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@xxxxxxxxxx>
Reviewed-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
.../bindings/mmc/nvidia,tegra20-sdhci.txt | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
index 9bce578..90c214d 100644
--- 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";
+};
--
2.7.4
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