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Sender: Guenter Roeck <groeck7@gmail.com>
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Date: Sat, 25 May 2024 07:32:04 -0700
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Subject: Re: [PATCH 2/3] dt-bindings: hwmon: g76x: Add support for g761
To: Christian Marangi <ansuelsmth@gmail.com>, Jean Delvare
 <jdelvare@suse.com>, Rob Herring <robh@kernel.org>,
 Krzysztof Kozlowski <krzk+dt@kernel.org>, Conor Dooley
 <conor+dt@kernel.org>, linux-hwmon@vger.kernel.org,
 devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20240525102914.22634-1-ansuelsmth@gmail.com>
 <20240525102914.22634-2-ansuelsmth@gmail.com>
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From: Guenter Roeck <linux@roeck-us.net>
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In-Reply-To: <20240525102914.22634-2-ansuelsmth@gmail.com>
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On 5/25/24 03:29, Christian Marangi wrote:
> Add support for g761 PWM Fan controller. This is an exact copy of g763
> with the difference that it does also support an internal clock
> oscillators.
> 
> Add required logic to support this additional feature with the property
> gmt,internal-clock and reject invalid schema that define both
> internal-clock property and external clocks.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
> ---
>   .../devicetree/bindings/hwmon/gmt,g76x.yaml   | 43 +++++++++++++++++--
>   1 file changed, 40 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/gmt,g76x.yaml b/Documentation/devicetree/bindings/hwmon/gmt,g76x.yaml
> index bfefe49f54bf..d6e80392d045 100644
> --- a/Documentation/devicetree/bindings/hwmon/gmt,g76x.yaml
> +++ b/Documentation/devicetree/bindings/hwmon/gmt,g76x.yaml
> @@ -4,13 +4,13 @@
>   $id: http://devicetree.org/schemas/hwmon/gmt,g76x.yaml#
>   $schema: http://devicetree.org/meta-schemas/core.yaml#
>   
> -title: GMT G762/G763 PWM Fan controller
> +title: GMT G761/G762/G763 PWM Fan controller
>   
>   maintainers:
>     - Christian Marangi <ansuelsmth@gmail.com>
>   
>   description: |
> -  GMT G762/G763 PWM Fan controller.
> +  GMT G761/G762/G763 PWM Fan controller.
>   
>     If an optional property is not set in DT, then current value is kept
>     unmodified (e.g. bootloader installed value).
> @@ -22,6 +22,7 @@ description: |
>   properties:
>     compatible:
>       enum:
> +      - gmt,g761
>         - gmt,g762
>         - gmt,g763
>   
> @@ -48,10 +49,37 @@ properties:
>       $ref: /schemas/types.yaml#/definitions/uint32
>       enum: [0, 1, 2]
>   
> +  gmt,internal-clock:
> +    description: Use the Internal clock instead of externally attached one
> +      via the CLK pin.
> +    type: boolean
> +
>   required:
>     - compatible
>     - reg
> -  - clocks
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - gmt,g762
> +              - gmt,g763
> +    then:
> +      properties:
> +        gmt,internal-clock: false
> +
> +      required:
> +        - clocks

Is the new property even necessary ? The absence of an external clock on G761
could be used to imply that the internal clock is used.

Guenter

> +
> +  - if:
> +      required:
> +        - gmt,internal-clock
> +
> +    then:
> +      properties:
> +        clocks: false
>   
>   additionalProperties: false
>   
> @@ -80,4 +108,13 @@ examples:
>               fan_startv = <1>;
>               pwm_polarity = <0>;
>           };
> +
> +        g761@1e {
> +            compatible = "gmt,g761";
> +            reg = <0x1e>;
> +            gmt,internal-clock;
> +            fan_gear_mode = <0>;
> +            fan_startv = <1>;
> +            pwm_polarity = <0>;
> +        };
>       };