[PATCH v4 0/2] hwmon/tmp401: add support of three advanced features

[PATCH v4 0/2] hwmon/tmp401: add support of three advanced features

[Camel Guo]

According the their datasheets:
- TMP401, TMP411 and TMP43x support extended temperature range;
- TMP411 and TMP43x support n-factor correction;
- TMP43x support beta compensation.

In order to make it possible for users to enable these features and set up them
based on their needs, this patch series adds the following devicetree bindings:
- ti,extended-range-enable;
- ti,n-factor;
- ti,beta-compensation.
In the meanwhile, tmp401 driver reads them and configures the coressponding
registers accordingly.

v4:
- just add reviewed-by, no change on code.

v3:
- dt-bindings: remove unused [address|size]_cells and ti,beta-compensation.items
  from ti,tmp401.yaml;
- dt-bindings: change ti,n-factor range to [-128, 127];
- tmp401.c: instead of u32, use s32 for ti,n-factor.

v2:
- dt-bindings: fix format and describe hardware properties instead of
  programming models in ti,tmp401.yaml.

Cc: linux-hwmon@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

Camel Guo (2):
  dt-bindings: hwmon: Add TMP401, TMP411 and TMP43x
  hwmon: (tmp401) Add support of three advanced features

 .../devicetree/bindings/hwmon/ti,tmp401.yaml  | 105 ++++++++++++++++++
 MAINTAINERS                                   |   1 +
 drivers/hwmon/tmp401.c                        |  44 +++++++-
 3 files changed, 149 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/hwmon/ti,tmp401.yaml


base-commit: ce522ba9ef7e2d9fb22a39eb3371c0c64e2a433e
-- 
2.30.2

[PATCH v4 1/2] dt-bindings: hwmon: Add TMP401, TMP411 and TMP43x

[Camel Guo]

Document the TMP401, TMP411 and TMP43x device devicetree bindings

Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Camel Guo <camel.guo@axis.com>
---

Notes:
    v4:
    - Add Reviewed-by from Rob H.
    
    v3:
    - Remove unneeded address-cells and size-cells;
    - Change range of ti,n-factor to [-128, 127];
    - Remove unneeded 'items' of ti,beta-compensation;
    - Got Reviewed-by from Krzysztof.
    
    v2:
    - Fix format and describe hardware properties instead of programming
      models

 .../devicetree/bindings/hwmon/ti,tmp401.yaml  | 105 ++++++++++++++++++
 MAINTAINERS                                   |   1 +
 2 files changed, 106 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/ti,tmp401.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/ti,tmp401.yaml b/Documentation/devicetree/bindings/hwmon/ti,tmp401.yaml
new file mode 100644
index 000000000000..fe0ac08faa1a
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/ti,tmp401.yaml
@@ -0,0 +1,105 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/ti,tmp401.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TMP401, TPM411 and TMP43x temperature sensor
+
+maintainers:
+  - Guenter Roeck <linux@roeck-us.net>
+
+description: |
+  ±1°C Remote and Local temperature sensor
+
+  Datasheets:
+  https://www.ti.com/lit/ds/symlink/tmp401.pdf
+  https://www.ti.com/lit/ds/symlink/tmp411.pdf
+  https://www.ti.com/lit/ds/symlink/tmp431.pdf
+  https://www.ti.com/lit/ds/symlink/tmp435.pdf
+
+properties:
+  compatible:
+    enum:
+      - ti,tmp401
+      - ti,tmp411
+      - ti,tmp431
+      - ti,tmp432
+      - ti,tmp435
+
+  reg:
+    maxItems: 1
+
+  ti,extended-range-enable:
+    description:
+      When set, this sensor measures over extended temperature range.
+    type: boolean
+
+  ti,n-factor:
+    description:
+      value to be used for converting remote channel measurements to
+      temperature.
+    $ref: /schemas/types.yaml#/definitions/int32
+    items:
+      minimum: -128
+      maximum: 127
+
+  ti,beta-compensation:
+    description:
+      value to select beta correction range.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 15
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - ti,tmp401
+    then:
+      properties:
+        ti,n-factor: false
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - ti,tmp401
+              - ti,tmp411
+    then:
+      properties:
+        ti,beta-compensation: false
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      sensor@4c {
+        compatible = "ti,tmp401";
+        reg = <0x4c>;
+      };
+    };
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      sensor@4c {
+        compatible = "ti,tmp431";
+        reg = <0x4c>;
+        ti,extended-range-enable;
+        ti,n-factor = <0x3b>;
+        ti,beta-compensation = <0x7>;
+      };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 61d9f114c37f..6b0d8f5cc68e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19838,6 +19838,7 @@ TMP401 HARDWARE MONITOR DRIVER
 M:	Guenter Roeck <linux@roeck-us.net>
 L:	linux-hwmon@vger.kernel.org
 S:	Maintained
+F:	Documentation/devicetree/bindings/hwmon/ti,tmp401.yaml
 F:	Documentation/hwmon/tmp401.rst
 F:	drivers/hwmon/tmp401.c
 
-- 
2.30.2

[PATCH v4 2/2] hwmon: (tmp401) Add support of three advanced features

[Camel Guo]

tmp401 driver supports TMP401, TMP411 and TMP43X temperature sensors.
According to their datasheet:
- all of them support extended temperature range feature;
- TMP411 and TPM43X support n-factor correction feature;
- TMP43X support beta compensation feature.

In order to support setting them during bootup, this commit reads
ti,extended-range-enable, ti,n-factor and ti,beta-compensation and set
the corresponding registers during probing.

Signed-off-by: Camel Guo <camel.guo@axis.com>
---

Notes:
    v4: no change
    
    v3:
    - Instead of u32, use s32 for ti,n-factor.
    
    v2: no change

 drivers/hwmon/tmp401.c | 44 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/tmp401.c b/drivers/hwmon/tmp401.c
index b86d9df7105d..8f49da997367 100644
--- a/drivers/hwmon/tmp401.c
+++ b/drivers/hwmon/tmp401.c
@@ -41,6 +41,8 @@ enum chips { tmp401, tmp411, tmp431, tmp432, tmp435 };
 #define TMP401_STATUS				0x02
 #define TMP401_CONFIG				0x03
 #define TMP401_CONVERSION_RATE			0x04
+#define TMP4XX_N_FACTOR_REG			0x18
+#define TMP43X_BETA_RANGE			0x25
 #define TMP401_TEMP_CRIT_HYST			0x21
 #define TMP401_MANUFACTURER_ID_REG		0xFE
 #define TMP401_DEVICE_ID_REG			0xFF
@@ -543,6 +545,8 @@ static int tmp401_init_client(struct tmp401_data *data)
 	struct regmap *regmap = data->regmap;
 	u32 config, config_orig;
 	int ret;
+	u32 val = 0;
+	s32 nfactor = 0;
 
 	/* Set conversion rate to 2 Hz */
 	ret = regmap_write(regmap, TMP401_CONVERSION_RATE, 5);
@@ -557,10 +561,48 @@ static int tmp401_init_client(struct tmp401_data *data)
 	config_orig = config;
 	config &= ~TMP401_CONFIG_SHUTDOWN;
 
+	if (of_property_read_bool(data->client->dev.of_node, "ti,extended-range-enable")) {
+		/* Enable measurement over extended temperature range */
+		config |= TMP401_CONFIG_RANGE;
+	}
+
 	data->extended_range = !!(config & TMP401_CONFIG_RANGE);
 
-	if (config != config_orig)
+	if (config != config_orig) {
 		ret = regmap_write(regmap, TMP401_CONFIG, config);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = of_property_read_u32(data->client->dev.of_node, "ti,n-factor", &nfactor);
+	if (!ret) {
+		if (data->kind == tmp401) {
+			dev_err(&data->client->dev, "ti,tmp401 does not support n-factor correction\n");
+			return -EINVAL;
+		}
+		if (nfactor < -128 || nfactor > 127) {
+			dev_err(&data->client->dev, "n-factor is invalid (%d)\n", nfactor);
+			return -EINVAL;
+		}
+		ret = regmap_write(regmap, TMP4XX_N_FACTOR_REG, (unsigned int)nfactor);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = of_property_read_u32(data->client->dev.of_node, "ti,beta-compensation", &val);
+	if (!ret) {
+		if (data->kind == tmp401 || data->kind == tmp411) {
+			dev_err(&data->client->dev, "ti,tmp401 or ti,tmp411 does not support beta compensation\n");
+			return -EINVAL;
+		}
+		if (val > 15) {
+			dev_err(&data->client->dev, "beta-compensation is invalid (%u)\n", val);
+			return -EINVAL;
+		}
+		ret = regmap_write(regmap, TMP43X_BETA_RANGE, val);
+		if (ret < 0)
+			return ret;
+	}
 
 	return ret;
 }
-- 
2.30.2

Re: [PATCH v4 1/2] dt-bindings: hwmon: Add TMP401, TMP411 and TMP43x

[Guenter Roeck]

On Thu, Apr 14, 2022 at 09:58:22AM +0200, Camel Guo wrote:
> Document the TMP401, TMP411 and TMP43x device devicetree bindings
> 
> Reviewed-by: Rob Herring <robh@kernel.org>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Signed-off-by: Camel Guo <camel.guo@axis.com>

Applied to hwmon-next.

Thanks,
Guenter

> ---
> 
> Notes:
>     v4:
>     - Add Reviewed-by from Rob H.
>     
>     v3:
>     - Remove unneeded address-cells and size-cells;
>     - Change range of ti,n-factor to [-128, 127];
>     - Remove unneeded 'items' of ti,beta-compensation;
>     - Got Reviewed-by from Krzysztof.
>     
>     v2:
>     - Fix format and describe hardware properties instead of programming
>       models
> 
>  .../devicetree/bindings/hwmon/ti,tmp401.yaml  | 105 ++++++++++++++++++
>  MAINTAINERS                                   |   1 +
>  2 files changed, 106 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/ti,tmp401.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/ti,tmp401.yaml b/Documentation/devicetree/bindings/hwmon/ti,tmp401.yaml
> new file mode 100644
> index 000000000000..fe0ac08faa1a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/ti,tmp401.yaml
> @@ -0,0 +1,105 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/ti,tmp401.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TMP401, TPM411 and TMP43x temperature sensor
> +
> +maintainers:
> +  - Guenter Roeck <linux@roeck-us.net>
> +
> +description: |
> +  ±1°C Remote and Local temperature sensor
> +
> +  Datasheets:
> +  https://www.ti.com/lit/ds/symlink/tmp401.pdf
> +  https://www.ti.com/lit/ds/symlink/tmp411.pdf
> +  https://www.ti.com/lit/ds/symlink/tmp431.pdf
> +  https://www.ti.com/lit/ds/symlink/tmp435.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,tmp401
> +      - ti,tmp411
> +      - ti,tmp431
> +      - ti,tmp432
> +      - ti,tmp435
> +
> +  reg:
> +    maxItems: 1
> +
> +  ti,extended-range-enable:
> +    description:
> +      When set, this sensor measures over extended temperature range.
> +    type: boolean
> +
> +  ti,n-factor:
> +    description:
> +      value to be used for converting remote channel measurements to
> +      temperature.
> +    $ref: /schemas/types.yaml#/definitions/int32
> +    items:
> +      minimum: -128
> +      maximum: 127
> +
> +  ti,beta-compensation:
> +    description:
> +      value to select beta correction range.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 0
> +    maximum: 15
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - ti,tmp401
> +    then:
> +      properties:
> +        ti,n-factor: false
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - ti,tmp401
> +              - ti,tmp411
> +    then:
> +      properties:
> +        ti,beta-compensation: false
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      sensor@4c {
> +        compatible = "ti,tmp401";
> +        reg = <0x4c>;
> +      };
> +    };
> +  - |
> +    i2c {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      sensor@4c {
> +        compatible = "ti,tmp431";
> +        reg = <0x4c>;
> +        ti,extended-range-enable;
> +        ti,n-factor = <0x3b>;
> +        ti,beta-compensation = <0x7>;
> +      };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 61d9f114c37f..6b0d8f5cc68e 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19838,6 +19838,7 @@ TMP401 HARDWARE MONITOR DRIVER
>  M:	Guenter Roeck <linux@roeck-us.net>
>  L:	linux-hwmon@vger.kernel.org
>  S:	Maintained
> +F:	Documentation/devicetree/bindings/hwmon/ti,tmp401.yaml
>  F:	Documentation/hwmon/tmp401.rst
>  F:	drivers/hwmon/tmp401.c
>  

Re: [PATCH v4 2/2] hwmon: (tmp401) Add support of three advanced features

[Guenter Roeck]

On Thu, Apr 14, 2022 at 09:58:23AM +0200, Camel Guo wrote:
> tmp401 driver supports TMP401, TMP411 and TMP43X temperature sensors.
> According to their datasheet:
> - all of them support extended temperature range feature;
> - TMP411 and TPM43X support n-factor correction feature;
> - TMP43X support beta compensation feature.
> 
> In order to support setting them during bootup, this commit reads
> ti,extended-range-enable, ti,n-factor and ti,beta-compensation and set
> the corresponding registers during probing.
> 
> Signed-off-by: Camel Guo <camel.guo@axis.com>

Applied to hwmon-next.

Thanks,
Guenter