alistair23-linux/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt

* NVIDIA Tegra Secure Digital Host Controller

This controller on Tegra family SoCs provides an interface for MMC, SD,
and SDIO types of memory cards.

This file documents differences between the core properties described
by mmc.txt and the properties used by the sdhci-tegra driver.

Required properties:
- compatible : should be one of:
  - "nvidia,tegra20-sdhci": for Tegra20
  - "nvidia,tegra30-sdhci": for Tegra30
  - "nvidia,tegra114-sdhci": for Tegra114
  - "nvidia,tegra124-sdhci": for Tegra124 and Tegra132
  - "nvidia,tegra210-sdhci": for Tegra210
  - "nvidia,tegra186-sdhci": for Tegra186
- clocks : Must contain one entry, for the module clock.
  See ../clocks/clock-bindings.txt for details.
- resets : Must contain an entry for each entry in reset-names.
  See ../reset/reset.txt for details.
- reset-names : Must include the following entries:
  - sdhci

Optional properties:
- power-gpios : Specify GPIOs for power control

Example:

sdhci@c8000200 {
	compatible = "nvidia,tegra20-sdhci";
	reg = <0xc8000200 0x200>;
	interrupts = <47>;
	clocks = <&tegra_car 14>;
	resets = <&tegra_car 14>;
	reset-names = "sdhci";
	cd-gpios = <&gpio 69 0>; /* gpio PI5 */
	wp-gpios = <&gpio 57 0>; /* gpio PH1 */
	power-gpios = <&gpio 155 0>; /* gpio PT3 */
	bus-width = <8>;
};

Optional properties for Tegra210 and Tegra186:
- pinctrl-names, pinctrl-0, pinctrl-1 : Specify pad voltage
  configurations. Valid pinctrl-names are "sdmmc-3v3" and "sdmmc-1v8"
  for controllers supporting multiple voltage levels. The order of names
  should correspond to the pin configuration states in pinctrl-0 and
  pinctrl-1.

Example:
sdhci@700b0000 {
	compatible = "nvidia,tegra210-sdhci", "nvidia,tegra124-sdhci";
	reg = <0x0 0x700b0000 0x0 0x200>;
	interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;
	clocks = <&tegra_car TEGRA210_CLK_SDMMC1>;
	clock-names = "sdhci";
	resets = <&tegra_car 14>;
	reset-names = "sdhci";
	pinctrl-names = "sdmmc-3v3", "sdmmc-1v8";
	pinctrl-0 = <&sdmmc1_3v3>;
	pinctrl-1 = <&sdmmc1_1v8>;
	status = "disabled";
};