Thanks Robert. In am335x-evmsk.dts, there is leds definition:
leds {
pinctrl-names = "default", "sleep";
pinctrl-0 = <&user_leds_default>;
pinctrl-1 = <&user_leds_sleep>;
compatible = "gpio-leds";
led@1 {
label = "evmsk:green:usr0";
gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
default-state = "off";
};
led@2 {
label = "evmsk:green:usr1";
gpios = <&gpio1 5 GPIO_ACTIVE_HIGH>;
default-state = "off";
};
led@3 {
label = "evmsk:green:mmc0";
gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
linux,default-trigger = "mmc0";
default-state = "off";
};
led@4 {
label = "evmsk:green:heartbeat";
gpios = <&gpio1 7 GPIO_ACTIVE_HIGH>;
linux,default-trigger = "heartbeat";
default-state = "off";
};
};
On this board, there is no gpio when running lsmod. Does this .dts file
tell me something?
I am new to this topic.
*Just actually look at the kernel dts file for you board.*
The above leds in .dts tells me something?
Thanks,
On Mon, Sep 7, 2015 at 11:05 AM, Robert Nelson <[email protected]>
wrote:
>
> On Sep 7, 2015 9:32 AM, "RJ Wang" <[email protected]> wrote:
> >
> > On link
> > https://www.kernel.org/doc/Documentation/gpio/sysfs.txt
> > it is talked about gpio
> >
> > It has comments:
> >
> > Note that standard kernel drivers exist for common "LEDs and Buttons"
> > GPIO tasks: "leds-gpio" and "gpio_keys", respectively. Use those
> > instead of talking directly to the GPIOs; they integrate with kernel
> > frameworks better than your userspace code could.
> >
> >
> > What category does GPIO in BeagleBone Black belong to?
>
> Led-gpio
>
> >
> > What is about the built-in GPIO in my AM3358 SK board?
>
> Just actually look at the kernel dts file for you board.
>
> Regards,
>
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