On Wed, Aug 28, 2019 at 9:43 PM Maxime Ripard <mripard@xxxxxxxxxx> wrote: > > On Wed, Aug 28, 2019 at 09:29:32PM +0800, Chen-Yu Tsai wrote: > > On Wed, Aug 28, 2019 at 8:52 PM Linus Walleij <linus.walleij@xxxxxxxxxx> wrote: > > > > > > On Sun, Aug 25, 2019 at 5:06 PM Alejandro González > > > <alejandro.gonzalez.correo@xxxxxxxxx> wrote: > > > > > > > Jernej Skrabec compared the BSP driver with this > > > > driver, and found that the BSP driver configures pinctrl to operate at > > > > 1.8 V when entering DDR mode (although 3.3 V operation is supported), while > > > > the mainline kernel lacks any mechanism to switch voltages dynamically. > > > > AFAIK The Pine H64 does not have the ability to switch I/O voltages. It is > > fixed to either 1.8V (the default based on the schematics) or 3.3V. > > Should that be handled at the board level then maybe? Yeah. You'd specify which one using vqmmc-supply in the mmc node and vcc-pc-supply in the pinctrl node. ChenYu
