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

From	David Lechner <david@lechnology.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 3/3] Input: pwm-beeper: add optional enable gpio
Date	2017-01-06 18:50 +0100
Message-ID	<sWGOl-5dK-19@gated-at.bofh.it> (permalink)
References	<sWsLn-3qX-3@gated-at.bofh.it> <sWsLn-3qX-27@gated-at.bofh.it> <sWGuZ-569-1@gated-at.bofh.it>
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On 01/06/2017 11:28 AM, Andy Shevchenko wrote:
> On Fri, Jan 6, 2017 at 4:43 AM, David Lechner <david@lechnology.com> 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.
>

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[PATCH 0/3] Input: add optional enable gpio to pwm-beeper David Lechner <david@lechnology.com> - 2017-01-06 03:50 +0100
  [PATCH 3/3] Input: pwm-beeper: add optional enable gpio David Lechner <david@lechnology.com> - 2017-01-06 03:50 +0100
    Re: [PATCH 3/3] Input: pwm-beeper: add optional enable gpio Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-01-06 18:30 +0100
      Re: [PATCH 3/3] Input: pwm-beeper: add optional enable gpio David Lechner <david@lechnology.com> - 2017-01-06 18:50 +0100

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