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Needed by platform device drivers, such as the upcoming vfio-platform driver, in order to bypass the existing OF, ACPI, id_table and name string matches, and successfully be able to be bound to any device, like so: echo vfio-platform > /sys/bus/platform/devices/fff51000.ethernet/driver_override echo fff51000.ethernet > /sys/bus/platform/devices/fff51000.ethernet/driver/unbind echo fff51000.ethernet > /sys/bus/platform/drivers_probe This mimics "PCI: Introduce new device binding path using pci_dev.driver_override", which is an interface enhancement for more deterministic PCI device binding, e.g., when in the presence of hotplug. Reviewed-by: Alex Williamson <alex.williamson@redhat.com> Reviewed-by: Alexander Graf <agraf@suse.de> Reviewed-by: Stuart Yoder <stuart.yoder@freescale.com> Signed-off-by: Kim Phillips <kim.phillips@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
21 lines
1.1 KiB
Plaintext
21 lines
1.1 KiB
Plaintext
What: /sys/bus/platform/devices/.../driver_override
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Date: April 2014
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Contact: Kim Phillips <kim.phillips@freescale.com>
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Description:
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This file allows the driver for a device to be specified which
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will override standard OF, ACPI, ID table, and name matching.
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When specified, only a driver with a name matching the value
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written to driver_override will have an opportunity to bind
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to the device. The override is specified by writing a string
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to the driver_override file (echo vfio-platform > \
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driver_override) and may be cleared with an empty string
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(echo > driver_override). This returns the device to standard
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matching rules binding. Writing to driver_override does not
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automatically unbind the device from its current driver or make
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any attempt to automatically load the specified driver. If no
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driver with a matching name is currently loaded in the kernel,
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the device will not bind to any driver. This also allows
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devices to opt-out of driver binding using a driver_override
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name such as "none". Only a single driver may be specified in
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the override, there is no support for parsing delimiters.
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