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linux-imx/Documentation/ABI/testing/sysfs-class-stm
Alexander Shishkin 8e996a2874 stm class: Support devices that override software assigned masters 
Some STM devices adjust software assigned master numbers depending on
the trace source and its runtime state and whatnot. This patch adds
a sysfs attribute to inform the trace-side software that master numbers
assigned to software sources will not match those in the STP stream,
so that, for example, master/channel allocation policy can be adjusted
accordingly.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-05-03 14:59:30 -07:00

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What: /sys/class/stm//masters Date: June 2015 KernelVersion: 4.3 Contact: Alexander Shishkin alexander.shishkin@linux.intel.com Description: Shows first and last available to software master numbers on this STM device.

What: /sys/class/stm//channels Date: June 2015 KernelVersion: 4.3 Contact: Alexander Shishkin alexander.shishkin@linux.intel.com Description: Shows the number of channels per master on this STM device.

What: /sys/class/stm//hw_override Date: March 2016 KernelVersion: 4.7 Contact: Alexander Shishkin alexander.shishkin@linux.intel.com Description: Reads as 0 if master numbers in the STP stream produced by this stm device will match the master numbers assigned by the software or 1 if the stm hardware overrides software assigned masters.