[RFC PATCHv2 1/2] Export SoC info through sysfs

Ryan Mallon ryan at bluewatersys.com
Thu Apr 7 18:07:25 EDT 2011

On 04/08/2011 10:01 AM, Nicolas Pitre wrote:
> On Fri, 8 Apr 2011, Ryan Mallon wrote:
>> On 04/08/2011 09:29 AM, Arnd Bergmann wrote:
>>> I'll try to capture the opinions from the other people as well,
>>> hopefully this represents a consensus. Please correct me otherwise.
>>> I believe the uncontroversial parts are:
>>> * Make it not an entry but a device with certain properties.
>>> * Make the naming so that you can have more than one of them.
>>> * Put all devices on an SoC that uses this scheme underneath that
>>>   device by setting their parents to the SoC device.
>>> For the location of the device, I have not seen a clear consensus yet,
>>> but I'm fine with eihter of these:
>>> /sys/devices/soc/${NAME}/
>>> /sys/devices/platform/soc${NUMBER}/
>> I prefer the second format here since the path is always the same which
>> makes it easier to write parsing tools. The name should be an entry in
>> the directory rather than the name of the directory itself.
>> Probably SoC number should match CPU number for SMP machines right?
> Not really.  SOC means System On Chip.  you usually have only one SOC on 
> a board, and within that SOC you may have one or more CPUs.  SMP 
> machines are still likely to have only one SOC.

Ok. What is the situation where we have more than one SoC?


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