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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: e4f3fb4909 ("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>
This commit is contained in:
Soeren Moch 2019-10-03 23:50:34 +02:00 committed by Heiko Stuebner
parent cb11a90e33
commit 0990c5e757
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts
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@ -173,7 +173,7 @@
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1400000>;
regulator-max-microvolt = <1700000>;
vin-supply = <&vcc5v0_sys>;
};
};