ARM: OMAP2+: add omapdss_init_of()

The OMAP display architecture requires a bunch of platform devices which
are not created via .dts (for now). We also need to pass a few function
pointers and the DSS hardware version from the arch code to omapdss
driver.

This patch adds omapdss_init_of() function, called from board-generic at
init time, which handles those tasks.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Archit Taneja <archit@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-generic.c

@@ -36,6 +36,8 @@ static struct of_device_id omap_dt_match_table[] __initdata = {
 static void __init omap_generic_init(void)
 {
 	pdata_quirks_init(omap_dt_match_table);
+
+	omapdss_init_of();
 }
 
 #ifdef CONFIG_SOC_OMAP2420

arch/arm/mach-omap2/common.h

@@ -315,5 +315,7 @@ extern int omap_dss_reset(struct omap_hwmod *);
 /* SoC specific clock initializer */
 int omap_clk_init(void);
 
+int __init omapdss_init_of(void);
+
 #endif /* __ASSEMBLER__ */
 #endif /* __ARCH_ARM_MACH_OMAP2PLUS_COMMON_H */

arch/arm/mach-omap2/display.c

@@ -23,6 +23,8 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
 
 #include <video/omapdss.h>
 #include "omap_hwmod.h"
@@ -552,3 +554,106 @@ int omap_dss_reset(struct omap_hwmod *oh)
 
 	return r;
 }
+
+struct device_node * __init omapdss_find_dss_of_node(void)
+{
+	struct device_node *node;
+
+	node = of_find_compatible_node(NULL, NULL, "ti,omap2-dss");
+	if (node)
+		return node;
+
+	node = of_find_compatible_node(NULL, NULL, "ti,omap3-dss");
+	if (node)
+		return node;
+
+	node = of_find_compatible_node(NULL, NULL, "ti,omap4-dss");
+	if (node)
+		return node;
+
+	return NULL;
+}
+
+int __init omapdss_init_of(void)
+{
+	int r;
+	enum omapdss_version ver;
+	struct device_node *node;
+	struct platform_device *pdev;
+
+	static struct omap_dss_board_info board_data = {
+		.dsi_enable_pads = omap_dsi_enable_pads,
+		.dsi_disable_pads = omap_dsi_disable_pads,
+		.get_context_loss_count = omap_pm_get_dev_context_loss_count,
+		.set_min_bus_tput = omap_dss_set_min_bus_tput,
+	};
+
+	/* only create dss helper devices if dss is enabled in the .dts */
+
+	node = omapdss_find_dss_of_node();
+	if (!node)
+		return 0;
+
+	if (!of_device_is_available(node))
+		return 0;
+
+	ver = omap_display_get_version();
+
+	if (ver == OMAPDSS_VER_UNKNOWN) {
+		pr_err("DSS not supported on this SoC\n");
+		return -ENODEV;
+	}
+
+	pdev = of_find_device_by_node(node);
+
+	if (!pdev) {
+		pr_err("Unable to find DSS platform device\n");
+		return -ENODEV;
+	}
+
+	r = of_platform_populate(node, NULL, NULL, &pdev->dev);
+	if (r) {
+		pr_err("Unable to populate DSS submodule devices\n");
+		return r;
+	}
+
+	board_data.version = ver;
+
+	omap_display_device.dev.platform_data = &board_data;
+
+	r = platform_device_register(&omap_display_device);
+	if (r < 0) {
+		pr_err("Unable to register omapdss device\n");
+		return r;
+	}
+
+	/* create DRM device */
+	r = omap_init_drm();
+	if (r < 0) {
+		pr_err("Unable to register omapdrm device\n");
+		return r;
+	}
+
+	/* create vrfb device */
+	r = omap_init_vrfb();
+	if (r < 0) {
+		pr_err("Unable to register omapvrfb device\n");
+		return r;
+	}
+
+	/* create FB device */
+	r = omap_init_fb();
+	if (r < 0) {
+		pr_err("Unable to register omapfb device\n");
+		return r;
+	}
+
+	/* create V4L2 display device */
+	r = omap_init_vout();
+	if (r < 0) {
+		pr_err("Unable to register omap_vout device\n");
+		return r;
+	}
+
+	return 0;
+}

arch/arm/mach-omap2/display.h

@@ -30,4 +30,7 @@ int omap_init_drm(void);
 int omap_init_vrfb(void);
 int omap_init_fb(void);
 int omap_init_vout(void);
+
+struct device_node * __init omapdss_find_dss_of_node(void);
+
 #endif

arch/arm/mach-omap2/dss-common.c

@@ -33,6 +33,7 @@
 #include "soc.h"
 #include "dss-common.h"
 #include "mux.h"
+#include "display.h"
 
 #define HDMI_GPIO_CT_CP_HPD 60 /* HPD mode enable/disable */
 #define HDMI_GPIO_LS_OE 41 /* Level shifter for HDMI */
@@ -101,6 +102,12 @@ static struct omap_dss_board_info omap4_panda_dss_data = {
 
 void __init omap4_panda_display_init_of(void)
 {
+	struct device_node *node;
+
+	node = omapdss_find_dss_of_node();
+	if (node && of_device_is_available(node))
+		return;
+
 	omap_display_init(&omap4_panda_dss_data);
 
 	platform_device_register(&omap4_panda_tfp410_device);
@@ -194,6 +201,11 @@ static struct omap_dss_board_info sdp4430_dss_data = {
 void __init omap_4430sdp_display_init_of(void)
 {
 	int r;
+	struct device_node *node;
+
+	node = omapdss_find_dss_of_node();
+	if (node && of_device_is_available(node))
+		return;
 
 	r = gpio_request_one(DISPLAY_SEL_GPIO, GPIOF_OUT_INIT_HIGH,
 			"display_sel");
@@ -252,6 +264,12 @@ static struct omap_dss_board_info igep2_dss_data = {
 
 void __init omap3_igep2_display_init_of(void)
 {
+	struct device_node *node;
+
+	node = omapdss_find_dss_of_node();
+	if (node && of_device_is_available(node))
+		return;
+
 	omap_display_init(&igep2_dss_data);
 
 	platform_device_register(&omap3_igep2_tfp410_device);