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. 21