linux-kernel - Re: [PATCH 3/4] arm64: dts: sdm845: Add DSI and MDP OPP tables and power-domains

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Date:   Wed, 1 Jul 2020 08:06:19 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     robdclark@...il.com, sean@...rly.run, agross@...nel.org,
        bjorn.andersson@...aro.org, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] arm64: dts: sdm845: Add DSI and MDP OPP tables and
 power-domains

On Tue, Jun 30, 2020 at 05:26:15PM +0530, Rajendra Nayak wrote:
> Add the OPP tables for DSI and MDP based on the perf state/clk
> requirements, and add the power-domains property to specify the
> scalable power domain.
> 
> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> ---
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 59 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 59 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index 8eb5a31..b6afeb2 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -3296,6 +3296,35 @@
>  			#power-domain-cells = <1>;
>  		};
>  
> +		dsi_opp_table: dsi-opp-table {
> +			compatible = "operating-points-v2";
> +
> +			opp-19200000 {
> +				opp-hz = /bits/ 64 <19200000>;
> +				required-opps = <&rpmhpd_opp_min_svs>;
> +			};
> +
> +			opp-180000000 {
> +				opp-hz = /bits/ 64 <180000000>;
> +				required-opps = <&rpmhpd_opp_low_svs>;
> +			};
> +
> +			opp-275000000 {
> +				opp-hz = /bits/ 64 <275000000>;
> +				required-opps = <&rpmhpd_opp_svs>;
> +			};
> +
> +			opp-328580000 {
> +				opp-hz = /bits/ 64 <328580000>;
> +				required-opps = <&rpmhpd_opp_svs_l1>;
> +			};
> +
> +			opp-358000000 {
> +				opp-hz = /bits/ 64 <358000000>;
> +				required-opps = <&rpmhpd_opp_nom>;
> +			};
> +		};
> +

I still don't like the shared OPP tables to be positioned inmidst of the
device nodes, but it seems we currently don't have a better convention.

>  		mdss: mdss@...0000 {
>  			compatible = "qcom,sdm845-mdss";
>  			reg = <0 0x0ae00000 0 0x1000>;
> @@ -3340,6 +3369,8 @@
>  						  <&dispcc DISP_CC_MDSS_VSYNC_CLK>;
>  				assigned-clock-rates = <300000000>,
>  						       <19200000>;
> +				operating-points-v2 = <&mdp_opp_table>;
> +				power-domains = <&rpmhpd SDM845_CX>;
>  
>  				interrupt-parent = <&mdss>;
>  				interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
> @@ -3364,6 +3395,30 @@
>  						};
>  					};
>  				};
> +
> +				mdp_opp_table: mdp-opp-table {
> +					compatible = "operating-points-v2";
> +
> +					opp-19200000 {
> +						opp-hz = /bits/ 64 <19200000>;
> +						required-opps = <&rpmhpd_opp_min_svs>;
> +					};
> +
> +					opp-171428571 {
> +						opp-hz = /bits/ 64 <171428571>;
> +						required-opps = <&rpmhpd_opp_low_svs>;
> +					};
> +
> +					opp-344000000 {
> +						opp-hz = /bits/ 64 <344000000>;
> +						required-opps = <&rpmhpd_opp_svs_l1>;
> +					};
> +
> +					opp-430000000 {
> +						opp-hz = /bits/ 64 <430000000>;
> +						required-opps = <&rpmhpd_opp_nom>;
> +					};
> +				};
>  			};
>  
>  			dsi0: dsi@...4000 {
> @@ -3386,6 +3441,8 @@
>  					      "core",
>  					      "iface",
>  					      "bus";
> +				operating-points-v2 = <&dsi_opp_table>;
> +				power-domains = <&rpmhpd SDM845_CX>;
>  
>  				phys = <&dsi0_phy>;
>  				phy-names = "dsi";
> @@ -3450,6 +3507,8 @@
>  					      "core",
>  					      "iface",
>  					      "bus";
> +				operating-points-v2 = <&dsi_opp_table>;
> +				power-domains = <&rpmhpd SDM845_CX>;
>  
>  				phys = <&dsi1_phy>;
>  				phy-names = "dsi";

Reviewed-by: Matthias Kaehlcke <mka@...omium.org>