Re: [PATCH v5 09/20] drm/bridge: ti-sn65dsi86: Break GPIO and MIPI-to-eDP bridge into sub-drivers

[Linus Walleij]

On Fri, Apr 23, 2021 at 6:59 PM Douglas Anderson <dianders@xxxxxxxxxxxx> wrote:

> Let's use the newly minted aux bus to break up the driver into sub
> drivers. We're not doing a full breakup here: all the code is still in
> the same file and remains largely untouched. The big goal here of
> using sub-drivers is to allow part of our code to finish probing even
> if some other code needs to defer. This can solve some chicken-and-egg
> problems. Specifically:
> - In commit 48834e6084f1 ("drm/panel-simple: Support hpd-gpios for
>   delaying prepare()") we had to add a bit of a hack to simpel-panel
>   to support HPD showing up late. We can get rid of that hack now
>   since the GPIO part of our driver can finish probing early.
> - We have a desire to expose our DDC bus to simple-panel (and perhaps
>   to a backlight driver?). That will end up with the same
>   chicken-and-egg problem. A future patch to move this to a sub-driver
>   will fix it.
> - If/when we support the PWM functionality present in the bridge chip
>   for a backlight we'll end up with another chicken-and-egg
>   problem. If we allow the PWM to be a sub-driver too then it solves
>   this problem.
>
> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
> ---
>
> Changes in v5:
> - Fix module compile problems (Bjorn + kbuild bot)
> - Remove useless MODULE_DEVICE_TABLE (Bjorn).

This is generally a good idea. I have no idea when to use
auxbus or MFD but I trust that you researched that so:
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Yours,
Linus Walleij