linux-kernel - Re: [PATCH v2] arm64: dts: qcom: qcs6490-rb3gen2: Declare GCC clocks protected

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Message-ID: <CAA8EJpr+J6P_Ew96u-VwcZXR2sRd=T4JjT3z9pOTaqzSKxVvuw@mail.gmail.com>
Date: Sat, 10 Feb 2024 13:38:22 +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, Luca Weiss <luca.weiss@...rphone.com>
Subject: Re: [PATCH v2] arm64: dts: qcom: qcs6490-rb3gen2: Declare GCC clocks protected

On Sat, 10 Feb 2024 at 01:21, Bjorn Andersson <quic_bjorande@...cinc.com> wrote:
>
> The SC7280 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. In contrast
> to the present QCM6490 boards GCC_EDP_CLKREF_EN is left out, as this
> does not need to be "protected" and is used on the RB3Gen2 board.
>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Reviewed-by: Luca Weiss <luca.weiss@...rphone.com>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> 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/
> ---
> Changes in v2:
> - Dropped GCC_EDP_CLKREF_EN from the list and expanded the commit
>   message to cover this descrepancy from QCM6490 devices.
> - Corrected SC7180 to SC7280 in commit message.
> - Link to v1: https://lore.kernel.org/r/20240209-qcm6490-gcc-protected-clocks-v1-1-bd3487b2e7b1@quicinc.com
> ---
>  arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> index 8bb7d13d85f6..ebbe2c1123f6 100644
> --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> @@ -413,6 +413,23 @@ vreg_bob_3p296: bob {
>         };
>  };
>
> +&gcc {
> +       protected-clocks = <GCC_CFG_NOC_LPASS_CLK>,
> +                          <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>;
> +};

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

Nit: I really suppose that parts like this should go to the common
qcm6490.dtsi file, if it gets duplicated between IDP and RB3g2 boards.

> +
>  &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