linux-kernel - Re: [PATCH] arm64: dts: qcom: qcs6490-rb3gen2: Declare GCC clocks protected

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Message-ID: <CAA8EJpr987frG7rpceybSmg8TFj-OsQeoRKBdLT=dnTbfzruKQ@mail.gmail.com>
Date: Fri, 9 Feb 2024 20:01:15 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bjorn Andersson <quic_bjorande@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, Taniya Das <quic_tdas@...cinc.com>, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: qcs6490-rb3gen2: Declare GCC clocks protected

On Fri, 9 Feb 2024 at 18:21, Bjorn Andersson <quic_bjorande@...cinc.com> wrote:
>
> The SC7180 GCC binding describes clocks which, due to the difference in
> security model, are not accessible on the RB3gen2 - in the same way seen
> on QCM6490.
>
> Mark these clocks as protected, to allow the board to boot.
>
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
> I did notice Taniya's patch [1] after writing this patch. I'd prefer to
> merge this minimal set asap, to make the board boot, unless there's a
> strong argument for including those other clocks in the protected list.
>
> [1] https://lore.kernel.org/linux-arm-msm/20240208062836.19767-6-quic_tdas@quicinc.com/
> ---
>  arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> index 8bb7d13d85f6..97b1586f9f19 100644
> --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> @@ -413,6 +413,24 @@ vreg_bob_3p296: bob {
>         };
>  };
>
> +&gcc {
> +       protected-clocks = <GCC_CFG_NOC_LPASS_CLK>,
> +                          <GCC_EDP_CLKREF_EN>,

I'd say these two clocks looks strange in this list, but you probably
know what you are doing. Thus:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> +                          <GCC_MSS_CFG_AHB_CLK>,
> +                          <GCC_MSS_GPLL0_MAIN_DIV_CLK_SRC>,
> +                          <GCC_MSS_OFFLINE_AXI_CLK>,
> +                          <GCC_MSS_Q6SS_BOOT_CLK_SRC>,
> +                          <GCC_MSS_Q6_MEMNOC_AXI_CLK>,
> +                          <GCC_MSS_SNOC_AXI_CLK>,
> +                          <GCC_QSPI_CNOC_PERIPH_AHB_CLK>,
> +                          <GCC_QSPI_CORE_CLK>,
> +                          <GCC_QSPI_CORE_CLK_SRC>,
> +                          <GCC_SEC_CTRL_CLK_SRC>,
> +                          <GCC_WPSS_AHB_BDG_MST_CLK>,
> +                          <GCC_WPSS_AHB_CLK>,
> +                          <GCC_WPSS_RSCP_CLK>;
> +};
> +
>  &qupv3_id_0 {
>         status = "okay";
>  };
>
> ---
> base-commit: b1d3a0e70c3881d2f8cf6692ccf7c2a4fb2d030d
> change-id: 20240209-qcm6490-gcc-protected-clocks-ee5fafdb76b3
>
> Best regards,
> --
> Bjorn Andersson <quic_bjorande@...cinc.com>
>


-- 
With best wishes
Dmitry