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| author | Saravana Kannan <saravanak@google.com> | 2019-10-28 15:00:22 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-02 18:05:17 +0100 |
| commit | 05ef983e0d65a31b370a4e1b93c1efd490ae778f (patch) | |
| tree | 2e49999b97c043175144b72615c337f4ad9a2e2f /include/linux/device.h | |
| parent | 8f677bc819e7a74cf10e30daf06e8b151d1e6a94 (diff) | |
| download | lwn-05ef983e0d65a31b370a4e1b93c1efd490ae778f.tar.gz lwn-05ef983e0d65a31b370a4e1b93c1efd490ae778f.zip | |
driver core: Add device link support for SYNC_STATE_ONLY flag
Parent devices might need to create "proxy" device links from themselves
to supplier devices to make sure the supplier devices don't get a
sync_state() before the child consumer devices get a chance to add
device links to the supplier devices.
However, the parent device has no real dependency on the supplier device
and probing, suspend/resume or runtime PM don't need to be affected by
the supplier device. To capture these cases, create a SYNC_STATE_ONLY
device link flag that only affects sync_state() behavior and doesn't
affect probing, suspend/resume or runtime PM.
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20191028220027.251605-2-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/device.h')
| -rw-r--r-- | include/linux/device.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/device.h b/include/linux/device.h index 6978bb471567..82890e1b8f08 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -1096,6 +1096,7 @@ enum device_link_state { * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind. * AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds. * MANAGED: The core tracks presence of supplier/consumer drivers (internal). + * SYNC_STATE_ONLY: Link only affects sync_state() behavior. */ #define DL_FLAG_STATELESS BIT(0) #define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1) @@ -1104,6 +1105,7 @@ enum device_link_state { #define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4) #define DL_FLAG_AUTOPROBE_CONSUMER BIT(5) #define DL_FLAG_MANAGED BIT(6) +#define DL_FLAG_SYNC_STATE_ONLY BIT(7) /** * struct device_link - Device link representation. |