Hi Peter,
On 14/05/2015, Peter Chubb <peter.chubb@xxxxxxxxxxxx> wrote:
>
> 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
I wonder how PWM can be enabled on the odroidxu3 board.
I could not find the node getting populated in the /sys/class/leds/
root@odroidxu3:l# la -la /sys/class/leds/
total 0
drwxr-xr-x 2 root root 0 Jul 31 04:56 .
drwxr-xr-x 47 root root 0 Jul 31 04:56 ..
lrwxrwxrwx 1 root root 0 Jul 31 04:56 red:microSD ->
../../devices/platform/gpioleds/leds/red:microSD
Well I have enable. following config options in .config.
CONFIG_LEDS_CLASS=y
CONFIG_LEDS_GPIO=y
CONFIG_LEDS_PWM=m
CONFIG_LEDS_SYSCON=y
# CONFIG_LEDS_PM8941_WLED is not set
CONFIG_LEDS_TRIGGERS=y
CONFIG_LEDS_TRIGGER_TIMER=y
CONFIG_LEDS_TRIGGER_ONESHOT=y
CONFIG_LEDS_TRIGGER_HEARTBEAT=y
CONFIG_LEDS_TRIGGER_BACKLIGHT=y
# CONFIG_LEDS_TRIGGER_CPU is not set
CONFIG_LEDS_TRIGGER_GPIO=y
CONFIG_LEDS_TRIGGER_DEFAULT_ON=y
CONFIG_LEDS_TRIGGER_TRANSIENT=y
# CONFIG_LEDS_TRIGGER_CAMERA is not set
Please let me know if I am missing some thing.
-Anand Moon
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