linux-kernel - Re: [PATCH v5 1/2] arm64: dts: qcom: Add display support for QCS615

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Message-ID: <1f6fc7ce-5826-4f59-89d7-ac691a3ae785@oss.qualcomm.com>
Date: Tue, 29 Jul 2025 13:17:39 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Fange Zhang <fange.zhang@....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>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Xiangxu Yin <xiangxu.yin@....qualcomm.com>,
        Li Liu <quic_lliu6@...cinc.com>, Dmitry Baryshkov <lumag@...nel.org>
Subject: Re: [PATCH v5 1/2] arm64: dts: qcom: Add display support for QCS615

On 7/18/25 2:56 PM, Fange Zhang wrote:
> From: Li Liu <quic_lliu6@...cinc.com>
> 
> Add display MDSS and DSI configuration for QCS615 platform.
> QCS615 has a DP port, and DP support will be added in a later patch.
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Li Liu <quic_lliu6@...cinc.com>
> Signed-off-by: Fange Zhang <fange.zhang@....qualcomm.com>
> ---

[...]

> +
> +			mdss_mdp: display-controller@...1000 {
> +				compatible = "qcom,sm6150-dpu";
> +				reg = <0x0 0x0ae01000 0x0 0x8f000>,
> +				      <0x0 0x0aeb0000 0x0 0x2008>;
> +				reg-names = "mdp", "vbif";
> +
> +				clocks = <&dispcc DISP_CC_MDSS_AHB_CLK>,
> +					 <&gcc GCC_DISP_HF_AXI_CLK>,
> +					 <&dispcc DISP_CC_MDSS_MDP_CLK>,
> +					 <&dispcc DISP_CC_MDSS_VSYNC_CLK>;
> +				clock-names = "iface", "bus", "core", "vsync";

1 per line please, everywhere> +
> +				assigned-clocks = <&dispcc DISP_CC_MDSS_VSYNC_CLK>;
> +				assigned-clock-rates = <19200000>;

Is this necessary?

> +
> +				operating-points-v2 = <&mdp_opp_table>;
> +				power-domains = <&rpmhpd RPMHPD_CX>;
> +
> +				interrupt-parent = <&mdss>;
> +				interrupts = <0>;

interrupts-extended

> +
> +				ports {
> +					#address-cells = <1>;
> +					#size-cells = <0>;
> +
> +					port@0 {
> +						reg = <0>;

Please keep a \n between properties and subnodes

> +						dpu_intf0_out: endpoint {
> +						};
> +					};
> +
> +					port@1 {
> +						reg = <1>;
> +						dpu_intf1_out: endpoint {
> +							remote-endpoint = <&mdss_dsi0_in>;
> +						};
> +					};
> +				};
> +
> +				mdp_opp_table: opp-table {
> +					compatible = "operating-points-v2";
> +
> +					opp-19200000 {
> +						opp-hz = /bits/ 64 <19200000>;
> +						required-opps = <&rpmhpd_opp_low_svs>;
> +					};
> +
> +					opp-25600000 {
> +						opp-hz = /bits/ 64 <25600000>;
> +						required-opps = <&rpmhpd_opp_svs>;

This and the above frequency are missing one zero (i.e. you
have a 10x underclock)

[...]

> +			mdss_dsi0_phy: phy@...4400 {
> +				compatible = "qcom,sm6150-dsi-phy-14nm";
> +				reg = <0x0 0x0ae94400 0x0 0x100>,
> +				      <0x0 0x0ae94500 0x0 0x300>,
> +				      <0x0 0x0ae94800 0x0 0x188>;

sz = 0x124

> +				reg-names = "dsi_phy",
> +					    "dsi_phy_lane",
> +					    "dsi_pll";
> +
> +				#clock-cells = <1>;
> +				#phy-cells = <0>;
> +
> +				clocks = <&dispcc DISP_CC_MDSS_AHB_CLK>,
> +					 <&rpmhcc RPMH_CXO_CLK>;
> +				clock-names = "iface", "ref";
> +
> +				status = "disabled";
> +			};
> +		};
> +
>  		dispcc: clock-controller@...0000 {
>  			compatible = "qcom,qcs615-dispcc";
>  			reg = <0 0x0af00000 0 0x20000>;
>  
>  			clocks = <&rpmhcc RPMH_CXO_CLK>,
> -				 <&gcc GCC_DISP_GPLL0_DIV_CLK_SRC>;
> +				 <&gcc GCC_DISP_GPLL0_DIV_CLK_SRC>,
> +				 <&mdss_dsi0_phy 0>,
> +				 <&mdss_dsi0_phy 1>,

#include <dt-bindings/clock/qcom,dsi-phy-28nm.h>

Konrad