linux-kernel - Re: [PATCH 4/6] dt-bindings: display: armada: Add display subsystem binding

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Date:   Wed, 13 Feb 2019 23:37:30 +0100
From:   Lubomir Rintel <lkundrak@...sk>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/6] dt-bindings: display: armada: Add display subsystem
 binding

On Mon, 2019-01-21 at 09:35 -0600, Rob Herring wrote:
> On Sun, Jan 20, 2019 at 11:26 AM Lubomir Rintel <lkundrak@...sk> wrote:
> > The Marvell Armada DRM master device is a virtual device needed to list all
> > nodes that comprise the graphics subsystem.
> > 
> > Signed-off-by: Lubomir Rintel <lkundrak@...sk>
> > ---
> >  .../display/armada/marvell-armada-drm.txt     | 24 +++++++++++++++++++
> >  1 file changed, 24 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/armada/marvell-armada-drm.txt b/Documentation/devicetree/bindings/display/armada/marvell-armada-drm.txt
> > index de4cca9432c8..3dbfa8047f0b 100644
> > --- a/Documentation/devicetree/bindings/display/armada/marvell-armada-drm.txt
> > +++ b/Documentation/devicetree/bindings/display/armada/marvell-armada-drm.txt
> > @@ -1,3 +1,27 @@
> > +Marvell Armada DRM master device
> > +================================
> > +
> > +The Marvell Armada DRM master device is a virtual device needed to list all
> > +nodes that comprise the graphics subsystem.
> > +
> > +Required properties:
> > +
> > + - compatible: value should be "marvell,dove-display-subsystem",
> > +   "marvell,armada-display-subsystem"
> > + - ports: a list of phandles pointing to display interface ports of CRTC
> > +   devices
> > + - memory-region: phandle to a node describing memory to be used for the
> > +   framebuffer
> > +
> > +Example:
> > +
> > +       display-subsystem {
> > +               compatible = "marvell,dove-display-subsystem",
> > +                            "marvell,armada-display-subsystem";
> > +               memory-region = <&display_reserved>;
> > +               ports = <&lcd0_port>;
> 
> If there is only one device, you don't need this virtual node.

Before I follow up on this and submit a version without the virtual
node, I'm wondering: is it okay that the bindings for the LCDC and the
framebuffer are in the same file, or would it be preferrable if they
were separate? Both styles seem to be used for the display bindings.

> 
> 
> > +       };
> > +
> >  Marvell Armada LCD controller
> >  =============================
> > 
> > --
> > 2.20.1

Lubo