Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-platform b/Documentation/ABI/testing/sysfs-bus-platform
new file mode 100644
index 000000000..5172a6124
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-platform
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+What:		/sys/bus/platform/devices/.../driver_override
+Date:		April 2014
+Contact:	Kim Phillips <kim.phillips@freescale.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-platform > \
+		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.