drm: rcar-du: dsi: Add r8A779g0 support

Add DSI support for r8a779g0. The main differences to r8a779a0 are in
the PLL and PHTW setups.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h

@@ -122,7 +122,8 @@
 #define VCLKSET_CKEN			(1 << 16)
 #define VCLKSET_COLOR_RGB		(0 << 8)
 #define VCLKSET_COLOR_YCC		(1 << 8)
-#define VCLKSET_DIV(x)			(((x) & 0x3) << 4)
+#define VCLKSET_DIV_V3U(x)		(((x) & 0x3) << 4)
+#define VCLKSET_DIV_V4H(x)		(((x) & 0x7) << 4)
 #define VCLKSET_BPP_16			(0 << 2)
 #define VCLKSET_BPP_18			(1 << 2)
 #define VCLKSET_BPP_18L			(2 << 2)
@@ -166,6 +167,9 @@
 #define PHTW_CWEN			(1 << 8)
 #define PHTW_TESTDIN_CODE(x)		(((x) & 0xff) << 0)
 
+#define PHTR				0x1038
+#define PHTR_TEST			(1 << 16)
+
 #define PHTC				0x103c
 #define PHTC_TESTCLR			(1 << 0)