[PATCH] ARM: tegra: beaver: allow SD card voltage to be changed
From: jonathanh@nvidia.com (Jon Hunter)
Date: 2016-05-19 14:31:31
Also in:
linux-tegra
On 29/02/16 21:01, Lucas Stach wrote:
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This allows to switch the card signal voltage level to 1.8V, which is needed for any ultra high speed modes to work. Signed-off-by: Lucas Stach <dev@lynxeye.de> --- This needs the SDMMC memcomp pad calibration patches I just sent out to be applied, otherwise the card voltage change will fail with a message in the kernel log and a fall back to high speed operation. --- arch/arm/boot/dts/tegra30-beaver.dts | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)diff --git a/arch/arm/boot/dts/tegra30-beaver.dts b/arch/arm/boot/dts/tegra30-beaver.dts index 1daed40..6b237f2 100644 --- a/arch/arm/boot/dts/tegra30-beaver.dts +++ b/arch/arm/boot/dts/tegra30-beaver.dts@@ -1848,7 +1848,7 @@ ldo5_reg: ldo5 { regulator-name = "vddio_sdmmc,avdd_vdac";
Stephen, looking at the schematics, I don't see that this is connected to the avdd_vdac (which appears to be unconnected) and so I am wondering if this name should be just "vddio_sdmmc"?
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- regulator-min-microvolt = <3300000>; + regulator-min-microvolt = <1800000>; regulator-max-microvolt = <3300000>; regulator-always-on; };@@ -1919,6 +1919,7 @@ sdhci at 78000000 { status = "okay"; + vqmmc-supply = <&ldo5_reg>; cd-gpios = <&gpio TEGRA_GPIO(I, 5) GPIO_ACTIVE_LOW>; wp-gpios = <&gpio TEGRA_GPIO(T, 3) GPIO_ACTIVE_HIGH>; power-gpios = <&gpio TEGRA_GPIO(D, 7) GPIO_ACTIVE_HIGH>;
Otherwise ... Acked-by: Jon Hunter <jonathanh@nvidia.com> Cheers Jon -- nvpublic