iio: core: add iio_device_set_parent() helper (f5d01793) · Commits · 戴 / test

By default, the device allocation will also assign a parent device to the IIO device object. In cases where devm_iio_device_alloc() is used, sometimes the parent device must be different than the device used to manage the allocation. In that case, this helper should be used to change the parent, hence the requirement to call this between allocation & registration. This pattern/requirement is not very common in the IIO space, and it may be cleaned up later. But until then, assigning the parent manually between allocation & registration is slightly easier. Signed-off-by:

Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by:

Jonathan Cameron <Jonathan.Cameron@huawei.com>

include/linux/iio/iio.h

+20 −0

Original line number	Diff line number	Diff line
		@@ -649,6 +649,26 @@ static inline struct iio_dev iio_device_get(struct iio_dev indio_dev)
		return indio_dev ? dev_to_iio_dev(get_device(&indio_dev->dev)) : NULL;
		}

		/**
		* iio_device_set_parent() - assign parent device to the IIO device object
		* @indio_dev: IIO device structure
		* @parent: reference to parent device object
		*
		* This utility must be called between IIO device allocation
		* (via devm_iio_device_alloc()) & IIO device registration
		* (via {devm_}iio_device_register()).
		* By default, the device allocation will also assign a parent device to
		* the IIO device object. In cases where devm_iio_device_alloc() is used,
		* sometimes the parent device must be different than the device used to
		* manage the allocation.
		* In that case, this helper should be used to change the parent, hence the
		* requirement to call this between allocation & registration.
		**/
		static inline void iio_device_set_parent(struct iio_dev *indio_dev,
		struct device *parent)
		{
		indio_dev->dev.parent = parent;
		}

		/**
		* iio_device_set_drvdata() - Set device driver data

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