Re: [PATCH 3/7] arm64: dts: qcom: sc7280: Hook up the touchscreen IO rail on villager

[Matthias Kaehlcke]

On Mon, Feb 06, 2023 at 06:48:12PM -0800, Douglas Anderson wrote:
> On never revs of sc7280-herobrine-villager (rev2+) the L3C rail is

nit: s/never/newer/

no need to re-spin just for this.

> provided to the touchscreen as the IO voltage rail. Let's add it in
> the device tree.
> 
> NOTE: Even though this is only really needed on rev2+ villagers (-rev0
> had non-functioning touchscreen and -rev1 had some hacky hardware
> magic), it doesn't actually hurt to do this for old villager revs. As
> talked about in the patch ("arm64: dts: qcom: sc7280: On QCard,
> regulator L3C should be 1.8V") the L3C regulator didn't go anywhere at
> all on older revs. That means that turning it on for older revs
> doesn't hurt other than drawing a tiny bit of extra power. Since -rev0
> and -rev1 villagers will never make it to real customers and it's nice
> not to have too many old device trees, the better tradeoff seems to be
> to enable it everywhere.
> 
> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>

Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>