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The Allwinner A31 D-PHY supports both Rx and Tx modes. While the latter is already supported and used for MIPI DSI this adds support for the former, to be used with MIPI CSI-2. This implementation is inspired by Allwinner's V3s Linux SDK implementation, which was used as a documentation base. It uses the direction dt property to distinguish between tx and rx directions. Signed-off-by: Paul Kocialkowski <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Vinod Koul <[email protected]>