linux-kernel - Re: [PATCH v2 1/8] dt-bindings: phy: qcom,qmp: Mark '#clock-cells' as a 'optional' property

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Date:   Tue, 1 Mar 2022 11:55:14 +0800
From:   Shawn Guo <shawn.guo@...aro.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, bhupesh.linux@...il.com,
        agross@...nel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, vkoul@...nel.org,
        linux-phy@...ts.infradead.org, robh+dt@...nel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH v2 1/8] dt-bindings: phy: qcom,qmp: Mark '#clock-cells'
 as a 'optional' property

On Mon, Feb 28, 2022 at 06:00:12PM +0530, Bhupesh Sharma wrote:
> Since '#clock-cells' is not a required property for qmp-phy(s)
> (atleast in the '/' node, but is used in 'phy@' subnode),
> so mark it as an optional property instead.

My understanding is that '#clock-cells' shouldn't be a property of qmp-phy
node itself at all (not even optional), but a required property of 'phy'
subnode.

> 
> This fixes the following 'make dtbs_check' warning(s):
> 
> sm8350-microsoft-surface-duo2.dt.yaml: phy@...7000:
>   '#clock-cells' is a required property
> 
> Also, make the dt-bindings confirm to changes
> already made via commit 82d61e19fccb ("arm64: dts: qcom: msm8996:
>  Move '#clock-cells' to QMP PHY child node"), by moving
> '#clock-cells' property from the '/' node to the 'phy@' subnode.
> 
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Vinod Koul <vkoul@...nel.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
>  Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> index e417cd667997..48cd6b6171a1 100644
> --- a/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> @@ -63,9 +63,6 @@ properties:
>        - description: Address and length of PHY's common serdes block.
>        - description: Address and length of PHY's DP_COM control block.
>  
> -  "#clock-cells":
> -    enum: [ 1, 2 ]
> -
>    "#address-cells":
>      enum: [ 1, 2 ]
>  
> @@ -109,11 +106,13 @@ patternProperties:
>      description:
>        Each device node of QMP phy is required to have as many child nodes as
>        the number of lanes the PHY has.
> +    properties:
> +      "#clock-cells":
> +        enum: [ 0, 1, 2 ]

I'm not sure how to specify this is a required property for the child
node.  Or is this already the case, @Rob?

>  
>  required:
>    - compatible
>    - reg
> -  - "#clock-cells"
>    - "#address-cells"
>    - "#size-cells"
>    - ranges
> @@ -461,7 +460,6 @@ examples:
>      usb_2_qmpphy: phy-wrapper@...b000 {
>          compatible = "qcom,sdm845-qmp-usb3-uni-phy";
>          reg = <0x088eb000 0x18c>;
> -        #clock-cells = <1>;

These two changes look good to me.

Shawn

>          #address-cells = <1>;
>          #size-cells = <1>;
>          ranges = <0x0 0x088eb000 0x2000>;
> -- 
> 2.35.1
>