linux-kernel - Re: [PATCH v2 2/3] arm64: dts: qcom: lemans: add mdss1 display device nodes

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Message-ID: <cndguco6ijb666ugbqpbffyhbbgs2nyno3qujuevz5dnpegir3@ygkh7vctnzuj>
Date: Wed, 10 Dec 2025 10:30:39 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Mani Chandana Ballary Kuntumalla <quic_mkuntuma@...cinc.com>
Cc: marijn.suijten@...ainline.org, swboyd@...omium.org, mripard@...nel.org,
        abel.vesa@...aro.org, andersson@...nel.org, konradybcio@...nel.org,
        robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
        robin.clark@....qualcomm.com, jessica.zhang@....qualcomm.com,
        abhinav.kumar@...ux.dev, sean@...rly.run, airlied@...il.com,
        simona@...ll.ch, alex.vinarskis@...il.com,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        quic_rajeevny@...cinc.com, quic_vproddut@...cinc.com,
        quic_riteshk@...cinc.com, quic_amitsi@...cinc.com,
        Mahadevan P <mahadevan.p@....qualcomm.com>
Subject: Re: [PATCH v2 2/3] arm64: dts: qcom: lemans: add mdss1 display
 device nodes

On Tue, Nov 25, 2025 at 04:26:21PM +0530, Mani Chandana Ballary Kuntumalla wrote:
> Add devicetree changes to enable second Mobile Display Subsystem (mdss1),
> Display Processing Unit(DPU), Display Port(DP) controllers and eDP PHYs
> on the Qualcomm Lemans platform.
> 
> Signed-off-by: Mahadevan P <mahadevan.p@....qualcomm.com>
> Signed-off-by: Mani Chandana Ballary Kuntumalla <quic_mkuntuma@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/lemans.dtsi | 338 ++++++++++++++++++++++++++-
>  1 file changed, 336 insertions(+), 2 deletions(-)
> 
> +
> +				mdss1_dp_opp_table: opp-table {

Why do we need two instances of the table?

> +					compatible = "operating-points-v2";
> +
> +					opp-160000000 {
> +						opp-hz = /bits/ 64 <160000000>;
> +						required-opps = <&rpmhpd_opp_low_svs>;
> +					};
> +
> +					opp-270000000 {
> +						opp-hz = /bits/ 64 <270000000>;
> +						required-opps = <&rpmhpd_opp_svs>;
> +					};
> +
> +					opp-540000000 {
> +						opp-hz = /bits/ 64 <540000000>;
> +						required-opps = <&rpmhpd_opp_svs_l1>;
> +					};
> +
> +					opp-810000000 {
> +						opp-hz = /bits/ 64 <810000000>;
> +						required-opps = <&rpmhpd_opp_nom>;
> +					};
> +				};
> +			};
> +
> +				mdss1_dp1_opp_table: opp-table {
> +					compatible = "operating-points-v2";
> +
> +					opp-160000000 {
> +						opp-hz = /bits/ 64 <160000000>;
> +						required-opps = <&rpmhpd_opp_low_svs>;
> +					};
> +
> +					opp-270000000 {
> +						opp-hz = /bits/ 64 <270000000>;
> +						required-opps = <&rpmhpd_opp_svs>;
> +					};
> +
> +					opp-540000000 {
> +						opp-hz = /bits/ 64 <540000000>;
> +						required-opps = <&rpmhpd_opp_svs_l1>;
> +					};
> +
> +					opp-810000000 {
> +						opp-hz = /bits/ 64 <810000000>;
> +						required-opps = <&rpmhpd_opp_nom>;
> +					};
> +				};
> +			};
> +		};
> +

-- 
With best wishes
Dmitry