greybus: interface: document sysfs files

Yes, an interface has a device id sysfs file, so we need to document it.

Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
1 file changed
tree: 6bcbe2891fc79c5baca6435efd0bb1a6c954d7b4
  1. drivers/