drm/omap: dss: Add for_each_dss_output() macro

Similarly to for_each_dss_display(), the for_each_dss_output() macro
iterates over all the DSS connected outputs.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/base.c

@@ -126,12 +126,13 @@ struct omap_dss_device *omapdss_find_device_by_port(struct device_node *src,
 }
 
 /*
- * Search for the next device starting at @from. If display_only is true, skip
- * non-display devices. Release the reference to the @from device, and acquire
- * a reference to the returned device if found.
+ * Search for the next device starting at @from. The type argument specfies
+ * which device types to consider when searching. Searching for multiple types
+ * is supported by and'ing their type flags. Release the reference to the @from
+ * device, and acquire a reference to the returned device if found.
  */
 struct omap_dss_device *omapdss_device_get_next(struct omap_dss_device *from,
-						bool display_only)
+						enum omap_dss_device_type type)
 {
 	struct omap_dss_device *dssdev;
 	struct list_head *list;
@@ -159,8 +160,14 @@ struct omap_dss_device *omapdss_device_get_next(struct omap_dss_device *from,
 			goto done;
 		}
 
-		/* Filter out non-display entries if display_only is set. */
-		if (!display_only || dssdev->driver)
+		/*
+		 * Accept display entities if the display type is requested,
+		 * and output entities if the output type is requested.
+		 */
+		if ((type & OMAP_DSS_DEVICE_TYPE_DISPLAY) && dssdev->driver)
+			goto done;
+		if ((type & OMAP_DSS_DEVICE_TYPE_OUTPUT) && dssdev->id &&
+		    dssdev->next)
 			goto done;
 	}
 

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -385,6 +385,11 @@ struct omap_dss_device_ops {
 	};
 };
 
+enum omap_dss_device_type {
+	OMAP_DSS_DEVICE_TYPE_OUTPUT = (1 << 0),
+	OMAP_DSS_DEVICE_TYPE_DISPLAY = (1 << 1),
+};
+
 struct omap_dss_device {
 	struct kobject kobj;
 	struct device *dev;
@@ -488,9 +493,9 @@ static inline bool omapdss_is_initialized(void)
 	return !!omapdss_get_dss();
 }
 
-void omapdss_display_init(struct omap_dss_device *dssdev);
 #define for_each_dss_display(d) \
-	while ((d = omapdss_device_get_next(d, true)) != NULL)
+	while ((d = omapdss_device_get_next(d, OMAP_DSS_DEVICE_TYPE_DISPLAY)) != NULL)
+void omapdss_display_init(struct omap_dss_device *dssdev);
 
 void omapdss_device_register(struct omap_dss_device *dssdev);
 void omapdss_device_unregister(struct omap_dss_device *dssdev);
@@ -499,7 +504,7 @@ void omapdss_device_put(struct omap_dss_device *dssdev);
 struct omap_dss_device *omapdss_find_device_by_port(struct device_node *src,
 						    unsigned int port);
 struct omap_dss_device *omapdss_device_get_next(struct omap_dss_device *from,
-						bool display_only);
+						enum omap_dss_device_type type);
 int omapdss_device_connect(struct dss_device *dss,
 			   struct omap_dss_device *src,
 			   struct omap_dss_device *dst);
@@ -511,6 +516,8 @@ int omap_dss_get_num_overlay_managers(void);
 
 int omap_dss_get_num_overlays(void);
 
+#define for_each_dss_output(d) \
+	while ((d = omapdss_device_get_next(d, OMAP_DSS_DEVICE_TYPE_OUTPUT)) != NULL)
 int omapdss_output_set_device(struct omap_dss_device *out,
 		struct omap_dss_device *dssdev);
 int omapdss_output_unset_device(struct omap_dss_device *out);