[PATCH] dmaengine: sh: rcar-dmac: add comment for r8a779a0 compatible

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Add the reason why we need r8a779a0 compatible.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
Hmm... It seems I didn't send this patch yesterday... (?)

 drivers/dma/sh/rcar-dmac.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index 1094a2f821649..c712e66641696 100644
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -2023,6 +2023,10 @@ static const struct of_device_id rcar_dmac_of_ids[] = {
 		.compatible = "renesas,rcar-gen4-dmac",
 		.data = &rcar_gen4_dmac_data,
 	}, {
+		/*
+		 * Backward compatibility for between v5.12 - v5.19
+		 * which didn't combined with "renesas,rcar-gen4-dmac"
+		 */
 		.compatible = "renesas,dmac-r8a779a0",
 		.data = &rcar_gen4_dmac_data,
 	},
-- 
2.43.0





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