video: ARM CLCD: use panel device node for panel initialization

There is no necessity to pass an endpoint device node to custom panel
initialization functions, because a child panel device node should be
sufficient, note that the existing init_panel() callback declaration from
linux/amba/clcd.h already prompts to use the panel device node here.

Cc: Tomi Valkeinen <[e-mail]>
Cc: Russell King <[e-mail]>
Cc: Linus Walleij <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Signed-off-by: Vladimir Zapolskiy <[e-mail]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[e-mail]>

drivers/video/fbdev/amba-clcd-nomadik.c

···
 	board->disable = tpg110_disable;
 }
 
-int nomadik_clcd_init_panel(struct clcd_fb *fb,
-			    struct device_node *endpoint)
+int nomadik_clcd_init_panel(struct clcd_fb *fb, struct device_node *panel)
 {
-	struct device_node *panel;
-
-	panel = of_graph_get_remote_port_parent(endpoint);
-	if (!panel)
-		return -ENODEV;
-
 	if (of_device_is_compatible(panel, "tpo,tpg110"))
 		tpg110_init(&fb->dev->dev, panel, fb->board);
 	else

drivers/video/fbdev/amba-clcd-nomadik.h

···
 #ifdef CONFIG_ARCH_NOMADIK
 int nomadik_clcd_init_board(struct amba_device *adev,
 			     struct clcd_board *board);
-int nomadik_clcd_init_panel(struct clcd_fb *fb,
-			    struct device_node *endpoint);
+int nomadik_clcd_init_panel(struct clcd_fb *fb, struct device_node *panel);
 #else
 static inline int nomadik_clcd_init_board(struct amba_device *adev,
 					  struct clcd_board *board)
···
 	return 0;
 }
 static inline int nomadik_clcd_init_panel(struct clcd_fb *fb,
-					  struct device_node *endpoint)
+					  struct device_node *panel)
 {
 	return 0;
 }

drivers/video/fbdev/amba-clcd-versatile.c

···
 	},
 };
 
-static void versatile_panel_probe(struct device *dev,
-				  struct device_node *endpoint)
+static void versatile_panel_probe(struct device *dev, struct device_node *panel)
 {
 	struct versatile_panel const *vpanel = NULL;
-	struct device_node *panel = NULL;
 	u32 val;
 	int ret;
 	int i;
···
 		return;
 	}
 
-	panel = of_graph_get_remote_port_parent(endpoint);
-	if (!panel) {
-		dev_err(dev, "could not locate panel in DT\n");
-		return;
-	}
 	if (!of_device_is_compatible(panel, vpanel->compatible))
 		dev_err(dev, "panel in DT is not compatible with the "
 			"auto-detected panel, continuing anyway\n");
···
 	}
 }
 
-int versatile_clcd_init_panel(struct clcd_fb *fb,
-			      struct device_node *endpoint)
+int versatile_clcd_init_panel(struct clcd_fb *fb, struct device_node *panel)
 {
 	const struct of_device_id *clcd_id;
 	enum versatile_clcd versatile_clcd_type;
···
 		fb->board->enable = versatile_clcd_enable;
 		fb->board->disable = versatile_clcd_disable;
 		fb->board->decode = versatile_clcd_decode;
-		versatile_panel_probe(dev, endpoint);
+		versatile_panel_probe(dev, panel);
 		dev_info(dev, "set up callbacks for Versatile\n");
 		break;
 	case REALVIEW_CLCD_EB:

drivers/video/fbdev/amba-clcd-versatile.h

···
 #include <linux/platform_data/video-clcd-versatile.h>
 
 #if defined(CONFIG_PLAT_VERSATILE_CLCD) && defined(CONFIG_OF)
-int versatile_clcd_init_panel(struct clcd_fb *fb,
-			      struct device_node *endpoint);
+int versatile_clcd_init_panel(struct clcd_fb *fb, struct device_node *panel);
 #else
 static inline int versatile_clcd_init_panel(struct clcd_fb *fb,
-				struct device_node *endpoint)
+					    struct device_node *panel)
 {
 	return 0;
 }

drivers/video/fbdev/amba-clcd.c

···
 
 static int clcdfb_of_init_display(struct clcd_fb *fb)
 {
-	struct device_node *endpoint;
+	struct device_node *endpoint, *panel;
 	int err;
 	unsigned int bpp;
 	u32 max_bandwidth;
···
 	if (!endpoint)
 		return -ENODEV;
 
+	panel = of_graph_get_remote_port_parent(endpoint);
+	if (!panel)
+		return -ENODEV;
+
 	if (fb->vendor->init_panel) {
-		err = fb->vendor->init_panel(fb, endpoint);
+		err = fb->vendor->init_panel(fb, panel);
 		if (err)
 			return err;
 	}