linux-kernel - Re: [PATCH v11 1/3] dt-bindings: i2c: Add Maxim MAX735x/MAX736x variants

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Message-ID: <83947c77-de8c-fc39-6721-e1e1cb5fc3fc@linaro.org>
Date:   Fri, 14 Apr 2023 23:12:11 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Patrick Rudolph <patrick.rudolph@...ements.com>,
        Peter Rosin <peda@...ntia.se>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 1/3] dt-bindings: i2c: Add Maxim MAX735x/MAX736x
 variants

On 14/04/2023 13:01, Patrick Rudolph wrote:
> Update the pca954x bindings to add support for the Maxim MAX735x/MAX736x
> chips. The functionality will be provided by the exisintg pca954x driver.

Typo: existing


> 
> While on it make the interrupts support conditionally as not all of the
> existing chips have interrupts.
> 
> For chips that are powered off by default add an optional regulator
> called vdd-supply.
> 
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
> ---
>  .../bindings/i2c/i2c-mux-pca954x.yaml         | 45 ++++++++++++++++---
>  1 file changed, 39 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> index 9f1726d0356b..6fed6eae9c9b 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> @@ -4,21 +4,29 @@
>  $id: http://devicetree.org/schemas/i2c/i2c-mux-pca954x.yaml#
>  $schema: http://devicetree.org/meta-schemas/core.yaml#
>  
> -title: NXP PCA954x I2C bus switch
> +title: NXP PCA954x I2C and compatible bus switches
>  
>  maintainers:
>    - Laurent Pinchart <laurent.pinchart@...asonboard.com>
>  
>  description:
> -  The binding supports NXP PCA954x and PCA984x I2C mux/switch devices.
> -
> -allOf:
> -  - $ref: /schemas/i2c/i2c-mux.yaml#
> +  The NXP PCA954x and compatible devices are I2C bus
> +  multiplexer/switches that share the same functionality
> +  and register layout.
> +  The devices usually have 4 or 8 child buses, which are
> +  attached to the parent bus by using the SMBus "Send Byte"
> +  command.
>  
>  properties:
>    compatible:
>      oneOf:
>        - enum:
> +          - maxim,max7356
> +          - maxim,max7357
> +          - maxim,max7358
> +          - maxim,max7367
> +          - maxim,max7368
> +          - maxim,max7369
>            - nxp,pca9540
>            - nxp,pca9542
>            - nxp,pca9543
> @@ -59,10 +67,33 @@ properties:
>      description: if present, overrides i2c-mux-idle-disconnect
>      $ref: /schemas/mux/mux-controller.yaml#/properties/idle-state
>  
> +  vdd-supply:
> +    description: A voltage regulator supplying power to the chip.
> +
>  required:
>    - compatible
>    - reg
>  
> +allOf:
> +  - $ref: /schemas/i2c/i2c-mux.yaml#
> +  - if:
> +      not:
> +        properties:
> +          compatible:
> +            contains:
> +              enum:
> +                - maxim,max7367
> +                - maxim,max7369
> +                - nxp,pca9542
> +                - nxp,pca9543
> +                - nxp,pca9544
> +                - nxp,pca9545

That's independent change. You add here support for Maxim devices, not
customize PCA. Please split it to new patch (first in the series).

> +    then:
> +      properties:
> +        interrupts: false
> +        "#interrupt-cells": false
> +        interrupt-controller: false
> +
>  unevaluatedProperties: false
>  
>  examples:
> @@ -74,11 +105,13 @@ examples:
>          #size-cells = <0>;
>  
>          i2c-mux@74 {
> -            compatible = "nxp,pca9548";
> +            compatible = "nxp,pca9545";

Best regards,
Krzysztof