linux-kernel - Re: [PATCH 2/2] dt-bindings: gpio: fairchild,74hc595: add strobe-gpios property

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Message-ID: <9448dcb4-7eac-7efa-0062-bcc1797fa09d@linaro.org>
Date:   Thu, 21 Jul 2022 12:03:37 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Marcus Folkesson <marcus.folkesson@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Ripard <mripard@...nel.org>
Cc:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: gpio: fairchild,74hc595: add
 strobe-gpios property

On 21/07/2022 11:34, Marcus Folkesson wrote:
> Some shift registers (74hc4094 for example) has a strobe signal to latch
> data from the serial input to the parallel output.
> 
> Add an optional strobe-gpios property to support those chips.
> 
> Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
> ---
>  .../devicetree/bindings/gpio/fairchild,74hc595.yaml         | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml b/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml
> index a99e7842ca17..9893df9ae22c 100644
> --- a/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml
> +++ b/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml
> @@ -14,6 +14,8 @@ properties:
>      enum:
>        - fairchild,74hc595
>        - nxp,74lvc594
> +      - ti,cd54hc4094
> +      - ti,cd74hc4094
>  
>    reg:
>      maxItems: 1
> @@ -33,6 +35,10 @@ properties:
>      description: GPIO connected to the OE (Output Enable) pin.
>      maxItems: 1
>  
> +  strobe-gpios:
> +    description: GPIO connected to the STROBE pin
> +    maxItems: 1

This should be disallowed (in allOf:if:then) for variants which do not
support it (or do not have even STROBE pin).


Best regards,
Krzysztof