basic approach for LED interface with GPIO pins.

anamikalal — Thu, 13 Aug 2015 06:05:37 GMT

Hi all,

I am a newbie in device driver stuffs. I want to connect LEDs to the gpio pins of imx6qdl and use it for debugging purpose.

For that purpose I have modified the device tree as follows:

leds {

pinctrl-names ="default";

pinctrl-0 =<&pinctrl_leds>;

compatible = "gpio-leds";

debug-led-1 {

label ="Debug-led1";

gpios = <&gpio1 1>;

linux,default-trigger ="heartbeat";

linux,default-state ="on";

};

debug-led-2 {

label ="Debug-led2";

gpios= <&gpio1 2>;

linux,default-trigger ="heartbeat";

linux,default-state ="on";

};

the pinctrl settings are:-

pinctrl_leds: ledsgrp {

fsl,pins = <

MX6QDL_PAD_GPIO_1__GPIO1_IO01 0x0b0b0 /*Debug-led-1*/

MX6QDL_PAD_GPIO_2__GPIO1_IO02 0x0b0b0 /*Debug-led-2 */

}

Now I want to know what else I need to do for configuring the gpio pins?

Do I need to modify the board setup code?

Do I need to add/modify something in device driver (leds-gpio.c)code? (eg: platform_device or platform_data structure or the device tree will take care of it?)

Please help !!!

Thanks,

Anamika

Re: basic approach for LED interface with GPIO pins.

CarlosCasillas — Fri, 14 Aug 2015 23:57:34 GMT

Hi Anamika,

The following threads may be useful for you:

imx6sl evk debug led

Re: Re: GPIO interrupt on i.MX6

Re: Proper GPIO interrupt handling in iMX6

Hope this will be useful for you.

Best regards!

/Carlos

topic Re: basic approach for LED interface with GPIO pins. in i.MX Processors

basic approach for LED interface with GPIO pins.

Re: basic approach for LED interface with GPIO pins.