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The iio_dmaengine_buffer_setup_ext() function is public and should be documented. Also, while touching this, fix the description of @dev in related functions. @dev does not strictly have to be the parent of the IIO device. It is only passed to dma_request_chan() so strictly speaking, it can be any device that is a valid DMA channel consumer. Signed-off-by: David Lechner <dlechner@baylibre.com> Link: https://patch.msgid.link/20241115-dlech-mainline-spi-engine-offload-2-v5-9-bea815bd5ea5@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>