On Sun, May 26, 2024 at 08:17:17PM +0200, Thomas Weißschuh wrote: > +#if IS_ENABLED(CONFIG_MFD_CROS_EC_DEV) [...] > +static const struct keyboard_led_drvdata keyboard_led_drvdata_ec_pwm_mfd = { > + .init = keyboard_led_init_ec_pwm_mfd, > + .brightness_set_blocking = keyboard_led_set_brightness_ec_pwm, > + .brightness_get = keyboard_led_get_brightness_ec_pwm, They are only available if IS_ENABLED(CONFIG_CROS_EC).