On Wed, May 14, 2014 at 11:32 AM, Javier Martinez Canillas
<[email protected]> wrote:
> I was wondering the same. Unfortunately writing a small device driver
> that uses gpiolib from the kernel is sometimes not possible for many
> companies.
This is one of the promises of device tree. Certainly customers of
a Linux BSP can make device trees.
So for a heartbeat LED on some GPIO for example, compile
in the necessary LED and trigger modules and:
leds {
compatible = "gpio-leds";
used-led {
label = "user_led";
gpios = <&gpio4 14 0x4>;
default-state = "on";
linux,default-trigger = "heartbeat";
};
};
Simple key input:
gpio_keys {
compatible = "gpio-keys";
#address-cells = <1>;
#size-cells = <0>;
button@1 {
debounce_interval = <50>;
wakeup = <1>;
linux,code = <2>;
label = "userpb";
gpios = <&gpio1 0 0x4>;
};
};
We need to enable users to use such stock items, not
teach them to shoot themselves in the foot in userspace.
Yours,
Linus Walleij
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