arm64: dts: rockchip: fix RockPro64 vdd-log regulator settings

The RockPro64 schematic [1] page 18 states a min voltage of 0.8V and a
max voltage of 1.4V for the VDD_LOG pwm regulator. However, there is an
additional note that the pwm parameter needs to be modified.
From the schematics a voltage range of 0.8V to 1.7V can be calculated.
Additional voltage measurements on the board show that this fix indeed
leads to the correct voltage, while without this fix the voltage was set
too high.

[1] http://files.pine64.org/doc/rockpro64/rockpro64_v21-SCH.pdf

Fixes: e4f3fb490967 ("arm64: dts: rockchip: add initial dts support for Rockpro64")
Signed-off-by: Soeren Moch <smoch@web.de>
Link: https://lore.kernel.org/r/20191003215036.15023-1-smoch@web.de
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts b/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts
index c27d8a6ae1c594d87341a878e7d7faa088442560..98a5f323bc1d314fa82015f0de1ec9d86593765f 100644 (file)
--- a/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts
@@ -173,7 +173,7 @@ vdd_log: vdd-log {
                regulator-always-on;
                regulator-boot-on;
                regulator-min-microvolt = <800000>;
-               regulator-max-microvolt = <1400000>;
+               regulator-max-microvolt = <1700000>;
                vin-supply = <&vcc5v0_sys>;
        };
 };