[PATCH v2 06/10] arm64: dts: tegra210-p2180: Allow ldo2 to go down to 1.8 V

Aapo Vienamo
2018-07-26T12:19:16Z

Set regulator-min-microvolt property of ldo2 to 1.8 V in
tegra210-p2180.dtsi. ldo2 is used by the sdmmc1 SDHCI controller and its
voltage needs to be adjusted down to 1.8 V to support faster signaling
modes. It appears that the comment about the SDHCI driver requesting
invalid voltages no longer applies.

Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
---
arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi | 11 +----------
1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
index 212e663..8496101 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
@@ -178,16 +178,7 @@

vddio_sdmmc: ldo2 {
regulator-name = "VDDIO_SDMMC";
- /*
- * Technically this supply should have
- * a supported range from 1.8 - 3.3 V.
- * However, that would cause the SDHCI
- * driver to request 2.7 V upon access
- * and that in turn will cause traffic
- * to be broken. Leave it at 3.3 V for
- * now.
- */
- regulator-min-microvolt = <3300000>;
+ regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <3300000>;
regulator-always-on;
regulator-boot-on;
--
2.7.4