On Wed, Nov 9, 2016 at 2:06 PM, Laxman Dewangan <[email protected]> wrote:
> NVIDIA Tegra124 and later SoCs support the multi-voltage level and > low power state of some of its IO pads. The IO pads can work in > the voltage of the 1.8V and 3.3V of IO voltage from IO power rail > sources. When IO interfaces are not used then IO pads can be > configure in low power state to reduce the power consumption from > that IO pads. > > On Tegra124, the voltage level of IO power rail source is auto > detected by hardware(SoC) and hence it is only require to configure > in low power mode if IO pads are not used. > > On T210 onwards, the auto-detection of voltage level from IO power > rail is removed from SoC and hence SW need to configure the PMC > register explicitly to set proper voltage in IO pads based on > IO rail power source voltage. > > This driver adds the IO pad driver to configure the power state and > IO pad voltage based on the usage and power tree via pincontrol > framework. The configuration can be static and dynamic. > > Signed-off-by: Laxman Dewangan <[email protected]> > > --- > Changes from V1: > - Dropped the custom properties to set pad voltage and use regulator. > - Added support for regulator to get vottage in boot and configure IO > pad voltage. > - Add support for callback to handle regulator notification and configure > IO pad voltage based on voltage change. I'm waiting for maintainer review on this. Stephen/Thierry? Yours, Linus Walleij
