OMAP: DSS2: Adding dss_features for independent core clk divider

In OMAP3xxx DISPC_DIVISOR register has a logical clock divisor (lcd_div)
field. The lcd_div is common, for deciding the DISPC core functional clock
frequency, and the final pixel clock frequency for LCD display.

In OMAP4, there are 2 LCD channels, hence two divisor registers, DISPC_DIVISOR1
and DISPC_DIVISOR2. Also, there is a third register DISPC_DIVISOR.

The DISPC_DIVISOR in OMAP4 is used to configure lcd_div exclusively for core
functional clock configuration. For pixel clock configuration of primary and
secondary LCDs, lcd_div of DISPC_DIVISOR1 and DISPC_DIVISOR2 are used
respectively

Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Raghuveer Murthy <raghuveer.murthy@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/dss_features.c

@@ -234,7 +234,8 @@ static struct omap_dss_features omap4_dss_features = {
 
 	.has_feature	=
 		FEAT_GLOBAL_ALPHA | FEAT_PRE_MULT_ALPHA |
-		FEAT_MGR_LCD2 | FEAT_GLOBAL_ALPHA_VID1,
+		FEAT_MGR_LCD2 | FEAT_GLOBAL_ALPHA_VID1 |
+		FEAT_CORE_CLK_DIV,
 
 	.num_mgrs = 3,
 	.num_ovls = 3,

drivers/video/omap2/dss/dss_features.h

@@ -36,6 +36,8 @@ enum dss_feat_id {
 	FEAT_LINEBUFFERSPLIT	= 1 << 8,
 	FEAT_ROWREPEATENABLE	= 1 << 9,
 	FEAT_RESIZECONF		= 1 << 10,
+	/* Independent core clk divider */
+	FEAT_CORE_CLK_DIV	= 1 << 11,
 };
 
 /* DSS register field id */