debugfs: add 9p device interface

The 9p interface provides abstraction layers allowing the software
that uses devices to be independent from the hardware.

This patch provides a file system abstraction to link drivers to their
devices and propose a common interface to expose driver operations to
higher layers. This file system can be used to access and configure a
device by doing read/write operations.

Signed-off-by: Ambroise Vincent <>
Signed-off-by: Olivier Deprez <>
Change-Id: Ia9662393baf489855dc0c8f389fe4a0afbc9c255
10 files changed