From 9c7d1485b632b23847caf76dc24e3a8e674c2fe7 Mon Sep 17 00:00:00 2001
From: Andre Przywara <andre.przywara@arm.com>
Date: Mon, 30 Jul 2018 13:31:31 +0100
Subject: [PATCH] arm64: dts: allwinner: a64: Olinuxino: fix DRAM voltage
The Olinuxino board uses DDR3L chips which are supposed to be driven
with 1.35V. The reset default of the AXP is properly set to 1.36V.
While technically the chips can also run at 1.5 volts, changing the
voltage on the fly while booting Linux is asking for trouble. Also
running at a lower voltage saves power.
So fix the DCDC5 value to match the actual board design.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Tested-by: Martin Lucina <martin@lucina.net>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---
arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts b/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts
index 3f531393eaee9..b3f186434f363 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts
@@ -142,10 +142,14 @@
/* DCDC3 is polyphased with DCDC2 */
+/*
+ * The board uses DDR3L DRAM chips. 1.36V is the closest to the nominal
+ * 1.35V that the PMIC can drive.
+ */
®_dcdc5 {
regulator-always-on;
- regulator-min-microvolt = <1500000>;
- regulator-max-microvolt = <1500000>;
+ regulator-min-microvolt = <1360000>;
+ regulator-max-microvolt = <1360000>;
regulator-name = "vcc-ddr3";
};
--
2.39.5