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arm64: dts: tegra210-p2180: Allow ldo2 to go down to 1.8 V 

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>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Aapo Vienamo 2018-08-10 21:08:34 +03:00 committed by Thierry Reding
parent 24005fd1b3
commit 41cc3771c9
1 changed files with 1 additions and 10 deletions
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11
arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
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@ -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;