linux-kernel - Re: [PATCH v4 2/7] dt-bindings: gpio: rockchip,gpio-bank: add unique hardware GPIO ID

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Message-ID: <d4d4c5e6-4700-2404-618a-5cb21946b555@linaro.org>
Date:   Fri, 24 Feb 2023 12:13:59 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Johan Jonker <jbx6244@...il.com>, linus.walleij@...aro.org,
        brgl@...ev.pl
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        heiko@...ech.de, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/7] dt-bindings: gpio: rockchip,gpio-bank: add unique
 hardware GPIO ID

On 23/02/2023 20:46, Johan Jonker wrote:
> Add a unique hardware GPIO ID to the Rockchip GPIO nodes with
> the "rockchip,gpio-controller" property to be independent from aliases
> and probe order. "gpio-ranges" can't be used for that, because there is
> no semantic restrictions on how they are set up.
> 
> Signed-off-by: Johan Jonker <jbx6244@...il.com>
> ---
> 
> See discussion:
> https://lore.kernel.org/u-boot/CACRpkdZx8EaSFLeh4vruRsdC+Sx_ieBiKmuE7t37zhiYqtS3WQ@mail.gmail.com/
> ---
>  .../devicetree/bindings/gpio/rockchip,gpio-bank.yaml        | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/gpio/rockchip,gpio-bank.yaml b/Documentation/devicetree/bindings/gpio/rockchip,gpio-bank.yaml
> index 2e9a5179c..39ac41e9d 100644
> --- a/Documentation/devicetree/bindings/gpio/rockchip,gpio-bank.yaml
> +++ b/Documentation/devicetree/bindings/gpio/rockchip,gpio-bank.yaml
> @@ -52,6 +52,12 @@ properties:
> 
>    gpio-line-names: true
> 
> +  rockchip,gpio-controller:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    maximum: 8
> +    description:
> +      Unique hardware GPIO ID.

Neither commit msg nor this description explain why do you need it.
Also: what is a unique ID? why only 8 of them are allowed? Why assigning
arbitrary numbers should be a property of DT (answer: it's not)?

Best regards,
Krzysztof