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

[Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>]

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@xxxxxxxxx>
> ---
> 
> See discussion:
> https://lore.kernel.org/u-boot/CACRpkdZx8EaSFLeh4vruRsdC+Sx_ieBiKmuE7t37zhiYqtS3WQ@xxxxxxxxxxxxxx/
> ---
>  .../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