On Mon, Feb 06, 2023 at 06:48:11PM -0800, Douglas Anderson wrote: > The "pp3300_left_in_mlb" rail on herobrine eventually connects up to > "vreg_edp_3p3" on the qcard. On several herobrine designs this rail > has been measured to need more than 1ms to turn on. > > While technically a herobrine derivative (defined as anyone including > the "herobrine.dtsi") could change the board to make the rail rise > faster or slower, the fact that two boards (evoker and villager) both > measured it as taking more than 1ms implies that it's probably going > to be the norm. Thus, let's add a "regulator-enable-ramp-delay" > straight into the herobrine.dtsi to handle this. If a particular > derivative board needs a faster or slower one then they can override > it, though that feels unlikely. > > While we measured something a bit over 1ms, we'll choose 3ms to give > us a tiny bit of margin. This isn't a rail that turns off and on all > the time anyway and 3ms is nothing compared to the total amount of > time to power on a panel. > > Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
