linux-kernel - Re: [PATCH 2/2] dt-bindings: mmc: sdhci-msm: allow flexible order of optional clocks

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Message-ID: <20230825-oversight-dense-8dcf05e38f75@spud>
Date:   Fri, 25 Aug 2023 16:29:53 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: mmc: sdhci-msm: allow flexible order of
 optional clocks

On Fri, Aug 25, 2023 at 03:55:03PM +0200, Krzysztof Kozlowski wrote:
> The Qualcomm SDHCI controller lists optional clocks, but still expects
> fixed order of them and does not allow to skip such clocks if further
> one in the list is needed.  These optional clocks are truly optional,
> so we need to allow the list to have different orders.  The clocks are:
>  - ice: used for Inline Crypto Engine, which is actually separate block
>    and merging it with SDHCI is not a requirement,
>  - bus: clock for SDCC bus frequency voting,
>  - cal and sleep: used for RCLK delay calibration and required for
>    certain platforms for such calibration (as expressed in original
>    commit 4946b3af5e8e ("mmc: sdhci-msm: Enable delay circuit
>    calibration clocks")).  Only MSM8974pro has these clocks.
> 
> Relaxing the order fixes dtbs_check warnings:
> 
>   qcom-msm8974pro-fairphone-fp2.dtb: mmc@...24900: clock-names:3: 'ice' was expected
>   qcom-msm8974pro-fairphone-fp2.dtb: mmc@...24900: clock-names:4: 'bus' was expected
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Acked-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks,
Conor.

> ---
>  Documentation/devicetree/bindings/mmc/sdhci-msm.yaml | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
> index 10f34aa8ba8a..69a213965089 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
> @@ -85,10 +85,10 @@ properties:
>        - const: iface
>        - const: core
>        - const: xo
> -      - const: ice
> -      - const: bus
> -      - const: cal
> -      - const: sleep
> +      - enum: [ice, bus, cal, sleep]
> +      - enum: [ice, bus, cal, sleep]
> +      - enum: [ice, bus, cal, sleep]
> +      - enum: [ice, bus, cal, sleep]
>  
>    dma-coherent: true
>  
> -- 
> 2.34.1
> 

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