ARM: OMAP4: display: convert display to use syscon for dsi muxing

The legacy control module APIs will be gone, thus convert the display
driver to use syscon. This change should eventually be moved to
display driver from the board directory.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>

arch/arm/mach-omap2/display.c

@@ -26,6 +26,8 @@
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/slab.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include <video/omapdss.h>
 #include "omap_hwmod.h"
@@ -104,6 +106,10 @@ static const struct omap_dss_hwmod_data omap4_dss_hwmod_data[] __initconst = {
 	{ "dss_hdmi", "omapdss_hdmi", -1 },
 };
 
+#define OMAP4_DSIPHY_SYSCON_OFFSET		0x78
+
+static struct regmap *omap4_dsi_mux_syscon;
+
 static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes)
 {
 	u32 enable_mask, enable_shift;
@@ -124,7 +130,7 @@ static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes)
 		return -ENODEV;
 	}
 
-	reg = omap4_ctrl_pad_readl(OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_DSIPHY);
+	regmap_read(omap4_dsi_mux_syscon, OMAP4_DSIPHY_SYSCON_OFFSET, &reg);
 
 	reg &= ~enable_mask;
 	reg &= ~pipd_mask;
@@ -132,7 +138,7 @@ static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes)
 	reg |= (lanes << enable_shift) & enable_mask;
 	reg |= (lanes << pipd_shift) & pipd_mask;
 
-	omap4_ctrl_pad_writel(reg, OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_DSIPHY);
+	regmap_write(omap4_dsi_mux_syscon, OMAP4_DSIPHY_SYSCON_OFFSET, reg);
 
 	return 0;
 }
@@ -665,5 +671,10 @@ int __init omapdss_init_of(void)
 		return r;
 	}
 
+	/* add DSI info for omap4 */
+	node = of_find_node_by_name(NULL, "omap4_padconf_global");
+	if (node)
+		omap4_dsi_mux_syscon = syscon_node_to_regmap(node);
+
 	return 0;
 }