[mirror_ubuntu-zesty-kernel.git] / Documentation / ABI / testing / sysfs-bus-amba

What:		/sys/bus/amba/devices/.../driver_override
Date:		September 2014
Contact:	Antonios Motakis <a.motakis@virtualopensystems.com>
Description:
		This file allows the driver for a device to be specified which
		will override standard OF, ACPI, ID table, and name matching.
		When specified, only a driver with a name matching the value
		written to driver_override will have an opportunity to bind to
		the device. The override is specified by writing a string to the
		driver_override file (echo vfio-amba > driver_override)	and may
		be cleared with an empty string (echo > driver_override).
		This returns the device to standard matching rules binding.
		Writing to driver_override does not automatically unbind the
		device from its current driver or make any attempt to
		automatically load the specified driver. If no driver with a
		matching name is currently loaded in the kernel, the device will
		not bind to any driver. This also allows devices to opt-out of
		driver binding using a driver_override name such as "none".
		Only a single driver may be specified in the override, there is
		no support for parsing delimiters.
Commit	Line	Data
3cf38571 AM	1	What: /sys/bus/amba/devices/.../driver_override
	2	Date: September 2014
	3	Contact: Antonios Motakis <a.motakis@virtualopensystems.com>
	4	Description:
	5	This file allows the driver for a device to be specified which
	6	will override standard OF, ACPI, ID table, and name matching.
	7	When specified, only a driver with a name matching the value
	8	written to driver_override will have an opportunity to bind to
	9	the device. The override is specified by writing a string to the
	10	driver_override file (echo vfio-amba > driver_override) and may
	11	be cleared with an empty string (echo > driver_override).
	12	This returns the device to standard matching rules binding.
	13	Writing to driver_override does not automatically unbind the
	14	device from its current driver or make any attempt to
	15	automatically load the specified driver. If no driver with a
	16	matching name is currently loaded in the kernel, the device will
	17	not bind to any driver. This also allows devices to opt-out of
	18	driver binding using a driver_override name such as "none".
	19	Only a single driver may be specified in the override, there is
	20	no support for parsing delimiters.