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| author |   Saravana Kannan <saravanak@google.com> | 2019-09-04 14:11:21 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-04 17:29:50 +0200 |
| commit | e2ae9bcc4aaacda04edb75c4eea93384719efaa5 (patch) | |
| tree | 9c01d02d0a1e67c4de38c94e27180f9411fc850d /virt | |
| parent | driver core: Add fwnode_to_dev() to look up device from fwnode (diff) | |
| download | linux-dev-e2ae9bcc4aaacda04edb75c4eea93384719efaa5.tar.xz linux-dev-e2ae9bcc4aaacda04edb75c4eea93384719efaa5.zip | |
driver core: Add support for linking devices during device addition
The firmware corresponding to a device (dev.fwnode) might be able to
provide functional dependency information between a device and its
supplier and consumer devices. Tracking this functional dependency
allows optimizing device probe order and informing a supplier when all
its consumers have probed (and thereby actively managing their
resources).
The existing device links feature allows tracking and using
supplier-consumer relationships. So, this patch adds the add_links()
fwnode callback to allow firmware to create device links for each
device as the device is added.
However, when consumer devices are added, they might not have a supplier
device to link to despite needing mandatory resources/functionality from
one or more suppliers. A waiting_for_suppliers list is created to track
such consumers and retry linking them when new devices get added.
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20190904211126.47518-3-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'virt')
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