linux-kernel - Re: [PATCH v2 1/2] arm64: dts: qcom: qcs8300: add display dt nodes for MDSS, DPU, DisplayPort and eDP PHY

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Message-ID: <85d6703c-ffd2-4a57-93f2-db00f054a864@oss.qualcomm.com>
Date: Mon, 30 Dec 2024 15:34:11 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Yongxing Mou <quic_yongmou@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] arm64: dts: qcom: qcs8300: add display dt nodes
 for MDSS, DPU, DisplayPort and eDP PHY

On 26.12.2024 11:43 AM, Yongxing Mou wrote:
> Add devicetree changes to enable MDSS display-subsystem,
> display-controller(DPU), DisplayPort controller and eDP PHY for
> Qualcomm QCS8300 platform.
> 
> Signed-off-by: Yongxing Mou <quic_yongmou@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/qcs8300.dtsi | 204 +++++++++++++++++++++++++++++++++-
>  1 file changed, 203 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qcs8300.dtsi b/arch/arm64/boot/dts/qcom/qcs8300.dtsi
> index 80226992a65d867124b33dfa490c3c9ca1030c75..8d88fe4a266432f05192d7ef0dd80362bdbdab85 100644
> --- a/arch/arm64/boot/dts/qcom/qcs8300.dtsi
> +++ b/arch/arm64/boot/dts/qcom/qcs8300.dtsi
> @@ -952,6 +952,206 @@ camcc: clock-controller@...0000 {
>  			#power-domain-cells = <1>;
>  		};
>  
> +		mdss: display-subsystem@...0000 {
> +			compatible = "qcom,qcs8300-mdss";
> +			reg = <0x0 0x0ae00000 0x0 0x1000>;
> +			reg-names = "mdss";
> +
> +			interconnects = <&mmss_noc MASTER_MDP0 QCOM_ICC_TAG_ACTIVE_ONLY
> +					 &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ACTIVE_ONLY>,
> +					<&mmss_noc MASTER_MDP1 QCOM_ICC_TAG_ACTIVE_ONLY
> +					 &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ACTIVE_ONLY>,
> +					<&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
> +					 &config_noc SLAVE_DISPLAY_CFG QCOM_ICC_TAG_ACTIVE_ONLY>;
> +			interconnect-names = "mdp0-mem",
> +					     "mdp1-mem",
> +					     "cpu-cfg";

Only the CPU path should be ACTIVE_ONLY, the rest should be
QCOM_ICC_TAG_ALWAYS

> +
> +			resets = <&dispcc MDSS_DISP_CC_MDSS_CORE_BCR>;
> +
> +			power-domains = <&dispcc MDSS_DISP_CC_MDSS_CORE_GDSC>;
> +
> +			clocks = <&dispcc MDSS_DISP_CC_MDSS_AHB_CLK>,
> +				 <&gcc GCC_DISP_HF_AXI_CLK>,
> +				 <&dispcc MDSS_DISP_CC_MDSS_MDP_CLK>;

Please align the property order with x1e80100.dtsi

[...]

> +			mdss_dp0_phy: phy@...2a00 {
> +				compatible = "qcom,qcs8300-edp-phy", "qcom,sa8775p-edp-phy";
> +
> +				reg = <0x0 0x0aec2a00 0x0 0x19c>,
> +				      <0x0 0x0aec2200 0x0 0xec>,
> +				      <0x0 0x0aec2600 0x0 0xec>,
> +				      <0x0 0x0aec2000 0x0 0x1c8>;
> +
> +				clocks = <&dispcc MDSS_DISP_CC_MDSS_DPTX0_AUX_CLK>,
> +					 <&dispcc MDSS_DISP_CC_MDSS_AHB_CLK>;
> +				clock-names = "aux",
> +					      "cfg_ahb";
> +
> +				power-domains = <&rpmhpd RPMHPD_MMCX>;

The PHYs generally sit on a MX-like rail, please verify this

Konrad