There are a few issues with the GPU regulator defined for Jetson Nano
which are:
1. The GPU regulator is a PWM based regulator and not a fixed voltage
regulator.
2. The output voltages for the GPU regulator are not correct.
3. The regulator enable ramp delay is too short for the regulator and
needs to be increased. 2ms should be sufficient.
4. This is the same regulator used on Jetson TX1 and so make the ramp
delay and settling time the same as Jetson TX1.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
---
.../boot/dts/nvidia/tegra210-p3450-0000.dts | 21 +++++++++++--------
1 file changed, 12 insertions(+), 9 deletions(-)
diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts b/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts
index 63df72eecf21..9d17ec707bce 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts
@@ -88,6 +88,10 @@
status = "okay";
};
+ pwm@7000a000 {
+ status = "okay";
+ };
+
i2c@7000c500 {
status = "okay";
clock-frequency = <100000>;
@@ -664,17 +668,16 @@
};
vdd_gpu: regulator@6 {
- compatible = "regulator-fixed";
+ compatible = "pwm-regulator";
reg = <6>;
-
+ pwms = <&pwm 1 4880>;
regulator-name = "VDD_GPU";
- regulator-min-microvolt = <5000000>;
- regulator-max-microvolt = <5000000>;
- regulator-enable-ramp-delay = <250>;
-
- gpio = <&pmic 6 GPIO_ACTIVE_HIGH>;
- enable-active-high;
-
+ regulator-min-microvolt = <710000>;
+ regulator-max-microvolt = <1320000>;
+ regulator-ramp-delay = <80>;
+ regulator-enable-ramp-delay = <2000>;
+ regulator-settling-time-us = <160>;
+ enable-gpios = <&pmic 6 GPIO_ACTIVE_HIGH>;
vin-supply = <&vdd_5v0_sys>;
};
};
--
2.17.1
