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usb: chipidea: core: add sysfs group

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Sometimes, the user needs to adjust some properties for controllers, eg
the role for controller, we add sysfs group for them.

The attribute 'role' is used to switch host/gadget role dynamically, the
uewr can read the current role, and write the other role compare to
current one to finish the switch.

Signed-off-by: Peter Chen <peter.chen@nxp.com>
This commit is contained in:
Peter Chen
2017-03-27 10:54:27 +08:00
parent 4f4555cfe7
commit a932a8041f
3 changed files with 72 additions and 3 deletions
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Documentation/ABI/testing/sysfs-platform-chipidea-usb2 Normal file
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What: /sys/bus/platform/devices/ci_hdrc.0/role
Date: Mar 2017
Contact: Peter Chen <peter.chen@nxp.com>
Description:
It returns string "gadget" or "host" when read it, it indicates
current controller role.
It will do role switch when write "gadget" or "host" to it.
Only controller at dual-role configuration supports writing.