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Re: [PATCH 0/2] drm/panel: Add support for the Sitronix ST7789V

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Den 06.02.2017 11.39, skrev Maxime Ripard:
> Hi Noralf,
>
> On Fri, Feb 03, 2017 at 07:48:51PM +0100, Noralf Trønnes wrote:
>> Den 03.02.2017 10.59, skrev Maxime Ripard:
>>> Hi,
>>>
>>> Here is an attempt at supporting the ST7789V LCD controller from Sitronix.
>> What happens if there's another panel driven by ST7789V that needs
>> a different controller initialization?
> You know those panels / controllers much better than I do, but why
> would that be the case?
>
>> Maybe it's better to name it after the panel, not the controller.
> I guess you could also use that panel directly without the controller?

A controller can drive many different panels that can require different
initializations. I faced that with staging/fbtft, when I wrote
controller drivers having initialization code, and then came across
displays with the same controller but with a different initialization.

Trying to write controller drivers for these controllers is very
difficult with all the possible permutations. On top of that we have
those undocumented commands/registers.

Some panels come with embedded controllers, in which case it makes
sense to write a driver for the panel.

But if the panel and controller are separate, then I don't know. Maybe
the chance of coming across two uncompatible ST7789V and panel
combinations in drm/panel is extremly low.


Noralf.

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[PATCH 0/2] drm/panel: Add support for the Sitronix ST7789V Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-02-03 11:00 +0100
  [PATCH v3 2/2] ARM: sun8i: dt: Add mali node Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-02-03 11:00 +0100
  [PATCH v3 1/2] dt-bindings: gpu: Add Mali Utgard bindings Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-02-03 11:10 +0100
  [PATCH 1/2] dt-bindings: display: panel: Add bindings for the Sitronix ST7789V panel Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-02-03 11:10 +0100
    Re: [PATCH 1/2] dt-bindings: display: panel: Add bindings for the  Sitronix ST7789V panel Thierry Reding <thierry.reding@gmail.com> - 2017-02-06 14:10 +0100
      Re: [PATCH 1/2] dt-bindings: display: panel: Add bindings for the  Sitronix ST7789V panel Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-02-07 16:50 +0100
        Re: [PATCH 1/2] dt-bindings: display: panel: Add bindings for the  Sitronix ST7789V panel Thierry Reding <thierry.reding@gmail.com> - 2017-02-07 17:50 +0100
  [PATCH 2/2] drm/panel: Add driver for sitronix ST7789V panel Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-02-03 11:10 +0100
    Re: [PATCH 2/2] drm/panel: Add driver for sitronix ST7789V panel Noralf Trønnes <noralf@tronnes.org> - 2017-02-03 20:00 +0100
      Re: [PATCH 2/2] drm/panel: Add driver for sitronix ST7789V panel Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-02-06 12:00 +0100
        Re: [PATCH 2/2] drm/panel: Add driver for sitronix ST7789V panel Noralf Trønnes <noralf@tronnes.org> - 2017-02-06 13:20 +0100
          Re: [PATCH 2/2] drm/panel: Add driver for sitronix ST7789V panel Thierry Reding <thierry.reding@gmail.com> - 2017-02-06 13:30 +0100
    Re: [PATCH 2/2] drm/panel: Add driver for sitronix ST7789V panel Thierry Reding <thierry.reding@gmail.com> - 2017-02-06 14:30 +0100
      Re: [PATCH 2/2] drm/panel: Add driver for sitronix ST7789V panel Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-02-07 17:00 +0100
  Re: [PATCH 0/2] drm/panel: Add support for the Sitronix ST7789V Noralf Trønnes <noralf@tronnes.org> - 2017-02-03 19:50 +0100
    Re: [PATCH 0/2] drm/panel: Add support for the Sitronix ST7789V Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-02-06 11:40 +0100
      Re: [PATCH 0/2] drm/panel: Add support for the Sitronix ST7789V Noralf Trønnes <noralf@tronnes.org> - 2017-02-06 12:30 +0100
        Re: [PATCH 0/2] drm/panel: Add support for the Sitronix ST7789V Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-02-07 16:40 +0100
          Re: [PATCH 0/2] drm/panel: Add support for the Sitronix ST7789V Thierry Reding <thierry.reding@gmail.com> - 2017-02-07 17:50 +0100

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