From mboxrd@z Thu Jan 1 00:00:00 1970 From: dev@lynxeye.de (Lucas Stach) Date: Mon, 29 Feb 2016 22:01:18 +0100 Subject: [PATCH] ARM: tegra: beaver: allow SD card voltage to be changed Message-ID: <1456779678-20173-1-git-send-email-dev@lynxeye.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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"; - 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>; -- 2.5.0