driver core: Add dev_set_drv_sync_state()

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>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Tested-by: Hiago De Franco <hiago.franco@toradex.com> # Colibri iMX8X
Tested-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> # TI AM62A,Xilinx ZynqMP ZCU106
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20250701114733.636510-20-ulf.hansson@linaro.org

diff --git a/include/linux/device.h b/include/linux/device.h
index 315b0017133554f6ec3d6ff9e9b47e305ddccdb8..686f2a578fbd64a226b615265d638167d6d5712a 100644 (file)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -917,6 +917,18 @@ 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)
 {