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

[Tabi Timur-B04825 <B04825@freescale.com>]

Mark Brown wrote:
> 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 Frees=
cale
>> 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.

I didn't see any way to interface the hardware to the hwmon layer in a=20
manner that provides the information that our customers went using this=20
hardware.

>> The DCM collects and tallies data over a period of time in the backgroun=
d,
>> without utilizing any resources on the host (CPU, memory, etc).  The dat=
a is
>> summarized and made available when data collection stops.  This allows p=
ower
>> consumption to be measured while the host is performing some tasks (usua=
lly
>> 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.

Can you show an example or some documentation?  I couldn't find anything=20
remotely like that.  I don't even see anything that lets me start/stop=20
monitoring of sensors.

--=20
Timur Tabi
Linux kernel developer at Freescale=