linux-kernel - Re: [PATCH] dt-bindings: gpio: add common consumer GPIO lines

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Message-ID: <CACRpkdZATQubzrzqq2b4VY+W3Pb9RfzOGRiF+34YhEqpSKyUZg@mail.gmail.com>
Date:   Sat, 26 Mar 2022 01:28:06 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH] dt-bindings: gpio: add common consumer GPIO lines

On Tue, Mar 15, 2022 at 9:37 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...onical.com> wrote:

> Typical GPIO lines like enable, powerdown, reset or wakeup are not
> documented as common, which leads to new variations of these (e.g.
> pwdn-gpios).  Add a common schema which serves also as a documentation
> for preferred naming.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>

I like the idea!

> +  enable-gpios:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +
> +  reset-gpios:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +
> +  powerdown-gpios:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +
> +  pwdn-gpios:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description: Use powerdown-gpios
> +    deprecated: true
> +
> +  wakeup-gpios:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array

I would underscore either on each one or in a global description:
that lines on components that indicate they are active low
such as RESETN, RESET* etc MUST have the flag in the
second cell set to GPIO_ACTIVE_LOW.

Yours,
Linus Walleij