From: Aapo Vienamo <avienamo@nvidia.com>
To: Ulf Hansson <ulf.hansson@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Mikko Perttunen <mperttunen@nvidia.com>
Cc: linux-mmc@vger.kernel.org, devicetree@vger.kernel.org,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
Aapo Vienamo <avienamo@nvidia.com>
Subject: [PATCH 5/7] arm64: dts: tegra210-p2180: Allow ldo2 to go down to 1.8 V
Date: Fri, 20 Jul 2018 15:45:44 +0300 [thread overview]
Message-ID: <1532090746-15863-6-git-send-email-avienamo@nvidia.com> (raw)
In-Reply-To: <1532090746-15863-1-git-send-email-avienamo@nvidia.com>
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;
--
2.7.4
next prev parent reply other threads:[~2018-07-20 12:45 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-20 12:45 [PATCH 0/7] Tegra SDHCI enable 1.8 V signaling on Tegar210 and Tegra186 Aapo Vienamo
2018-07-20 12:45 ` [PATCH 1/7] dt-bindings: Document Tegra SDHCI pinctrl bindings Aapo Vienamo
2018-07-25 6:47 ` Mikko Perttunen
2018-07-20 12:45 ` [PATCH 2/7] mmc: tegra: Reconfigure pad voltages during voltage switching Aapo Vienamo
2018-07-25 6:41 ` Mikko Perttunen
2018-07-25 8:35 ` Aapo Vienamo
2018-07-20 12:45 ` [PATCH 3/7] arm64: dts: Add Tegra210 sdmmc pinctrl voltage states Aapo Vienamo
2018-07-21 0:14 ` kbuild test robot
2018-07-25 6:49 ` Mikko Perttunen
2018-07-20 12:45 ` [PATCH 4/7] arm64: dts: Add Tegra186 " Aapo Vienamo
2018-07-21 1:29 ` kbuild test robot
2018-07-25 6:50 ` Mikko Perttunen
2018-07-20 12:45 ` Aapo Vienamo [this message]
2018-07-25 6:50 ` [PATCH 5/7] arm64: dts: tegra210-p2180: Allow ldo2 to go down to 1.8 V Mikko Perttunen
2018-07-20 12:45 ` [PATCH 6/7] arm64: dts: tegra210-p2180: Correct sdmmc4 vqmmc-supply Aapo Vienamo
2018-07-25 6:53 ` Mikko Perttunen
2018-07-20 12:45 ` [PATCH 7/7] arm64: dts: tegra210-p2597: Remove no-1-8-v from sdmmc1 Aapo Vienamo
2018-07-25 6:58 ` Mikko Perttunen
2018-07-25 8:12 ` Aapo Vienamo
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