OMAPDSS: DPI: fix dpi_get_dsidev() for omap5

On OMAP5 the DISPC channels and DSI PLLs are not connected the same way.
LCD2 on OMAP5 cannot use any DSI PLL as a source clock, but LCD3 can use
DSI2's PLL.

This patch fixes dpi_get_dsidev() by adding separate case for OMAP5 to
handle the difference.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Archit Taneja <archit@ti.com>

drivers/video/omap2/dss/dpi.c

@@ -63,18 +63,32 @@ static struct platform_device *dpi_get_dsidev(enum omap_channel channel)
 	case OMAPDSS_VER_OMAP3630:
 	case OMAPDSS_VER_AM35xx:
 		return NULL;
+
+	case OMAPDSS_VER_OMAP4430_ES1:
+	case OMAPDSS_VER_OMAP4430_ES2:
+	case OMAPDSS_VER_OMAP4:
+		switch (channel) {
+		case OMAP_DSS_CHANNEL_LCD:
+			return dsi_get_dsidev_from_id(0);
+		case OMAP_DSS_CHANNEL_LCD2:
+			return dsi_get_dsidev_from_id(1);
 		default:
-		break;
+			return NULL;
 		}
 
+	case OMAPDSS_VER_OMAP5:
 		switch (channel) {
 		case OMAP_DSS_CHANNEL_LCD:
 			return dsi_get_dsidev_from_id(0);
-	case OMAP_DSS_CHANNEL_LCD2:
+		case OMAP_DSS_CHANNEL_LCD3:
 			return dsi_get_dsidev_from_id(1);
 		default:
 			return NULL;
 		}
+
+	default:
+		return NULL;
+	}
 }
 
 static enum omap_dss_clk_source dpi_get_alt_clk_src(enum omap_channel channel)