linux-kernel - Re: [PATCH 15/15] arm64: dts: qcom: sm6115: Add VDD_CX to GPU

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Date:   Mon, 17 Jul 2023 18:28:39 +0200
From:   Stephan Gerhold <stephan@...hold.net>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...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>,
        Conor Dooley <conor+dt@...nel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 15/15] arm64: dts: qcom: sm6115: Add VDD_CX to GPU_CCC

On Mon, Jul 17, 2023 at 05:19:22PM +0200, Konrad Dybcio wrote:
> The GPU_CC block is powered by VDD_CX. Describe that.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> index 29b5b388cd94..bfaaa1801a4d 100644
> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> @@ -1430,6 +1430,8 @@ gpucc: clock-controller@...0000 {
>  			clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
>  				 <&gcc GCC_GPU_GPLL0_CLK_SRC>,
>  				 <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
> +			power-domains = <&rpmpd SM6115_VDDCX>;
> +			required-opps = <&rpmpd_opp_low_svs>;

Where is this required-opp coming from? The clocks in gpucc seem to have
different voltage requirements depending on the rates, but we usually
handle that in the OPP tables of the consumer.

Thanks,
Stephan