Re: [PATCH v10 0/6] Raspberry Pi Sense HAT driver

[Maxime Ripard]

On Wed, Aug 24, 2022 at 08:06:59AM -0400, Charles Mirabile wrote:
> On Tue, Aug 23, 2022 at 5:30 PM Stefan Wahren <stefan.wahren@xxxxxxxx> wrote:
> > >    drivers/auxdisplay: sensehat: Raspberry Pi Sense HAT display driver
> > We don't have an Ack for this display driver. Maybe we should ask Maxime
> > Ripard and Noralf Trønnes especially Pavel Machek had concerns about the
> > right subsystem?
>
> I just looked back at the comments from Pavel on v9. I had meant to
> reply to him, and I actually drafted something but it got lost in the
> shuffle and I never sent it (also my bad).
>
> The driver is an fbdev in the raspberry pi tree, and that is where we
> started when upstreaming, but right from the outset we were told that
> it couldn't be an fbdev since that subsystem is being deprecated
> the replacement is the DRM subsystem

Indeed

> but (as Matthias Brugger suggests) that is probably overkill for an
> 8x8 display. Does that settle the subsystem question?

If you were aiming for an fbdev driver, a KMS driver these days would be
notably simpler.

We've added simpler and simpler devices, such as the SSD1306 recently,
so I can't see anything wrong with using KMS either.

Maxime

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