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GPIOLED(4)             FreeBSD Kernel Interfaces Manual             GPIOLED(4)

     gpioled - GPIO LED generic device driver

     To compile this driver into the kernel, place the following lines in your
     kernel configuration file:

           device gpio
           device gpioled

     The gpioled driver provides glue to attach a led(4) compatible device to
     a GPIO pin.  Each LED in the system has a name which is used to export a
     device as /dev/led/<name>.  The GPIO pin can then be controlled by
     writing to this device as described in led(4).

     On a device.hints(5) based system, like MIPS, these values are
     configurable for gpioled:         The gpiobus you are attaching to.  Normally
                                assigned to gpiobus0.       Arbitrary name of device in /dev/led/ to
                                create for led(4).

     hint.gpioled.%d.pins       Which pin on the GPIO interface to map to this
                                instance.  Please note that this mask should
                                only ever have one bit set (any other bits -
                                i.e., pins - will be ignored).

     On a FDT(4) based system, like ARM, the DTS part for a gpioled device
     usually looks like:

     gpio: gpio {


             led0 {
                     compatible = "gpioled";
                     gpios = <&gpio 16 2 0>;         /* GPIO pin 16. */
                     name = "ok";

             led1 {
                     compatible = "gpioled";
                     gpios = <&gpio 17 2 0>;         /* GPIO pin 17. */
                     name = "user-led1";

     Optionally, you can choose to combine all the LEDs under a single
     ``gpio-leds'' compatible node:

     simplebus0 {


             leds {
                     compatible = "gpio-leds";

                     led0 {
                             gpios = <&gpio 16 2 0>;
                             name = "ok"

                     led1 {
                             gpios = <&gpio 17 2 0>;
                             name = "user-led1"

     Both methods are equally supported and it is possible to have the LEDs
     defined with any sort of mix between the methods.  The only restriction
     is that a GPIO pin cannot be mapped by two different (gpio)leds.

     For more details about the gpios property, please consult

     The property name is the arbitrary name of the device in /dev/led/ to
     create for led(4).

     fdt(4), gpio(4), gpioiic(4), led(4)

     The gpioled manual page first appeared in FreeBSD 10.1.

     This manual page was written by Luiz Otavio O Souza.

FreeBSD 11.1-RELEASE-p4          May 14, 2014          FreeBSD 11.1-RELEASE-p4
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