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Document RZ/G2L DMAC bindings. Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Reviewed-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20210806095322.2326-2-biju.das.jz@bp.renesas.com Signed-off-by: Vinod Koul <vkoul@kernel.org>