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From: Martin Kepplinger <martink@posteo.de>
To: jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de,
	pmeerw@pmeerw.net, christoph.muellner@theobroma-systems.com,
	mfuzzey@parkeon.com
Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: iio: mma8452: power saving features for v4.7
Date: Thu,  3 Mar 2016 09:24:00 +0100	[thread overview]
Message-ID: <1456993444-21320-1-git-send-email-martink@posteo.de> (raw)

The accelerometers supported by mma8452 can use significantly less power if
configured accordingly. Let's make use of this:

 * add support for runtime power management
   (disabling the device after 2 seconds of inactivity), and
 * add a "power_modes" property to IIO sysfs, that offers a "low_power"
   *active* mode of operation that roughly consumes half the power of
   the default mode.

If you don't have CONFIG_PM enabled, by default nothing changes for you.

Here's how it's done and tested on MMA8653FC:

[PATCH 1/4] iio: mma8452: coding style fixes
[PATCH 2/4] iio: mma8452: avoid switching to active because of config
[PATCH 3/4] iio: mma8452: add support for runtime power management
[PATCH 4/4] iio: mma8452: add low_power mode

             reply	other threads:[~2016-03-03  8:25 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-03  8:24 Martin Kepplinger [this message]
2016-03-03  8:24 ` [PATCH 1/4] iio: mma8452: coding style fixes Martin Kepplinger
2016-03-05 17:19   ` Jonathan Cameron
2016-03-03  8:24 ` [PATCH 2/4] iio: mma8452: avoid switching to active because of config change Martin Kepplinger
2016-03-05 17:23   ` Jonathan Cameron
2016-03-03  8:24 ` [PATCH 3/4] iio: mma8452: add support for runtime power management Martin Kepplinger
2016-03-06 12:59   ` Jonathan Cameron
2016-03-03  8:24 ` [PATCH 4/4] iio: mma8452: add low_power mode Martin Kepplinger
2016-03-05 17:40   ` Jonathan Cameron
2016-03-06 15:49     ` Martin Kepplinger
2016-03-09 21:17       ` Jonathan Cameron

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