Greetings All,
I have a custom board based on i.MX6Q and I am running Freescale Linux 3.10.53. I have two user LEDs on GPIO with given configuration. I can start using these LEDs with gpio_led driver by providing following configuration in the machine file (/arch/arm/mach-imx/mach-imx6q.c)
#define GREEN_LED_CLOUD IMX_GPIO_NR(4, 26)
#define GREEN_LED_POWER IMX_GPIO_NR(4, 28)
#define RED_LED_CLOUD IMX_GPIO_NR(4, 27)
#define RED_LED_POWER IMX_GPIO_NR(4, 29)
static const struct gpio_led my_leds[] __initconst = {
{
.name = "led-cloud:green",
.active_low = 1,
.gpio = GREEN_LED_CLOUD,
}, {
.name = "led-cloud:red",
.active_low = 1,
.gpio = RED_LED_CLOUD,
}, {
.name = "led-power:green",
.default_trigger = "heartbeat",
.active_low = 1,
.gpio = GREEN_LED_POWER,
}, {
.name = "led-power:red",
.active_low = 1,
.gpio = RED_LED_POWER,
},
};
static const struct gpio_led_platform_data my_led_pdata __initconst = {
.num_leds = ARRAY_SIZE(my_leds),
.leds = my_leds,
};
..
gpio_led_register_device(-1, &my_led_pdata);
But I want to configure these LEDs via Device Tree file. I am not sure exactly how I will add these entries in the Device Tree file. As per my current understanding I have created following node in the Device Tree file.
leds {
compatible = "gpio-leds";
led-green-1 {
label = "Green1";
gpios = <0x15 26 0>; /* 0x15 is defined as GPIO4 */
linux,default-trigger = "heartbeat";
linux,default-state = "on";
};
led-green-2 {
label = "Green2";
gpios = <0x15 28 0>; /* 0x15 is defined as GPIO4 */
linux,default-trigger = "heartbeat";
linux,default-state = "on";
};
led-red-1 {
label = "Red1";
gpios = <0x15 27 0>; /* 0x15 is defined as GPIO4 */
linux,default-trigger = "heartbeat";
linux,default-state = "on";
};
};
When I start my system, I receive following message for 3 LEDS I have defined in DT file.
leds-gpio leds.26: pins are not configured from the driver
and I can not use LEDs via /sys/class/leds/Green1. If I do echo 1 > /sys/class/leds/Green1/birghtness nothing happens with the LEDs. I suppose I have to define the GPIO muxing somewhere but I can't get where ?
Any help is appreciated.
Regards,
Farrukh Arshad.
