Re: [PATCH v3 1/2] dt-bindings: leds: add cznic,turris-omnia-leds binding

[Rob Herring <robh@kernel.org>]

On Mon, Jul 13, 2020 at 12:11:51AM +0200, Jacek Anaszewski wrote:
> On 7/12/20 11:40 PM, Marek Behun wrote:
> > On Sun, 12 Jul 2020 23:27:07 +0200
> > Jacek Anaszewski <jacek.anaszewski@gmail.com> wrote:
> > 
> > > > +            multi-led@0 {
> > > > +                reg = <0>;
> > > > +                color = <LED_COLOR_ID_MULTI>;
> > > > +                function = LED_FUNCTION_POWER;
> > > 
> > > Please provide child nodes for each color LED. Let's stick
> > > to the bindings closely and not make any deviations from
> > > the beginning.
> > 
> > Why? It would make sense if there were devices using this controller
> > having other configuration, but on Omnia, all LEDs are RGB.
> > 
> > Also, if I do this, should I also make the driver check in the probe
> > function whether the per-channel child nodes are correct? Eg. if they
> > are always three: one for red, one for green and one for blue? Or
> > should the driver ignore this and only the device tree binding specify
> > it?
> > 
> > Because the way the driver is written now, it only registers
> > multi-color RGB LEDs.
> 
> This is not RGB framework, but multicolor framework. It is not justified
> to pretend that RGB is default. Unless you would state that clearly in
> the comment in DT, but that should be agreed upon with Rob.

If the LEDs are fixed in h/w and never vary for this controller, then 
they don't need to be in DT. However, is it really possible that a 
channel only supports 1 color of LED? I don't think so.

Rob