[PATCH] drm: rcar-du: Document the vsps property in the DT bindings

[Geert Uytterhoeven]

Hi Laurent,

On Fri, Mar 31, 2017 at 11:19 AM, Laurent Pinchart
<laurent.pinchart at ideasonboard.com> wrote:
> On Monday 27 Mar 2017 13:05:48 Geert Uytterhoeven wrote:
>> On Mon, Mar 27, 2017 at 11:56 AM, Laurent Pinchart wrote:
>> > The property is used by the driver but is missing from the DT bindings.
>> > Document it.
>> >
>> > Reported-by: Geert Uytterhoeven <geert at linux-m68k.org>
>> > Signed-off-by: Laurent Pinchart
>> > <laurent.pinchart+renesas at ideasonboard.com>
>> > ---
>> >  Documentation/devicetree/bindings/display/renesas,du.txt | 5 +++++
>> >  1 file changed, 5 insertions(+)
>> >
>> > diff --git a/Documentation/devicetree/bindings/display/renesas,du.txt
>> > b/Documentation/devicetree/bindings/display/renesas,du.txt index
>> > 1a02f099a0ff..cf34893a1b53 100644
>> > --- a/Documentation/devicetree/bindings/display/renesas,du.txt
>> > +++ b/Documentation/devicetree/bindings/display/renesas,du.txt
>> >
>> > @@ -36,6 +36,11 @@ Required Properties:
>> >        When supplied they must be named "dclkin.x" with "x" being the
>> >        input
>> >        clock numerical index.
>> >
>> > +Optional Properties:
>> > +
>> > +  - vsps: A list of phandles to the VSP nodes that handle the memory
>> > +    interfaces for the DU channels (Gen3 only).
>>
>> ", one per channel"?
>>
>> Required for Gen3, optional for Gen2? (cfr. Sergei's patches).
>
> How about making it mandatory on Gen2 as well ? The VSPs are there, even if
> the driver doesn't use them, it makes sense to describe the connection. Of

Fine for me, as this is hardware description.

> course the driver will treat the property as optional for backward
> compatibility.

OK.

Disclaimer: I didn't follow the discussion about using or not using the vsps
on Gen2 that closely, and don't remember the outcome.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds