[RFC v2 1/4] dt-bindings: drm/mediatek: Add Mediatek display subsystem dts binding

[Philipp Zabel]

Am Mittwoch, den 30.09.2015, 12:13 -0500 schrieb Rob Herring:
> On Mon, Sep 21, 2015 at 3:11 AM, Philipp Zabel <p.zabel at pengutronix.de> wrote:
> > Note how the display-subsystem node overlaps the larb node. Is that
> > acceptable?
> 
> Given what the graph looks like, perhaps. However, do you really need
> a container node? It only serves to provide a list of nodes (e.g. all
> the children) to include as components. There are other ways to
> determine this list. You could find all nodes just searching
> compatible strings for each component. You just need to bind the drm
> driver to some other DT node. Is there no node you can pick as the
> master component?

There is the mmsys clock-controller node at the top of the MMSYS address
space (0x14000000-0x14ffffff):

	mmsys: clock-controller at 14000000 {
		compatible = "mediatek,mt8173-mmsys", "syscon";
		reg = <0 0x14000000 0 0x1000>;
		#clock-cells = <1>;
	};

Its register space also contains the MMSYS_CONFIG region that controls
the multiplexers between the display function blocks, so that would be a
good candidate.
No driver binds to this node yet, the clocks are registered with
CLK_OF_DECLARE.

I'll try to bind to this node and have the driver find sibling nodes
using their compatible strings.

thanks
Philipp