[RFC][PATCH] regulator: rpi-panel: Add regulator/backlight driver for RPi panel

[Mark Brown]

On Thu, Jul 30, 2020 at 09:37:48PM +0200, Marek Vasut wrote:
> On 7/30/20 9:13 PM, Mark Brown wrote:
> > On Thu, Jul 30, 2020 at 06:28:07PM +0200, Marek Vasut wrote:

> >> about it ? I can over-complicate this and split it into multiple
> >> drivers, but I don't think it's worth the complexity, considering that
> >> this is likely a one-off device which will never be re-used elsewhere,
> >> except on this one particular display module for RPi.

> > Now you've written that you've pretty much guaranteed someone's going to
> > use the same component elsewhere :)

> How? The firmware is closed and not available, neither is documentation
> for it, sadly.

Companies often find other markets for their one off things, the
original RPi is a great example of this!

> > I don't 100% follow how this would actually get used in a
> > system (perhaps the binding would help) but for these things if there's
> > only one tightly coupled user that's possible it's sometimes simpler to
> > just skip APIs and do things directly.

> That's what I'm trying to replace by this patch and tc358762 bridge
> driver and panel driver, the combined version is already in tree:
> drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
> but the tc358762 is clearly a generic bridge and the panel is generic
> too, so combining it into one panel driver doesn't seem right.

I see, so this is the remaining bits.  Perhaps the binding might help me
see how things fit together - I don't know anything about the system
really.  It's not doing anything that looks like it should cause the
framework too many problems so I'm not overly worried from that point of
view but equally well it's obviously not ideal.
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