linux-kernel - Re: [PATCH 1/2] dt-bindings: mmc: mmc-pwrseq-simple: add support for reset control

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Message-ID: <kpg2cwn7eq7wclpmcudwmygqzzn7s5fb4i7c2dbjlks5bttghs@aekop3ugv26s>
Date: Sun, 6 Oct 2024 14:37:43 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Catalin Popescu <catalin.popescu@...ca-geosystems.com>
Cc: ulf.hansson@...aro.org, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, p.zabel@...gutronix.de, linux-mmc@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, m.felsch@...gutronix.de, 
	bsp-development.geo@...ca-geosystems.com
Subject: Re: [PATCH 1/2] dt-bindings: mmc: mmc-pwrseq-simple: add support for
 reset control

On Fri, Oct 04, 2024 at 02:07:39PM +0200, Catalin Popescu wrote:
> Add compatible value "mmc-pwrseq-simple-reset" to support reset control
> instead of gpios. Reset controls being refcounted, they allow to use
> shared resets or gpios across drivers. Support of reset control is
> limited to one single reset control.

Driver support is not that relevant to the bindings.

> 
> Signed-off-by: Catalin Popescu <catalin.popescu@...ca-geosystems.com>
> ---
>  .../bindings/mmc/mmc-pwrseq-simple.yaml       | 21 +++++++++++++++++--
>  1 file changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml
> index 00feaafc1063..da218260af01 100644
> --- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml
> +++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml
> @@ -16,12 +16,13 @@ description:
>  
>  properties:
>    compatible:
> -    const: mmc-pwrseq-simple
> +    enum:
> +      - mmc-pwrseq-simple
> +      - mmc-pwrseq-simple-reset

Nope, that's the same device.

>  
>    reset-gpios:
>      minItems: 1
>      # Put some limit to avoid false warnings
> -    maxItems: 32
>      description:
>        contains a list of GPIO specifiers. The reset GPIOs are asserted
>        at initialization and prior we start the power up procedure of the card.
> @@ -50,6 +51,22 @@ properties:
>  required:
>    - compatible
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - mmc-pwrseq-simple-reset
> +    then:
> +      properties:
> +        reset-gpios:
> +          maxItems: 1
> +    else:
> +      properties:
> +        reset-gpios:
> +          maxItems: 32

So basically they are the same... Sorry, this all patch makes little
sense to me. You are not doing here much. It's exactly the same device
which you now describe in two ways (first no-go) but the two ways are
actually the same (second no-go).

Best regards,
Krzysztof