linux-kernel - Re: [PATCH] drivers/misc: introduce Freescale Data Collection Manager driver

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Date:	Tue, 2 Aug 2011 00:46:45 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Timur Tabi <timur@...escale.com>
Cc:	arnd@...db.de, grant.likely@...retlab.ca, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/misc: introduce Freescale Data Collection
 Manager driver

On Mon, Aug 01, 2011 at 04:48:54PM -0500, Timur Tabi wrote:
> The Data Collection Manager (DCM) is a feature of the FPGA on some Freescale
> PowerPC reference boards that can read temperature, current, and voltage
> settings from the sensors on those boards.  This driver exposes the DCM via a
> sysfs interface (/sys/devices/platform/fsl-ocm.0).

This sounds like it should be a hwmon driver.

> The DCM collects and tallies data over a period of time in the background,
> without utilizing any resources on the host (CPU, memory, etc).  The data is
> summarized and made available when data collection stops.  This allows power
> consumption to be measured while the host is performing some tasks (usually
> a benchmark).

Though this is a bit odd for the subsystem I don't think it's too far
out of what other hwmon chips can do, some of them do have longer term
stats than just instantaneous readings.
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