linux-kernel - Re: [PATCH 1/4] dt-bindings: i2c Update PCA954x

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Date:   Wed, 15 Dec 2021 14:33:38 -0600
From:   Rob Herring <robh@...nel.org>
To:     Patrick Rudolph <patrick.rudolph@...ements.com>
Cc:     Peter Rosin <peda@...ntia.se>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: i2c Update PCA954x

On Tue, Dec 14, 2021 at 10:50:18AM +0100, Patrick Rudolph wrote:
> Add the Maxim MAX735x as supported chip to PCA954x and add an
> example how to use it.

The subject needs some work. Every change is an 'update' and you should 
say something about Maxim. 'Add Maxim MAX735x variants' or something.

> 
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
> ---
>  .../bindings/i2c/i2c-mux-pca954x.yaml         | 40 +++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> index 9f1726d0356b..bd794cb80c11 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> @@ -11,6 +11,7 @@ maintainers:
>  
>  description:
>    The binding supports NXP PCA954x and PCA984x I2C mux/switch devices.
> +  Compatible with Maxim MAX7356 - MAX7358 I2C mux/switch devices.
>  
>  allOf:
>    - $ref: /schemas/i2c/i2c-mux.yaml#
> @@ -19,6 +20,9 @@ properties:
>    compatible:
>      oneOf:
>        - enum:
> +          - maxim,max7356
> +          - maxim,max7357
> +          - maxim,max7358
>            - nxp,pca9540
>            - nxp,pca9542
>            - nxp,pca9543
> @@ -40,6 +44,7 @@ properties:
>  
>    interrupts:
>      maxItems: 1
> +    description: Only supported on NXP devices. Unsupported on Maxim MAX735x.

You can express that as an if/then schema.

Just 'interrupts: false' for maxim compatibles. There's lots of 
examples in the tree.

>  
>    "#interrupt-cells":
>      const: 2
> @@ -100,6 +105,41 @@ examples:
>                  #size-cells = <0>;
>                  reg = <4>;
>  
> +                rtc@51 {
> +                    compatible = "nxp,pcf8563";
> +                    reg = <0x51>;
> +                };

Unrelated change.

> +            };
> +        };
> +    };
> +
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;

Really need another example?

> +
> +        i2c-mux@74 {
> +            compatible = "maxim,max7357";
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            reg = <0x74>;
> +
> +            i2c@1 {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                reg = <1>;
> +
> +                eeprom@54 {
> +                    compatible = "atmel,24c08";
> +                    reg = <0x54>;
> +                };
> +            };
> +
> +            i2c@7 {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                reg = <7>;
> +
>                  rtc@51 {
>                      compatible = "nxp,pcf8563";
>                      reg = <0x51>;
> -- 
> 2.33.1
> 
>