On 24/11/16 08:38, Laxman Dewangan 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. Can you fix the above sentence? > 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. > > 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> > > --- > Changes from V1: > New in series based on pinctrl driver requirement. > > Changes from V2: > Updated the statement to say 1.8V and 3.3V as nominal voltage. > Corrected DT example by adding -supply and taken care of V1 review > from Rob. > > .../bindings/pinctrl/nvidia,tegra-io-pad.txt | 126 +++++++++++++++++++++ > 1 file changed, 126 insertions(+) > create mode 100644 Documentation/devicetree/bindings/pinctrl/nvidia,tegra-io-pad.txt > > diff --git a/Documentation/devicetree/bindings/pinctrl/nvidia,tegra-io-pad.txt b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra-io-pad.txt > new file mode 100644 > index 0000000..a88c484 > --- /dev/null > +++ b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra-io-pad.txt > @@ -0,0 +1,126 @@ > +NVIDIA Tegra PMC IO pad controller > + > +NVIDIA Tegra124 and later SoCs support the multi-voltage level and low power > +state of some of its IO pads. When IO interface are not used then IO pads can > +be configure in low power state to reduce the power from that IO pads. The IO > +pads can work in the nominal IO voltage of 1.8V and 3.3V from power rail > +sources. I would replace the above sentence with ... "The IO pads can operate at the nominal IO voltage of either 1.8V or 3.3V". Cheers Jon -- nvpublic -- 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
