dt-bindings: mmc: tegra: Add pad voltage control properties

Document the pinctrl bindings used by the SDHCI driver to reconfigure
pad voltages on controllers supporting multiple voltage levels.

Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
index 9bce578..90c214d 100644 (file)
--- a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
@@ -38,3 +38,25 @@ sdhci@c8000200 {
        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";
+};