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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-02-01 03:59:42 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-01 12:04:08 +0300
commite7dd40105aac9ba051e44ad711123bc53a5e4c71 (patch)
treebce4bbd7d389e5e84b369156f8ee266a906628ed /Documentation/driver-api/device_link.rst
parent72175d4ea4c442d95cf690c3e968eeee90fd43ca (diff)
downloadlinux-e7dd40105aac9ba051e44ad711123bc53a5e4c71.tar.xz
driver core: Add device link flag DL_FLAG_AUTOPROBE_CONSUMER
Add a new device link flag, DL_FLAG_AUTOPROBE_CONSUMER, to request the driver core to probe for a consumer driver automatically after binding a driver to the supplier device on a persistent managed device link. As unbinding the supplier driver on a managed device link causes the consumer driver to be detached from its device automatically, this flag provides a complementary mechanism which is needed to address some "composite device" use cases. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/driver-api/device_link.rst')
-rw-r--r--Documentation/driver-api/device_link.rst9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/driver-api/device_link.rst b/Documentation/driver-api/device_link.rst
index e249e074a8d2..c764755121c7 100644
--- a/Documentation/driver-api/device_link.rst
+++ b/Documentation/driver-api/device_link.rst
@@ -94,6 +94,15 @@ Similarly, when the device link is added from supplier's ``->probe`` callback,
``DL_FLAG_AUTOREMOVE_SUPPLIER`` causes the device link to be automatically
purged when the supplier fails to probe or later unbinds.
+If neither ``DL_FLAG_AUTOREMOVE_CONSUMER`` nor ``DL_FLAG_AUTOREMOVE_SUPPLIER``
+is set, ``DL_FLAG_AUTOPROBE_CONSUMER`` can be used to request the driver core
+to probe for a driver for the consumer driver on the link automatically after
+a driver has been bound to the supplier device.
+
+Note, however, that any combinations of ``DL_FLAG_AUTOREMOVE_CONSUMER``,
+``DL_FLAG_AUTOREMOVE_SUPPLIER`` or ``DL_FLAG_AUTOPROBE_CONSUMER`` with
+``DL_FLAG_STATELESS`` are invalid and cannot be used.
+
Limitations
===========