linux-kernel - Re: [PATCH v2 1/4] arm64: dts: ti: k3-am62-main: Add node for Display SubSystem

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Date:   Fri, 17 Jun 2022 20:11:37 -0500
From:   Nishanth Menon <nm@...com>
To:     Aradhya Bhatia <a-bhatia1@...com>
CC:     Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Rahul T R <r-ravikumar@...com>
Subject: Re: [PATCH v2 1/4] arm64: dts: ti: k3-am62-main: Add node for
 Display SubSystem

On 19:13-20220505, Aradhya Bhatia wrote:
> Add DT node for the Display SubSystem on the am62x soc in cbass_main.
> The DSS IP on this soc is compatible with the one on the am65x soc.
> 
> The DSS supports one each of video pipeline (vid) and video-lite
> pipeline (vidl1). It outputs OLDI signals on one video port (vp1) and
> DPI signals on another (vp2). The video ports are connected to the
> pipelines via 2 identical overlay managers (ovr1 and ovr2).
> 
> Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
> Reviewed-by: Rahul T R <r-ravikumar@...com>
> ---
>  arch/arm64/boot/dts/ti/k3-am62-main.dtsi | 30 ++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> index eec8dae65e7c..ff21efa4ffad 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> @@ -515,6 +515,36 @@ cpts@...00 {
>  		};
>  	};
>  
> +	dss: dss@...00000 {
> +		compatible = "ti,am65x-dss";


After looking closer at DSS last few days, the OLDI is unfortunately
different on AM62x.

Even though DPI interface works fine, OLDI TX integration needs a
separate compatible.

I suggest sending a patch introducing ti,am625-dss compatible.

I will need to drop the entire series - if we can get the compatible
integrated to master, i can pick the dts updates in the rc1 after.

[...]

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D