On Fri, Jan 6, 2017 at 4:43 AM, David Lechner <david@xxxxxxxxxxxxxx> wrote: > This adds an optional enable gpio to the pwm-beeper device. This gpio is > used in cases where the beeper needs to be switched on before using it. Isn't it a property of pin muxing? > For > example, there may be an amplifier that is not always powered on. This looks like GPIO based fixed voltage regulator. > > Tested on LEGO MINDSTORMS EV3, which has a speaker connected to PWM through > an amplifier. The amplifier has an enable pin that is connected to a gpio. -- With Best Regards, Andy Shevchenko -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
