linux-kernel - Re: [PATCH 3/4] ARM: dts: rockchip: add display nodes for rk322x

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Date:   Fri, 14 Jun 2019 10:45:25 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Heiko Stuebner <heiko@...ech.de>,
        linux-rockchip@...ts.infradead.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        justin.swartz@...ingedge.co.za, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, mturquette@...libre.com,
        Heiko Stuebner <heiko@...ech.de>
Subject: Re: [PATCH 3/4] ARM: dts: rockchip: add display nodes for rk322x

Quoting Heiko Stuebner (2019-06-14 09:54:53)
> From: Justin Swartz <justin.swartz@...ingedge.co.za>
> 
> Add display_subsystem, hdmi_phy, vop, and hdmi device nodes plus
> a few hdmi pinctrl entries to allow for HDMI output.
> 
> Signed-off-by: Justin Swartz <justin.swartz@...ingedge.co.za>
> [added assigned-clock settings for hdmiphy output]
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> ---
>  arch/arm/boot/dts/rk322x.dtsi | 83 +++++++++++++++++++++++++++++++++++
>  1 file changed, 83 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/rk322x.dtsi b/arch/arm/boot/dts/rk322x.dtsi
> index da102fff96a2..148f9b5157ea 100644
> --- a/arch/arm/boot/dts/rk322x.dtsi
> +++ b/arch/arm/boot/dts/rk322x.dtsi
> @@ -143,6 +143,11 @@
>                 #clock-cells = <0>;
>         };
>  
> +       display_subsystem: display-subsystem {
> +               compatible = "rockchip,display-subsystem";
> +               ports = <&vop_out>;
> +       };
> +

What is this? It doesn't have a reg property so it looks like a virtual
device. Why is it in DT?