On Wed, Nov 2, 2016 at 10:09 AM, Laxman Dewangan <ldewangan@xxxxxxxxxx> 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 power rail sources. When IO > interface are not used then IO pads can be configure in low power > state to reduce the power from that IO pads. > > On Tegra124, the IO power rail source is auto detected by 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 is removed from SoC and hence SW > must configure the PMC register explicitly to set proper voltage in > IO pads based on IO rail power source voltage. > > Add DT binding document for detailing the DT properties for > configuring IO pads voltage levels and its power state. > > Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx> (...) > +-nvidia,power-source-voltage: Integer. The voltage level of IO pads. The > + valid values are 1.8V and 3.3V. Macros are > + defined for these voltage levels in > + <dt-bindings/pinctrl/pinctrl-tegra-io-pad.h> > + Use TEGRA_IO_PAD_POWER_SOURCE_1800000UV for 1.8V > + Use TEGRA_IO_PAD_POWER_SOURCE_3300000UV for 3.3V > + > + All IO pads do not support the 1.8V/3.3V > + configurations. Valid values for "pins" are > + audio-hv, dmic, gpio, sdmmc1, sdmmc3, spi-hv. As mentioned in another patch, what is wrong with the standard power-source binding? Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
