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What: /sys/bus/platform/devices/.../driver_override
Date: April 2014
Contact: Kim Phillips <>
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.
What: /sys/bus/platform/devices/.../numa_node
Date: June 2020
Contact: Barry Song <>
This file contains the NUMA node to which the platform device
is attached. It won't be visible if the node is unknown. The
value comes from an ACPI _PXM method or a similar firmware
source. Initial users for this file would be devices like
arm smmu which are populated by arm64 acpi_iort.
What: /sys/bus/platform/devices/.../msi_irqs/
Date: August 2021
Contact: Barry Song <>
The /sys/devices/.../msi_irqs directory contains a variable set
of files, with each file being named after a corresponding msi
irq vector allocated to that device.
What: /sys/bus/platform/devices/.../msi_irqs/<N>
Date: August 2021
Contact: Barry Song <>
This attribute will show "msi" if <N> is a valid msi irq
What: /sys/bus/platform/devices/.../modalias
Same as MODALIAS in the uevent at device creation.
A platform device that it is exposed via devicetree uses:
- of:N`of node name`T`type`
Other platform devices use, instead:
- platform:`driver name`