linux-kernel - Re: [PATCH 1/2] dt-bindings: pinctrl: samsung: google,gs101-pinctrl needs a clock

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Date: Thu, 25 Apr 2024 20:15:05 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: André Draszik <andre.draszik@...aro.org>,
 Sylwester Nawrocki <s.nawrocki@...sung.com>,
 Alim Akhtar <alim.akhtar@...sung.com>,
 Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Tomasz Figa <tomasz.figa@...il.com>,
 Peter Griffin <peter.griffin@...aro.org>
Cc: Tudor Ambarus <tudor.ambarus@...aro.org>,
 Will McVicker <willmcvicker@...gle.com>, kernel-team@...roid.com,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: pinctrl: samsung: google,gs101-pinctrl
 needs a clock

On 25/04/2024 18:03, André Draszik wrote:
> The pin controller on Google Tensor gs101 requires a bus clock for
> register access to work. Add it.
> 
> Signed-off-by: André Draszik <andre.draszik@...aro.org>
> 
> ---
> As we only have the one clock here, please let me know if the
> clock-names should be removed. Having it does make
> /sys/kernel/debug/clk/clk_summary look nicer / more meaningful though
> :-)
> ---
>  .../devicetree/bindings/pinctrl/samsung,pinctrl.yaml    | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/samsung,pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/samsung,pinctrl.yaml
> index 118549c25976..49cc36b76fd0 100644
> --- a/Documentation/devicetree/bindings/pinctrl/samsung,pinctrl.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/samsung,pinctrl.yaml
> @@ -73,6 +73,13 @@ properties:
>      minItems: 1
>      maxItems: 2
>  
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    items:
> +      - const: pclk
> +
>    wakeup-interrupt-controller:
>      $ref: samsung,pinctrl-wakeup-interrupt.yaml
>  
> @@ -120,6 +127,16 @@ required:
>  
>  allOf:
>    - $ref: pinctrl.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: google,gs101-pinctrl
> +    then:
> +      required:
> +        - clocks
> +        - clock-names

else:
  properties:
    clocks: false
    clock-names: false

but anyway this is all a bit fragile, because pinctrl is not a driver
and you rely on initcall ordering.

> 

Best regards,
Krzysztof