linux-kernel - Re: [PATCH] arm64: dts: qcom: lemans: add DT changes to enable MDSS1 and DPU

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Message-ID: <b1c12696-9e08-47f4-8fd0-11e415af187b@oss.qualcomm.com>
Date: Thu, 25 Sep 2025 12:49:48 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Mahadevan <mahadevan.p@....qualcomm.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>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: lemans: add DT changes to enable MDSS1
 and DPU

On 9/25/25 10:58 AM, Mahadevan wrote:
> Add devicetree changes to enable second Mobile Display
> Subsystem (MDSS1) and its Display Processing Unit(DPU) for
> Qualcomm LEMANS platform.

No need to scream.. "lemans" or "LeMans"> 
> Signed-off-by: Mahadevan <mahadevan.p@....qualcomm.com>

Please include your full name in git config

> ---
>  arch/arm64/boot/dts/qcom/lemans.dtsi | 88 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 88 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/lemans.dtsi b/arch/arm64/boot/dts/qcom/lemans.dtsi
> index 48f753002fc459a3e9fac0c0e98cbec6013fea0f..45c11c050d3f8853701fd20cf647aef5c6a9a8c9 100644
> --- a/arch/arm64/boot/dts/qcom/lemans.dtsi
> +++ b/arch/arm64/boot/dts/qcom/lemans.dtsi
> @@ -6751,6 +6751,94 @@ compute-cb@3 {
>  			};
>  		};
>  
> +		mdss1: display-subsystem@...00000 {
> +			compatible = "qcom,sa8775p-mdss";
> +			reg = <0x0 0x22000000 0x0 0x1000>;
> +			reg-names = "mdss";
> +
> +			/* same path used twice */

this comment is misleading

> +			interconnects = <&mmss_noc MASTER_MDP_CORE1_0 QCOM_ICC_TAG_ALWAYS
> +					 &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
> +					<&mmss_noc MASTER_MDP_CORE1_1 QCOM_ICC_TAG_ALWAYS
> +					 &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
> +					<&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";
> +
> +			resets = <&dispcc1 MDSS_DISP_CC_MDSS_CORE_BCR>;
> +
> +			power-domains = <&dispcc1 MDSS_DISP_CC_MDSS_CORE_GDSC>;
> +
> +			clocks = <&dispcc1 MDSS_DISP_CC_MDSS_AHB_CLK>,
> +				 <&gcc GCC_DISP1_HF_AXI_CLK>,
> +				 <&dispcc1 MDSS_DISP_CC_MDSS_MDP_CLK>;
> +
> +			interrupts = <GIC_SPI 865 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-controller;
> +			#interrupt-cells = <1>;
> +
> +			iommus = <&apps_smmu 0x1800 0x402>;
> +
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			ranges;
> +
> +			status = "disabled";
> +
> +			mdss1_mdp: display-controller@...01000 {
> +				compatible = "qcom,sa8775p-dpu";

Adding nothing more but the DPU isn't very useful at all
and doesn't really let you test the hardware (since you don't
provide a sink)

Konrad