18c2ecf20Sopenharmony_ciWhat:		/sys/bus/platform/devices/.../driver_override
28c2ecf20Sopenharmony_ciDate:		April 2014
38c2ecf20Sopenharmony_ciContact:	Kim Phillips <kim.phillips@freescale.com>
48c2ecf20Sopenharmony_ciDescription:
58c2ecf20Sopenharmony_ci		This file allows the driver for a device to be specified which
68c2ecf20Sopenharmony_ci		will override standard OF, ACPI, ID table, and name matching.
78c2ecf20Sopenharmony_ci		When specified, only a driver with a name matching the value
88c2ecf20Sopenharmony_ci		written to driver_override will have an opportunity to bind
98c2ecf20Sopenharmony_ci		to the device.  The override is specified by writing a string
108c2ecf20Sopenharmony_ci		to the driver_override file (echo vfio-platform > \
118c2ecf20Sopenharmony_ci		driver_override) and may be cleared with an empty string
128c2ecf20Sopenharmony_ci		(echo > driver_override).  This returns the device to standard
138c2ecf20Sopenharmony_ci		matching rules binding.  Writing to driver_override does not
148c2ecf20Sopenharmony_ci		automatically unbind the device from its current driver or make
158c2ecf20Sopenharmony_ci		any attempt to automatically load the specified driver.  If no
168c2ecf20Sopenharmony_ci		driver with a matching name is currently loaded in the kernel,
178c2ecf20Sopenharmony_ci		the device will not bind to any driver.  This also allows
188c2ecf20Sopenharmony_ci		devices to opt-out of driver binding using a driver_override
198c2ecf20Sopenharmony_ci		name such as "none".  Only a single driver may be specified in
208c2ecf20Sopenharmony_ci		the override, there is no support for parsing delimiters.
218c2ecf20Sopenharmony_ci
228c2ecf20Sopenharmony_ciWhat:		/sys/bus/platform/devices/.../numa_node
238c2ecf20Sopenharmony_ciDate:		June 2020
248c2ecf20Sopenharmony_ciContact:	Barry Song <song.bao.hua@hisilicon.com>
258c2ecf20Sopenharmony_ciDescription:
268c2ecf20Sopenharmony_ci		This file contains the NUMA node to which the platform device
278c2ecf20Sopenharmony_ci		is attached. It won't be visible if the node is unknown. The
288c2ecf20Sopenharmony_ci		value comes from an ACPI _PXM method or a similar firmware
298c2ecf20Sopenharmony_ci		source. Initial users for this file would be devices like
308c2ecf20Sopenharmony_ci		arm smmu which are populated by arm64 acpi_iort.
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