dmaengine: shdma: Add more register documentation

Also add a few definitions that were missing.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 13 insertions, 11 deletions

diff --git a/include/linux/sh_dma.h b/include/linux/sh_dma.h
index b7b43b82231e..56b97eed28a4 100644
--- a/include/linux/sh_dma.h
+++ b/include/linux/sh_dma.h
@@ -95,19 +95,21 @@ struct sh_dmae_pdata {
 };
 
 /* DMAOR definitions */
-#define DMAOR_AE        0x00000004
+#define DMAOR_AE        0x00000004      /* Address Error Flag */
 #define DMAOR_NMIF      0x00000002
-#define DMAOR_DME       0x00000001
+#define DMAOR_DME       0x00000001      /* DMA Master Enable */
 
 /* Definitions for the SuperH DMAC */
-#define DM_INC  0x00004000
-#define DM_DEC  0x00008000
-#define DM_FIX  0x0000c000
-#define SM_INC  0x00001000
-#define SM_DEC  0x00002000
-#define SM_FIX  0x00003000
-#define CHCR_DE 0x00000001
-#define CHCR_TE 0x00000002
-#define CHCR_IE 0x00000004
+#define DM_INC  0x00004000      /* Destination addresses are incremented */
+#define DM_DEC  0x00008000      /* Destination addresses are decremented */
+#define DM_FIX  0x0000c000      /* Destination address is fixed */
+#define SM_INC  0x00001000      /* Source addresses are incremented */
+#define SM_DEC  0x00002000      /* Source addresses are decremented */
+#define SM_FIX  0x00003000      /* Source address is fixed */
+#define RS_AUTO 0x00000400      /* Auto Request */
+#define RS_ERS  0x00000800      /* DMA extended resource selector */
+#define CHCR_DE 0x00000001      /* DMA Enable */
+#define CHCR_TE 0x00000002      /* Transfer End Flag */
+#define CHCR_IE 0x00000004      /* Interrupt Enable */
 
 #endif