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From: Stephen Boyd <sboyd@kernel.org>
To: Heiko Stuebner <heiko@sntech.de>,
	Justin Swartz <justin.swartz@risingedge.co.za>
Cc: linux-rockchip@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
	mturquette@baylibre.com
Subject: Re: [PATCH 3/4] ARM: dts: rockchip: add display nodes for rk322x
Date: Fri, 14 Jun 2019 13:36:09 -0700
Message-ID: <20190614203610.959DA217F9@mail.kernel.org> (raw)
In-Reply-To: <13456600.FWPkgmLa5g@phil>

Quoting Heiko Stuebner (2019-06-14 12:33:12)
> Am Freitag, 14. Juni 2019, 20:32:35 CEST schrieb Justin Swartz:
> > On 2019-06-14 19:45, Stephen Boyd wrote:
> > >> 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?
> > 
> > This is a virtual device.
> > 
> > I assumed it would be acceptable to it find in a device tree due to 
> > binding documentation, 
> > "Documentation/devicetree/bindings/display/rockchip/rockchip-drm.txt, 
> > which states:
> > 
> > <quote>
> > The Rockchip DRM master device is a virtual device needed to list all
> > vop devices or other display interface nodes that comprise the
> > graphics subsystem.
> > </quote>
> > 
> > Without the "display_subsystem" device node, the HDMI PHY and 
> > rockchipdrmfb frame buffer device are not initialized.
> > 
> > Perhaps I should have included this in my commit message? :)
> 
> As Justin said, that is very much common as the root of the components
> that make up the drm device and pretty much common in a lot of devicetrees
> for the last 5 years and longer ;-) .
> 
> Also gpio-keys also don't have a reg property ;-) .
> 

Do you have a SoC node? If so, this virtual device should live in the
root, away from the nodes that have reg properties and are thus in the
SoC node.


  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14 16:54 [PATCH 0/4] hdmi on rk3229 Heiko Stuebner
2019-06-14 16:54 ` [PATCH 1/4] clk: rockchip: add clock id for hdmi_phy special clock Heiko Stuebner
2019-06-14 20:38   ` Justin Swartz
2019-06-14 16:54 ` [PATCH 2/4] clk: rockchip: export HDMIPHY clock Heiko Stuebner
2019-06-14 20:38   ` Justin Swartz
2019-06-14 16:54 ` [PATCH 3/4] ARM: dts: rockchip: add display nodes for rk322x Heiko Stuebner
2019-06-14 17:45   ` Stephen Boyd
2019-06-14 18:32     ` Justin Swartz
2019-06-14 19:33       ` Heiko Stuebner
2019-06-14 20:36         ` Stephen Boyd [this message]
2019-06-14 23:05           ` Heiko Stuebner
2019-06-14 16:54 ` [PATCH 4/4] ARM: dts: rockchip: fix vop iommu-cells on rk322x Heiko Stuebner

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