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On STM32 DMA3, channels can be reserved, so they are non available for Linux. This non-availability creates a mismatch between dma_chan id and DMA3 channel id. Use dma_async_device_channel_register() to register the channels after controller registration and change the default channel name, so that it can match the name in the Reference Manual and ease requesting a channel thanks to its name. Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com> Link: https://lore.kernel.org/r/20240531150712.2503554-12-amelie.delaunay@foss.st.com Signed-off-by: Vinod Koul <vkoul@kernel.org>