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[RFC,v5,1/4] driver core: Add dev_set_drv_sync_state()

Message ID 20230621144019.3219858-2-abel.vesa@linaro.org
State New
Headers show
Series PM: domain: Support skiping disabling unused domains until sync state | expand

Commit Message

Abel Vesa June 21, 2023, 2:40 p.m. UTC 
From: Saravana Kannan <saravanak@google.com>

This can be used by frameworks to set the sync_state() helper functions
for drivers that don't already have them set.

Signed-off-by: Saravana Kannan <saravanak@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 include/linux/device.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/include/linux/device.h b/include/linux/device.h
index 66c13965153d..bae11928ef7e 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -995,6 +995,18 @@  static inline bool dev_has_sync_state(struct device *dev)
 	return false;
 }
 
+static inline int dev_set_drv_sync_state(struct device *dev,
+					 void (*fn)(struct device *dev))
+{
+	if (!dev || !dev->driver)
+		return 0;
+	if (dev->driver->sync_state && dev->driver->sync_state != fn)
+		return -EBUSY;
+	if (!dev->driver->sync_state)
+		dev->driver->sync_state = fn;
+	return 0;
+}
+
 static inline void dev_set_removable(struct device *dev,
 				     enum device_removable removable)
 {