iio: core: move @clock_id from struct iio_dev to struct iio_dev_opaque

There is already an acessor function used to access it, making this
move straight forward.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Link: https://lore.kernel.org/r/20210426174911.397061-10-jic23@kernel.org

drivers/iio/industrialio-core.c

@@ -271,13 +271,25 @@ int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
 		mutex_unlock(&indio_dev->mlock);
 		return -EBUSY;
 	}
-	indio_dev->clock_id = clock_id;
+	iio_dev_opaque->clock_id = clock_id;
 	mutex_unlock(&indio_dev->mlock);
 
 	return 0;
 }
 EXPORT_SYMBOL(iio_device_set_clock);
 
+/**
+ * iio_device_get_clock() - Retrieve current timestamping clock for the device
+ * @indio_dev: IIO device structure containing the device
+ */
+clockid_t iio_device_get_clock(const struct iio_dev *indio_dev)
+{
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+
+	return iio_dev_opaque->clock_id;
+}
+EXPORT_SYMBOL(iio_device_get_clock);
+
 /**
  * iio_get_time_ns() - utility function to get a time stamp for events etc
  * @indio_dev: device

include/linux/iio/iio-opaque.h

@@ -24,6 +24,7 @@
  * @legacy_scan_el_group:	attribute group for legacy scan elements attribute group
  * @legacy_buffer_group:	attribute group for legacy buffer attributes group
  * @scan_index_timestamp:	cache of the index to the timestamp
+ * @clock_id:			timestamping clock posix identifier
  * @chrdev:			associated character device
  * @flags:			file ops related flags including busy flag.
  * @debugfs_dentry:		device specific debugfs dentry
@@ -51,6 +52,7 @@ struct iio_dev_opaque {
 	struct attribute_group		legacy_buffer_group;
 
 	unsigned int			scan_index_timestamp;
+	clockid_t			clock_id;
 	struct cdev			chrdev;
 	unsigned long			flags;
 

include/linux/iio/iio.h

@@ -509,7 +509,6 @@ struct iio_buffer_setup_ops {
  * @name:		[DRIVER] name of the device.
  * @label:              [DRIVER] unique name to identify which device this is
  * @info:		[DRIVER] callbacks and constant info from driver
- * @clock_id:		[INTERN] timestamping clock posix identifier
  * @setup_ops:		[DRIVER] callbacks to call before and after buffer
  *			enable/disable
  * @priv:		[DRIVER] reference to driver's private information
@@ -538,7 +537,6 @@ struct iio_dev {
 	const char			*name;
 	const char			*label;
 	const struct iio_info		*info;
-	clockid_t			clock_id;
 	const struct iio_buffer_setup_ops	*setup_ops;
 
 	void				*priv;
@@ -589,15 +587,7 @@ static inline void iio_device_put(struct iio_dev *indio_dev)
 		put_device(&indio_dev->dev);
 }
 
-/**
- * iio_device_get_clock() - Retrieve current timestamping clock for the device
- * @indio_dev: IIO device structure containing the device
- */
-static inline clockid_t iio_device_get_clock(const struct iio_dev *indio_dev)
-{
-	return indio_dev->clock_id;
-}
-
+clockid_t iio_device_get_clock(const struct iio_dev *indio_dev);
 int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id);
 
 /**