
>   static DEFINE_SIMPLE_DEV_PM_OPS(tmp108_dev_pm_ops, tmp108_suspend, tmp108_resume);
> 
>   static const struct i2c_device_id tmp108_i2c_ids[] = {
> -	{ "p3t1085" },
> -	{ "tmp108" },
> -	{ }
> +	{ "p3t1035", P3T1035_ID },
> +	{ "p3t1085", P3T1085_ID },
> +	{ "tmp108", TMP108_ID },
> +	{ /* sentinel */ },
>   };
>   MODULE_DEVICE_TABLE(i2c, tmp108_i2c_ids);
> 
>   static const struct of_device_id tmp108_of_ids[] = {
> -	{ .compatible = "nxp,p3t1085", },
> -	{ .compatible = "ti,tmp108", },
> -	{}
> +	{ .compatible = "nxp,p3t1035", .data = (void *)(uintptr_t)P3T1035_ID },
> +	{ .compatible = "nxp,p3t1085", .data = (void *)(uintptr_t)P3T1085_ID },
> +	{ .compatible = "ti,tmp108", .data = (void *)(uintptr_t)TMP108_ID },
> +	{ /* sentinel */ },
>   };
>   MODULE_DEVICE_TABLE(of, tmp108_of_ids);
> 
> @@ -444,8 +578,9 @@ static struct i2c_driver tmp108_driver = {
>   };
> 
>   static const struct i3c_device_id p3t1085_i3c_ids[] = {
> -	I3C_DEVICE(0x011b, 0x1529, NULL),
> -	{}
> +	I3C_DEVICE(0x011B, 0x1529, (void *)P3T1085_ID),
> +	I3C_DEVICE(0x011B, 0x152B, (void *)P3T1035_ID),
> +	{ /* sentinel */ },

I know that some people like that comment, and I accept it for new drivers.
I do _not_ accept it being changed in existing drivers.

>   };
>   MODULE_DEVICE_TABLE(i3c, p3t1085_i3c_ids);
> 
> @@ -453,13 +588,21 @@ static int p3t1085_i3c_probe(struct i3c_device *i3cdev)
>   {
>   	struct device *dev = i3cdev_to_dev(i3cdev);
>   	struct regmap *regmap;
> +	const struct i3c_device_id *id;
> +	enum tmp108_hw_id hw_id;
> 
> -	regmap = devm_regmap_init_i3c(i3cdev, &tmp108_regmap_config);
> +	regmap = devm_regmap_init(dev, &tmp108_i3c_regmap_bus, i3cdev, &tmp108_regmap_config);
>   	if (IS_ERR(regmap))
>   		return dev_err_probe(dev, PTR_ERR(regmap),
>   				     "Failed to register i3c regmap\n");
> 
> -	return tmp108_common_probe(dev, regmap, "p3t1085_i3c");
> +	id = i3c_device_match_id(i3cdev, p3t1085_i3c_ids);
> +	if (!id) {
> +		return dev_err_probe(dev, -ENODEV, "No matching device ID for i3c device\n");
> +	}

Unnecessary error check since the id already matches or the function would not
have been called.

> +	hw_id = (enum tmp108_hw_id)(uintptr_t)id->data;
> +
> +	return tmp108_common_probe(dev, regmap, "p3t1085_i3c", hw_id);
>   }
> 
>   static struct i3c_driver p3t1085_driver = {
> --
> 2.34.1
> 

[PATCH v3 3/3] hwmon: (tmp108) Add P3T1035 and P3T2030 support

[Mayank Mahajan]

Update the hwmon driver documentation for sensors: P3T1035 and P3T2030.

Signed-off-by: Mayank Mahajan <mayankmahajan.x@nxp.com>
---
V1 -> V2:
- No changes in v2.
V2 -> V3:
- No changes in v3.

 Documentation/hwmon/tmp108.rst | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/hwmon/tmp108.rst b/Documentation/hwmon/tmp108.rst
index bc4941d98268..c218ea333dd6 100644
--- a/Documentation/hwmon/tmp108.rst
+++ b/Documentation/hwmon/tmp108.rst
@@ -3,6 +3,15 @@ Kernel driver tmp108

 Supported chips:

+  * NXP P3T1035
+
+    Prefix: 'p3t1035'
+
+    Addresses scanned: none
+
+    Datasheet: https://www.nxp.com/docs/en/data-sheet/P3T1035XUK_P3T2030XUK.pdf
+
+
   * NXP P3T1085

     Prefix: 'p3t1085'
@@ -11,6 +20,14 @@ Supported chips:

     Datasheet: https://www.nxp.com/docs/en/data-sheet/P3T1085UK.pdf

+  * NXP P3T2030
+
+    Prefix: 'p3t2030'
+
+    Addresses scanned: none
+
+    Datasheet: https://www.nxp.com/docs/en/data-sheet/P3T1035XUK_P3T2030XUK.pdf
+
   * Texas Instruments TMP108

     Prefix: 'tmp108'
--
2.34.1

Re: [PATCH v3 1/3] dt-bindings: hwmon: ti,tmp108: Add P3T1035,P3T2030

[Krzysztof Kozlowski]

On 15/01/2026 12:14, Mayank Mahajan wrote:
> Document the NXP P3T1035 and P3T2030 compatibles in TMP108.
> 
> Signed-off-by: Mayank Mahajan <mayankmahajan.x@nxp.com>
> ---
> V1 -> V2:
> - No changes in v2.
> V2 -> V3:
> - Add P3T1035 fallback for P3T2030 as they are functionally identical.
> - Add comment in the description explaining the use of P3T2030.
> 
>  .../devicetree/bindings/hwmon/ti,tmp108.yaml  | 24 ++++++++++++-------
>  1 file changed, 16 insertions(+), 8 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/ti,tmp108.yaml b/Documentation/devicetree/bindings/hwmon/ti,tmp108.yaml
> index a6f9319e068d..1f540c623de6 100644
> --- a/Documentation/devicetree/bindings/hwmon/ti,tmp108.yaml
> +++ b/Documentation/devicetree/bindings/hwmon/ti,tmp108.yaml
> @@ -4,27 +4,35 @@
>  $id: http://devicetree.org/schemas/hwmon/ti,tmp108.yaml#
>  $schema: http://devicetree.org/meta-schemas/core.yaml#
> 
> -title: TMP108/P3T1085(NXP) temperature sensor
> +title: TMP108/P3T1035/P3T1085/P3T2030 temperature sensor
> 
>  maintainers:
>    - Krzysztof Kozlowski <krzk@kernel.org>
> 
>  description: |
> -  The TMP108/P3T1085(NXP) is a digital-output temperature sensor with a
> -  dynamically-programmable limit window, and under- and overtemperature
> -  alert functions.
> +  The TMP108 or NXP P3T Family (P3T1035, P3T1085 and P3T2030) is a digital-
> +  output temperature sensor with a dynamically-programmable limit window,
> +  and under- and over-temperature alert functions.
> 
> -  P3T1085(NXP) support I3C.
> +  NXP P3T Family (P3T1035, P3T1085 and P3T2030) supports I3C.
> 
>    Datasheets:
>      https://www.ti.com/product/TMP108
>      https://www.nxp.com/docs/en/data-sheet/P3T1085UK.pdf
> +    https://www.nxp.com/docs/en/data-sheet/P3T1035XUK_P3T2030XUK.pdf
> +
> +  P3T2030 is functionally identical to P3T1035. Hence, device tree nodes that
> +  use the P3T2030 must provide a fallback compatible string of "nxp,p3t1035"

Drop the sentence. Schema already tells that. Never repeat the schema in
free text. It's like adding comments to code:

ptr = kzalloc()
/* Check for null pointer after allocation */
if (!ptr)
	return -ENOMEM

This is worse coding. Write concise, clearly readable code.

With this fixed:

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof