[RFCv1 11/42] ARM: dts: omap: add channel to DSI panels

[Sebastian Reichel]

Hi,

On Mon, Nov 18, 2019 at 03:05:07PM +0200, Tomi Valkeinen wrote:
> On 17/11/2019 04:39, Sebastian Reichel wrote:
> > The standard binding for DSI requires, that the channel number
> > of the panel is encoded in DT. This adds the channel number in
> > all OMAP3-5 boards, in preparation for using common infrastructure.
> > 
> > Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
> > ---
> >   .../devicetree/bindings/display/panel/panel-dsi-cm.txt      | 4 +++-
> >   arch/arm/boot/dts/omap3-n950.dts                            | 3 ++-
> >   arch/arm/boot/dts/omap3.dtsi                                | 3 +++
> >   arch/arm/boot/dts/omap4-droid4-xt894.dts                    | 3 ++-
> >   arch/arm/boot/dts/omap4-sdp.dts                             | 6 ++++--
> >   arch/arm/boot/dts/omap4.dtsi                                | 6 ++++++
> >   arch/arm/boot/dts/omap5.dtsi                                | 6 ++++++
> >   7 files changed, 26 insertions(+), 5 deletions(-)
> 
> Is this required only in the .txt, or also by the driver? This does break
> backward compatibility with the dtbs, and there's always someone who won't
> like it.

I add a compatible string for the Droid 4 panel in addition to the
generic one, which is not really required and just a precaution in
case we need some quirks in the future.

But I had to add the DSI channel to DT, which is required to follow
the standard DSI bindings. We cannot use the generic infrastructure
without this change. Technically it should have been there all the
time, it is only working because it is currently hardcoded to 0 in
the panel driver.

TLDR: Yes, it is required by the driver and it does break backward
compatibility for N950 (panel does not yet work on mainline, since
the OMAP3 quirks are missing in the omapdrm DSI code), omap4-sdp (
untested, I do not know if its working) and Droid 4 (known to be
working with current mainline code, most likely people update their
DT anyways).

-- Sebastian
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