Re: [PATCH v1 35/36] dt-bindings: display: convert lgphilips,lb035q02 to DT Schema

[Sam Ravnborg <sam@xxxxxxxxxxxx>]

Hi Tomi.

On Mon, Mar 16, 2020 at 10:42:45AM +0200, Tomi Valkeinen wrote:
> On 16/03/2020 10:26, Sam Ravnborg wrote:
> 
> > > Isn't this also compatible with panel-simple bindings? 'label' is the only
> > > one not in panel-simple, but that's optional and has never been used by the
> > > panel driver.
> > The panel is a SPI slave - which is not too obvious from the old
> > binding.
> > 
> > The new DT Schema includes spi/spi-slave.yaml to give the binding
> > proper access to the spi slave properties.
> > 
> > That would not be possible with panel-simple binding as no further
> > properties are allowed with the panel-simple binding.
> > 
> > I hope this explains why there is a dedicated binding for this panel.
> 
> Hmm, but how is this different than, say, DSI panels? There are DSI panels
> in panel-simple bindings, and those might require DSI bus parameters ('reg'
> in the minimum).


We have panel-simple-dsi for DSI simple based panels.
This binding includes the reg property.

If we have included DSI panels in panel-simple.yaml, and we likely have
by accident, then they should be moved to panel-simple-dsi.yaml.

If they requires anything else then they shall have their
own binding.

panel-simple.yaml and panel-simple.dsi.yaml are on purpose
only for the simple panels and they have:
"additionalProperties: false" to avoid that a lot
of extra sneaks in.

I actually considered shortly a panel-simple-spi.yaml,
but the few panels I looked at had different names
for the power-supply so that did not fly.
I did not check them all - we have today (with this patch-set)
9 bindings that references spi-slave.yaml.

	Sam