On Mon, Feb 06, 2023 at 06:48:10PM -0800, Douglas Anderson wrote: > On the first sc7280 QCards the L3C rail was never really used for > anything. Stuffing options on the QCard meant that the QCard itself > didn't use this rail for anything. This rail did get sent to the > mainboard, but no existing mainboards ever did anything with it other > that route it to a testpoint. nit: s/that/than/ no need to re-spin just for that > On later sc7280 QCards, the L3C rail was repurposed. Instead of being > a (nominally) 3.3V rail, it was decided to make it a 1.8V rail. It is > now provided to the display connector (which might route it to the > touchscreen) and also used to power some buffers relating to > touchscreen IO. This rail is getting the additional tag "ts_avccio", > though some places still refer to it as "vreg_l3c_3p0" despite the > fact that the name now specifies the wrong voltage. > > Since it never hurts for this rail to be 1.8V (even on old QCards / > old boards), let's just change it to 1.8V across the board and add the > extra "ts_avccio" moniker as a label in the device tree. > > Future patches will start using this rail in their touchscreens. > > Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
