linux-kernel - Re: [v4] arm64: dts: sc7180: add display dt nodes

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Date:   Tue, 28 Jan 2020 12:32:22 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Harigovindan P <harigovi@...eaurora.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        seanpaul@...omium.org, hoegsberg@...omium.org,
        kalyan_t@...eaurora.org, nganji@...eaurora.org
Subject: Re: [v4] arm64: dts: sc7180: add display dt nodes

Hi,

On Tue, Jan 28, 2020 at 06:54:44PM +0530, Harigovindan P wrote:
> Add display, DSI hardware DT nodes for sc7180.
> 
> Signed-off-by: Harigovindan P <harigovi@...eaurora.org>
> ---
> 
> Changes in v1:
> 	-Added display DT nodes for sc7180
> Changes in v2:
> 	-Renamed node names
> 	-Corrected code alignments
> 	-Removed extra new line
> 	-Added DISP AHB clock for register access
> 	under display_subsystem node for global settings
> Changes in v3:
> 	-Modified node names
> 	-Modified hard coded values
> 	-Removed mdss reg entry
> Changes in v4:
> 	-Reverting mdp node name
> 	-Setting status to disabled in main SOC dtsi file
> 	-Replacing _ to - for node names
> 	-Adding clock dependency patch link
> 	-Splitting idp dt file to a separate patch
> 
> This patch has dependency on the below series
> https://lkml.org/lkml/2019/12/27/73
>  arch/arm64/boot/dts/qcom/sc7180.dtsi | 128 +++++++++++++++++++++++++++++++++++
>  1 file changed, 128 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index 3bc3f64..c3883af 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -1184,6 +1184,134 @@
>  			#power-domain-cells = <1>;
>  		};
>  
> +		mdss: mdss@...0000 {
> +			compatible = "qcom,sc7180-mdss";
> +			reg = <0 0x0ae00000 0 0x1000>;
> +			reg-names = "mdss";
> +
> +			power-domains = <&dispcc MDSS_GDSC>;
> +
> +			clocks = <&gcc GCC_DISP_AHB_CLK>,
> +				 <&gcc GCC_DISP_HF_AXI_CLK>,
> +				 <&dispcc DISP_CC_MDSS_AHB_CLK>,
> +				 <&dispcc DISP_CC_MDSS_MDP_CLK>;
> +			clock-names = "iface", "gcc_bus", "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>;
> +
> +			iommus = <&apps_smmu 0x800 0x2>;
> +
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			ranges;
> +
> +			mdss_mdp: mdp@...1000 {
> +				compatible = "qcom,sc7180-dpu";
> +				reg = <0 0x0ae01000 0 0x8f000>,
> +				      <0 0x0aeb0000 0 0x2008>,
> +				      <0 0x0af03000 0 0x16>;
> +				reg-names = "mdp", "vbif", "disp_cc";
> +
> +				clocks = <&dispcc DISP_CC_MDSS_AHB_CLK>,
> +					 <&dispcc DISP_CC_MDSS_ROT_CLK>,
> +					 <&dispcc DISP_CC_MDSS_MDP_LUT_CLK>,
> +					 <&dispcc DISP_CC_MDSS_MDP_CLK>,
> +					 <&dispcc DISP_CC_MDSS_VSYNC_CLK>;
> +				clock-names = "iface", "rot", "lut", "core",
> +					      "vsync";
> +				assigned-clocks = <&dispcc DISP_CC_MDSS_MDP_CLK>,
> +						  <&dispcc DISP_CC_MDSS_VSYNC_CLK>;
> +				assigned-clock-rates = <300000000>,
> +						       <19200000>;

The clock rate for DISP_CC_MDSS_MDP_CLK is already specified in the
parent node, do we really want/need to specify it twice?