4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Klaus Goger klaus.goger@theobroma-systems.com
commit 87eba0716011e528f7841026f2cc65683219d0ad upstream.
vdd_log has no consumer and therefore will not be set to a specific voltage. Still the PWM output pin gets configured and thence the vdd_log output voltage will changed from it's default. Depending on the idle state of the PWM this will slightly over or undervoltage the logic supply of the RK3399 and cause instability with GbE (undervoltage) and PCIe (overvoltage). Since the default value set by a voltage divider is the correct supply voltage and we don't need to change it during runtime we remove the rail from the devicetree completely so the PWM pin will not be configured.
Signed-off-by: Klaus Goger klaus.goger@theobroma-systems.com Signed-off-by: Heiko Stuebner heiko@sntech.de Cc: Jakob Unterwurzacher jakob.unterwurzacher@theobroma-systems.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 11 ----------- 1 file changed, 11 deletions(-)
--- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi @@ -155,17 +155,6 @@ regulator-min-microvolt = <5000000>; regulator-max-microvolt = <5000000>; }; - - vdd_log: vdd-log { - compatible = "pwm-regulator"; - pwms = <&pwm2 0 25000 0>; - regulator-name = "vdd_log"; - regulator-min-microvolt = <800000>; - regulator-max-microvolt = <1400000>; - regulator-always-on; - regulator-boot-on; - status = "okay"; - }; };
&cpu_b0 {