1*4882a593SmuzhiyunWhat: /sys/bus/amba/devices/.../driver_override 2*4882a593SmuzhiyunDate: September 2014 3*4882a593SmuzhiyunContact: Antonios Motakis <a.motakis@virtualopensystems.com> 4*4882a593SmuzhiyunDescription: 5*4882a593Smuzhiyun This file allows the driver for a device to be specified which 6*4882a593Smuzhiyun will override standard OF, ACPI, ID table, and name matching. 7*4882a593Smuzhiyun When specified, only a driver with a name matching the value 8*4882a593Smuzhiyun written to driver_override will have an opportunity to bind to 9*4882a593Smuzhiyun the device. The override is specified by writing a string to the 10*4882a593Smuzhiyun driver_override file (echo vfio-amba > driver_override) and may 11*4882a593Smuzhiyun be cleared with an empty string (echo > driver_override). 12*4882a593Smuzhiyun This returns the device to standard matching rules binding. 13*4882a593Smuzhiyun Writing to driver_override does not automatically unbind the 14*4882a593Smuzhiyun device from its current driver or make any attempt to 15*4882a593Smuzhiyun automatically load the specified driver. If no driver with a 16*4882a593Smuzhiyun matching name is currently loaded in the kernel, the device will 17*4882a593Smuzhiyun not bind to any driver. This also allows devices to opt-out of 18*4882a593Smuzhiyun driver binding using a driver_override name such as "none". 19*4882a593Smuzhiyun Only a single driver may be specified in the override, there is 20*4882a593Smuzhiyun no support for parsing delimiters. 21