This describe DT binding of the pad controller driver for Tegra 186 pmc.

Required properties:
- Compatible: Must be nvidia,tegra186-pmc.
- #padcontroller-cells: Number of padctrl arguments. It must be 1.

Pad intitialisation through subnode:
==================================
Driver offers the pad initialisation through subnode. The subnode
under "pmc" node contains the subnode name "io-pad-defaults" which contains
child node of pads and their settings.
Following are child node name for the "io-pad-defaults" node.
	audio-hv, dmic-hv, ao-hv, sdmmc1-hv, sdmmc2-hv, sdmmc3-hv,
	spi, dbg, ufs.

Optional properties:
- nvidia,pad-name: Pad name if child node name is not used for pad name.
- nvidia,io-pad-init-voltage: Voltage value. Options are
		IO_RAIL_VOLTAGE_1_2V,
		IO_RAIL_VOLTAGE_1_8V,
		IO_RAIL_VOLTAGE_3_3V.
- nvidia,deep-power-down-enable: Boolean, Deep power down enable.
- nvidia,deep-power-down-disable: Boolean, deep power down disable.
- nvidia,io-pad-power-enable: boolean, enable io pad power i.e. deep power
		down disable.
- nvidia,io-pad-power-disable: boolean, disable io pad power i.e. deep
		power down enable.
- nvidia,enable-dynamic-pad-voltage: boolean, allow dynamic pad voltage
		configuration. If this property is mising then it only
		only allo the configuration during init and thereafter,
		no dynamic switching.

	Property should be used for better readbility and not conflict with
	other properties.

	pmc {
		::::
		io-pad-defaults {
			audio-hv {
				nvidia,deep-power-down-enable;
			};

			dmic-hv {
				nvidia,io-pad-init-voltage = <IO_RAIL_VOLTAGE_1_8V>;
			};
			:::
		};
	};


Example: SDMMC1 pad is 6 and SDMMC3 is 7.

	tegra_pmc: pmc@c360000 {
		compatible = "nvidia,tegra186-pmc";
		reg = <0x0 0xc360000 0x0 0x400>;
		#padcontroller-cells = <1>;
		status = "disabled";
		io-pad-defaults {
			gpio {
				nvidia,io-pad-init-voltage = <IO_RAIL_VOLTAGE_1_8V>;
			};
			audio-hv {
				nvidia,io-pad-init-voltage = <IO_RAIL_VOLTAGE_3_3V>;
			};
		};
	};


	sdhci@700b0400 {
		compatible = "nvidia,tegra186-sdhci";
		::::
		pad-controllers = <&tegra_pmc TEGRA186_PAD_SDMMC3>;
		pad-names = "sdmmc";
		::::
	};