linux-kernel - Re: [PATCH v4 1/4] arm64: dts: qcom: sc7280: add display dt nodes

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Message-ID: <YaeUCK5+P8DrEM41@builder.lan>
Date:   Wed, 1 Dec 2021 09:26:00 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sankeerth Billakanti <quic_sbillaka@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, agross@...nel.org, robh+dt@...nel.org,
        Krishna Manikandan <quic_mkrishn@...cinc.com>,
        robdclark@...il.com, seanpaul@...omium.org, swboyd@...omium.org,
        quic_kalyant@...cinc.com, quic_abhinavk@...cinc.com,
        dianders@...omium.org, quic_khsieh@...cinc.com
Subject: Re: [PATCH v4 1/4] arm64: dts: qcom: sc7280: add display dt nodes

On Mon 22 Nov 05:26 CST 2021, Sankeerth Billakanti wrote:

> From: Krishna Manikandan <quic_mkrishn@...cinc.com>
> 
> Add mdss and mdp DT nodes for sc7280.
> 
> Signed-off-by: Krishna Manikandan <quic_mkrishn@...cinc.com>
> Reported-by: kernel test robot <lkp@...el.com>
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
> ---
> 
> Changes in v4:
>     None
> 
> Changes in v3:
>     None
> 
> Changes in v2:
>     - Rename display dt nodes (Stephen Boyd)
>     - Add clock names one per line for readability (Stephen Boyd)
> 
> 
>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 90 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 90 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index 365a2e0..a4536b6 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -2704,6 +2704,96 @@
>  			#power-domain-cells = <1>;
>  		};
>  
> +		mdss: display-subsystem@...0000 {
> +			compatible = "qcom,sc7280-mdss";
> +			reg = <0 0x0ae00000 0 0x1000>;
> +			reg-names = "mdss";
> +
> +			power-domains = <&dispcc DISP_CC_MDSS_CORE_GDSC>;
> +
> +			clocks = <&gcc GCC_DISP_AHB_CLK>,
> +				 <&dispcc DISP_CC_MDSS_AHB_CLK>,
> +				<&dispcc DISP_CC_MDSS_MDP_CLK>;
> +			clock-names = "iface",
> +				      "ahb",
> +				      "core";
> +
> +			assigned-clocks = <&dispcc DISP_CC_MDSS_MDP_CLK>;
> +			assigned-clock-rates = <300000000>;
> +
> +			interrupts = <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-controller;
> +			#interrupt-cells = <1>;
> +
> +			interconnects = <&mmss_noc MASTER_MDP0 0 &mc_virt SLAVE_EBI1 0>;
> +			interconnect-names = "mdp0-mem";
> +
> +			iommus = <&apps_smmu 0x900 0x402>;
> +
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			ranges;
> +
> +			status = "disabled";
> +
> +			mdp: display-controller@...1000 {

I believe the only reason to give this a label is so that you can enable
it in the dts. But I don't see the point of having it status disabled,
given that it should always follow the mdss node's status.

> +				compatible = "qcom,sc7280-dpu";
> +				reg = <0 0x0ae01000 0 0x8f030>,
> +					<0 0x0aeb0000 0 0x2008>;
> +				reg-names = "mdp", "vbif";
> +
> +				clocks = <&gcc GCC_DISP_HF_AXI_CLK>,
> +					<&gcc GCC_DISP_SF_AXI_CLK>,
> +					<&dispcc DISP_CC_MDSS_AHB_CLK>,
> +					<&dispcc DISP_CC_MDSS_MDP_LUT_CLK>,
> +					<&dispcc DISP_CC_MDSS_MDP_CLK>,
> +					<&dispcc DISP_CC_MDSS_VSYNC_CLK>;
> +				clock-names = "bus",
> +					      "nrt_bus",
> +					      "iface",
> +					      "lut",
> +					      "core",
> +					      "vsync";
> +				assigned-clocks = <&dispcc DISP_CC_MDSS_MDP_CLK>,
> +						<&dispcc DISP_CC_MDSS_VSYNC_CLK>,
> +						<&dispcc DISP_CC_MDSS_AHB_CLK>;
> +				assigned-clock-rates = <300000000>,
> +							<19200000>,
> +							<19200000>;
> +				operating-points-v2 = <&mdp_opp_table>;
> +				power-domains = <&rpmhpd SC7280_CX>;
> +
> +				interrupt-parent = <&mdss>;
> +				interrupts = <0>;
> +
> +				status = "disabled";

So my suggestion is to drop this and drop the label.

If not, please change the label of this node to mdss_mdp, for sorting
purposes.

Thanks,
Bjorn

> +
> +				mdp_opp_table: opp-table {
> +					compatible = "operating-points-v2";
> +
> +					opp-200000000 {
> +						opp-hz = /bits/ 64 <200000000>;
> +						required-opps = <&rpmhpd_opp_low_svs>;
> +					};
> +
> +					opp-300000000 {
> +						opp-hz = /bits/ 64 <300000000>;
> +						required-opps = <&rpmhpd_opp_svs>;
> +					};
> +
> +					opp-380000000 {
> +						opp-hz = /bits/ 64 <380000000>;
> +						required-opps = <&rpmhpd_opp_svs_l1>;
> +					};
> +
> +					opp-506666667 {
> +						opp-hz = /bits/ 64 <506666667>;
> +						required-opps = <&rpmhpd_opp_nom>;
> +					};
> +				};
> +			};
> +		};
> +
>  		pdc: interrupt-controller@...0000 {
>  			compatible = "qcom,sc7280-pdc", "qcom,pdc";
>  			reg = <0 0x0b220000 0 0x30000>;
> -- 
> 2.7.4
>