PCI: add some sysfs ABI docs

Add sysfs ABI docs for driver entries bind, unbind and new_id.  These
entries are pretty old, from 2.6.0 onwards AFAIK, so this documents
current behaviour.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Jesse Barnes <jbarnes@hobbes.lan>

diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index ceddcff4082a0cfc2bdc692148ec455bb9e165f0..e638e15a8895abef445cedccb2df273f1e3ad0e1 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -1,3 +1,46 @@
+What:          /sys/bus/pci/drivers/.../bind
+Date:          December 2003
+Contact:       linux-pci@vger.kernel.org
+Description:
+               Writing a device location to this file will cause
+               the driver to attempt to bind to the device found at
+               this location.  This is useful for overriding default
+               bindings.  The format for the location is: DDDD:BB:DD.F.
+               That is Domain:Bus:Device.Function and is the same as
+               found in /sys/bus/pci/devices/.  For example:
+               # echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/bind
+               (Note: kernels before 2.6.28 may require echo -n).
+
+What:          /sys/bus/pci/drivers/.../unbind
+Date:          December 2003
+Contact:       linux-pci@vger.kernel.org
+Description:
+               Writing a device location to this file will cause the
+               driver to attempt to unbind from the device found at
+               this location.  This may be useful when overriding default
+               bindings.  The format for the location is: DDDD:BB:DD.F.
+               That is Domain:Bus:Device.Function and is the same as
+               found in /sys/bus/pci/devices/. For example:
+               # echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/unbind
+               (Note: kernels before 2.6.28 may require echo -n).
+
+What:          /sys/bus/pci/drivers/.../new_id
+Date:          December 2003
+Contact:       linux-pci@vger.kernel.org
+Description:
+               Writing a device ID to this file will attempt to
+               dynamically add a new device ID to a PCI device driver.
+               This may allow the driver to support more hardware than
+               was included in the driver's static device ID support
+               table at compile time.  The format for the device ID is:
+               VVVV DDDD SVVV SDDD CCCC MMMM PPPP.  That is Vendor ID,
+               Device ID, Subsystem Vendor ID, Subsystem Device ID,
+               Class, Class Mask, and Private Driver Data.  The Vendor ID
+               and Device ID fields are required, the rest are optional.
+               Upon successfully adding an ID, the driver will probe
+               for the device and attempt to bind to it.  For example:
+               # echo "8086 10f5" > /sys/bus/pci/drivers/foo/new_id
+
 What:          /sys/bus/pci/devices/.../vpd
 Date:          February 2008
 Contact:       Ben Hutchings <bhutchings@solarflare.com>