linux-kernel - Re: [PATCH 2/3] dt-bindings: clock: qcom,gcc-sc7180: document CX power domain

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Date:   Sat, 8 Apr 2023 16:03:08 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Taniya Das <tdas@...eaurora.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Rajendra Nayak <quic_rjendra@...cinc.com>
Subject: Re: [PATCH 2/3] dt-bindings: clock: qcom,gcc-sc7180: document CX
 power domain



On 8.04.2023 15:48, Krzysztof Kozlowski wrote:
> The GCC clock controller needs CX power domain, at least according to
> DTS:
> 
>   sc7180-trogdor-pompom-r3.dtb: clock-controller@...000: Unevaluated properties are not allowed ('power-domains' was unexpected)
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
+CC Rajendra (author of 5d6fc6321db1 ("arm64: dts: qcom:
sc7180: Add required-opps for USB"))

Rajendra, shouldn't SC7180 GCC have PM ops to make sure a vote
is only there when AP is active? Are all GDSCs powered by CX?
If not, wouldn't this also need power-domain-names to
facilitate e.g. potential MX-powered ones?

Konrad
>  .../devicetree/bindings/clock/qcom,gcc-sc7180.yaml         | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/clock/qcom,gcc-sc7180.yaml b/Documentation/devicetree/bindings/clock/qcom,gcc-sc7180.yaml
> index 06dce0c6b7d0..8bf9b6f49550 100644
> --- a/Documentation/devicetree/bindings/clock/qcom,gcc-sc7180.yaml
> +++ b/Documentation/devicetree/bindings/clock/qcom,gcc-sc7180.yaml
> @@ -32,6 +32,10 @@ properties:
>        - const: bi_tcxo_ao
>        - const: sleep_clk
>  
> +  power-domains:
> +    items:
> +      - description: CX domain
> +
>  required:
>    - compatible
>    - clocks
> @@ -45,6 +49,8 @@ unevaluatedProperties: false
>  examples:
>    - |
>      #include <dt-bindings/clock/qcom,rpmh.h>
> +    #include <dt-bindings/power/qcom-rpmpd.h>
> +
>      clock-controller@...000 {
>        compatible = "qcom,gcc-sc7180";
>        reg = <0x00100000 0x1f0000>;
> @@ -52,6 +58,7 @@ examples:
>                 <&rpmhcc RPMH_CXO_CLK_A>,
>                 <&sleep_clk>;
>        clock-names = "bi_tcxo", "bi_tcxo_ao", "sleep_clk";
> +      power-domains = <&rpmhpd SC7180_CX>;
>        #clock-cells = <1>;
>        #reset-cells = <1>;
>        #power-domain-cells = <1>;