Re: [PATCH 3/3] Input: pwm-beeper: add optional enable gpio

[David Lechner]

On 01/06/2017 11:28 AM, Andy Shevchenko wrote:
> 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?

You may want to turn if off when not making a sound to save power.


> > For
> > example, there may be an amplifier that is not always powered on.
>
> This looks like GPIO based fixed voltage regulator.


Yes, I think a regulator could work here just as well.

> > 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.