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

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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>
This commit is contained in:
Aapo Vienamo 2018-08-30 18:06:03 +03:00 committed by Ulf Hansson
parent 75586bb949
commit 3700cdf8e3
1 changed files with 22 additions and 0 deletions
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22
Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
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@ -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";
};