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SubjectRe: [PATCH 5/7] arm64: dts: tegra210-p2180: Allow ldo2 to go down to 1.8 V
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Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>

On 20.07.2018 15:45, Aapo Vienamo wrote:
> 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>
> ---
> 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;
>

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