PWM output wasn't working because it wasn't hooked up to its pincontrol.
This patch:
- hooks up PWM to its pincontrol, and documents what
the outputs are on the XU3
- switches the LEDs that are on PWM outputs to use PWM
rather than GPIO.
The main effect is that the brightness of the LEDs can be controlled, and
user-mode fan control is enabled via /sys/class/pwm
Acked-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Signed-off-by: Peter Chubb <peter.chubb@xxxxxxxxxxxx>
---
arch/arm/boot/dts/exynos5422-odroidxu3.dts | 50 +++++++++++++++++++++---------
1 file changed, 36 insertions(+), 14 deletions(-)
diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3.dts b/arch/arm/boot/dts/exynos5422-odroidxu3.dts
index f0ce60b..0c62156 100644
--- a/arch/arm/boot/dts/exynos5422-odroidxu3.dts
+++ b/arch/arm/boot/dts/exynos5422-odroidxu3.dts
@@ -287,25 +287,35 @@
status = "okay";
};
- leds {
- compatible = "gpio-leds";
- heartbeat {
- label = "blue:heartbeart";
- gpios = <&gpb2 2 0>;
- default-state = "off";
- linux,default-trigger = "heartbeat";
+ pwmleds {
+ compatible = "pwm-leds";
+
+ greenled {
+ label = "green:mmc0";
+ pwms = <&pwm 1 2000000 0>;
+ pwm-names = "pwm1";
+ /*
+ * Green LED is much brighter than the others
+ * so limit its max brightness
+ */
+ max_brightness = <127>;
+ linux,default-trigger = "mmc0";
};
- eMMC {
- label = "green:eMMC";
- gpios = <&gpb2 1 0>;
- default-state = "off";
- linux,default-trigger = "mmc0";
+ blueled {
+ label = "blue:heartbeat";
+ pwms = <&pwm 2 2000000 0>;
+ pwm-names = "pwm2";
+ max_brightness = <255>;
+ linux,default-trigger = "heartbeat";
};
+ };
- microSD {
+ gpioleds {
+ compatible = "gpio-leds";
+ redled {
label = "red:microSD";
- gpios = <&gpx2 3 0>;
+ gpios = <&gpx2 3 GPIO_ACTIVE_HIGH>;
default-state = "off";
linux,default-trigger = "mmc1";
};
@@ -415,3 +425,15 @@
shunt-resistor = <10000>;
};
};
+
+&pwm {
+ /*
+ * PWM 0 -- fan
+ * PWM 1 -- Green LED
+ * PWM 2 -- Blue LED
+ * PWM 3 -- on MIPI connector for backlight
+ */
+ pinctrl-0 = <&pwm0_out &pwm1_out &pwm2_out &pwm3_out>;
+ pinctrl-names = "default";
+ status = "okay";
+};
--
2.1.4
--
Dr Peter Chubb peter.chubb AT nicta.com.au
http://www.ssrg.nicta.com.au Software Systems Research Group/NICTA
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