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 338e786155b1f..2ef779b027572 100644 --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts @@ -120,10 +120,14 @@
/* 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"; };