linux-kernel - Re: [PATCH v5 1/2] dt-bindings: hwmon: Add nct7802 bindings

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Date:   Sat, 9 Oct 2021 16:46:50 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Oskar Senft <osk@...gle.com>, Jean Delvare <jdelvare@...e.com>,
        Rob Herring <robh+dt@...nel.org>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 1/2] dt-bindings: hwmon: Add nct7802 bindings

On 10/9/21 11:52 AM, Oskar Senft wrote:
> This change documents the device tree bindings for the Nuvoton
> NCT7802Y driver.
> 
> Signed-off-by: Oskar Senft <osk@...gle.com>
> ---

change log goes here.

>   .../bindings/hwmon/nuvoton,nct7802.yaml       | 142 ++++++++++++++++++
>   1 file changed, 142 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/hwmon/nuvoton,nct7802.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/nuvoton,nct7802.yaml b/Documentation/devicetree/bindings/hwmon/nuvoton,nct7802.yaml
> new file mode 100644
> index 000000000000..ff99f40034f2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/nuvoton,nct7802.yaml
> @@ -0,0 +1,142 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +
> +$id: http://devicetree.org/schemas/hwmon/nuvoton,nct7802.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Nuvoton NCT7802Y Hardware Monitoring IC
> +
> +maintainers:
> +  - Guenter Roeck <linux@...ck-us.net>
> +
> +description: |
> +  The NCT7802Y is a hardware monitor IC which supports one on-die and up to
> +  5 remote temperature sensors with SMBus interface.
> +

Just noticed: 5 remote temperature sensors ? Shouldn't that be 3 ?

> +  Datasheets:
> +    https://www.nuvoton.com/export/resource-files/Nuvoton_NCT7802Y_Datasheet_V12.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - nuvoton,nct7802
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  channel@0:
> +    type: object
> +    description: Local Temperature Sensor ("LTD")
> +    properties:
> +      reg:
> +        const: 0
> +    required:
> +      - reg
> +
> +  channel@1:
> +    type: object
> +    description: Remote Temperature Sensor or Voltage Sensor ("RTD1")
> +    properties:
> +      reg:
> +        const: 1
> +      sensor-type:
> +        items:
> +          - enum:
> +              - temperature
> +              - voltage
> +      temperature-mode:
> +        items:
> +          - enum:
> +              - thermistor
> +              - thermal-diode
> +    required:
> +      - reg
> +      - sensor-type

If I understand correctly, "temperature-mode" is implemented as mandatory
for channels 1 and 2 if sensor-type is "temperature" (which makes sense).
No idea though if it is possible to express that in yaml.
If not, can it be mentioned as comment ?

> +
> +  channel@2:
> +    type: object
> +    description: Remote Temperature Sensor or Voltage Sensor ("RTD2")
> +    properties:
> +      reg:
> +        const: 2
> +      sensor-type:
> +        items:
> +          - enum:
> +              - temperature
> +              - voltage
> +      temperature-mode:
> +        items:
> +          - enum:
> +              - thermistor
> +              - thermal-diode
> +    required:
> +      - reg
> +      - sensor-type
> +
> +  channel@3:
> +    type: object
> +    description: Remote Temperature Sensor or Voltage Sensor ("RTD3")
> +    properties:
> +      reg:
> +        const: 3
> +      sensor-type:
> +        items:
> +          - enum:
> +              - temperature
> +              - voltage
> +    required:
> +      - reg
> +      - sensor-type
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        nct7802@28 {
> +            compatible = "nuvoton,nct7802";
> +            reg = <0x28>;
> +
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            channel@0 { /* LTD */
> +              reg = <0>;
> +              status = "okay";
> +            };
> +
> +            channel@1 { /* RTD1 */
> +              reg = <1>;
> +              status = "okay";
> +              sensor-type = "temperature";
> +              temperature-mode = "thermistor";
> +            };
> +
> +            channel@2 { /* RTD2 */
> +              reg = <2>;
> +              status = "okay";
> +              sensor-type = "temperature";
> +              temperature-mode = "thermal-diode";
> +            };
> +
> +            channel@3 { /* RTD3 */
> +              reg = <3>;
> +              status = "okay";
> +              sensor-type = "voltage";
> +            };
> +        };
> +    };
>