linux-kernel - Re: [PATCH v9 1/4] dt-bindings: clock: Document external clocks for MSM8998 gcc

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Date:   Wed, 13 Nov 2019 16:50:55 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Jeffrey Hugo <jhugo@...eaurora.org>, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org, mark.rutland@....com
Cc:     agross@...nel.org, bjorn.andersson@...aro.org,
        marc.w.gonzalez@...e.fr, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v9 1/4] dt-bindings: clock: Document external clocks for
 MSM8998 gcc

Hi Jeffrey,

On 11/13/2019 2:14 AM, Jeffrey Hugo wrote:
> The global clock controller on MSM8998 can consume a number of external
> clocks.  Document them.
> 
> For 7180 and 8150, the hardware always exists, so no clocks are truly
> optional.  Therefore, simplify the binding by removing the min/max
> qualifiers to clocks.  Also, fixup an example so that dt_binding_check
> passes.
> 
> Signed-off-by: Jeffrey Hugo <jhugo@...eaurora.org>
> ---
>   .../devicetree/bindings/clock/qcom,gcc.yaml        | 47 +++++++++++++++-------
>   1 file changed, 33 insertions(+), 14 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/clock/qcom,gcc.yaml b/Documentation/devicetree/bindings/clock/qcom,gcc.yaml
> index e73a56f..2f3512b 100644
> --- a/Documentation/devicetree/bindings/clock/qcom,gcc.yaml
> +++ b/Documentation/devicetree/bindings/clock/qcom,gcc.yaml
> @@ -40,20 +40,38 @@ properties:
>          - qcom,gcc-sm8150
>   
>     clocks:
> -    minItems: 1
> -    maxItems: 3
> -    items:
> -      - description: Board XO source
> -      - description: Board active XO source
> -      - description: Sleep clock source
> +    oneOf:
> +      #qcom,gcc-sm8150
> +      #qcom,gcc-sc7180
> +      - items:
> +        - description: Board XO source
> +        - description: Board active XO source
> +        - description: Sleep clock source
> +      #qcom,gcc-msm8998
> +      - items:
> +        - description: Board XO source
> +        - description: USB 3.0 phy pipe clock
> +        - description: UFS phy rx symbol clock for pipe 0
> +        - description: UFS phy rx symbol clock for pipe 1
> +        - description: UFS phy tx symbol clock
> +        - description: PCIE phy pipe clock

Would it be possible to add an example for MSM8998?

>   
>     clock-names:
> -    minItems: 1
> -    maxItems: 3
> -    items:
> -      - const: bi_tcxo
> -      - const: bi_tcxo_ao
> -      - const: sleep_clk
> +    oneOf:
> +      #qcom,gcc-sm8150
> +      #qcom,gcc-sc7180
> +      - items:
> +        - const: bi_tcxo
> +        - const: bi_tcxo_ao
> +        - const: sleep_clk

Not required for SC7180.

> +      #qcom,gcc-msm8998
> +      - items:
> +        - const: xo
> +        - const: usb3_pipe
> +        - const: ufs_rx_symbol0
> +        - const: ufs_rx_symbol1
> +        - const: ufs_tx_symbol0
> +        - const: pcie0_pipe
>   
>     '#clock-cells':
>       const: 1
> @@ -118,6 +136,7 @@ else:
>         compatible:
>           contains:
>             enum:
> +            - qcom,gcc-msm8998
>               - qcom,gcc-sm8150
>               - qcom,gcc-sc7180
>     then:
> @@ -179,8 +198,8 @@ examples:
>       clock-controller@...000 {
>         compatible = "qcom,gcc-sc7180";
>         reg = <0x100000 0x1f0000>;
> -      clocks = <&rpmhcc 0>, <&rpmhcc 1>;
> -      clock-names = "bi_tcxo", "bi_tcxo_ao";
> +      clocks = <&rpmhcc 0>, <&rpmhcc 1>, <0>;
> +      clock-names = "bi_tcxo", "bi_tcxo_ao", "sleep_clk";

SC7180 does not require a sleep clock.

>         #clock-cells = <1>;
>         #reset-cells = <1>;
>         #power-domain-cells = <1>;
> 

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