[PATCH 2/2 v4] drm/panel: ws2401: Add driver for WideChips WS2401

[Linus Walleij]

On Thu, Jul 15, 2021 at 4:25 AM Doug Anderson <dianders at chromium.org> wrote:

> > - Alter the logic so that we assign the backlight handle to
> >   panel->backlight directly and save some code.
>
> Officially this is disallowed according to comments. ...and I quote:
>
> /**
>  * @backlight:
>  *
>  * Backlight device, used to turn on backlight after the call
>  * to enable(), and to turn off backlight before the call to
>  * disable().
>  * backlight is set by drm_panel_of_backlight() or
>  * drm_panel_dp_aux_backlight() and drivers shall not assign it.
>  */
>
> I do not personally know the motivation of not letting drivers assign
> it, but with the words "shall not". Yikes!

I think it's a documentation bug. I trust Sam more than the docs.
I'll send a patch.

Yours,
Linus Walleij