| From fe9ee4d99e9e7145c57d5b997afb0450054a1673 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Mon, 30 Jul 2018 13:31:31 +0100 |
| Subject: arm64: dts: allwinner: a64: Olinuxino: fix DRAM voltage |
| |
| From: Andre Przywara <andre.przywara@arm.com> |
| |
| [ Upstream commit 93366b49a35f3a190052734b3f32c8fe2535b53f ] |
| |
| 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> |
| Signed-off-by: Sasha Levin <sashal@kernel.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"; |
| }; |
| |
| -- |
| 2.20.1 |
| |
