Merge branch 'component-for-staging' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into staging-next

Russell writes:

This updates imx-drm for the recently merged updates to the component
helper, and as such is based upon the previously pulled updates
(including the recent fix) into the the driver tree.

drivers/base/component.c

@@ -18,6 +18,15 @@
 #include <linux/mutex.h>
 #include <linux/slab.h>
 
+struct component_match {
+	size_t alloc;
+	size_t num;
+	struct {
+		void *data;
+		int (*fn)(struct device *, void *);
+	} compare[0];
+};
+
 struct master {
 	struct list_head node;
 	struct list_head components;
@@ -25,6 +34,7 @@ struct master {
 
 	const struct component_master_ops *ops;
 	struct device *dev;
+	struct component_match *match;
 };
 
 struct component {
@@ -69,6 +79,11 @@ static void component_detach_master(struct master *master, struct component *c)
 	c->master = NULL;
 }
 
+/*
+ * Add a component to a master, finding the component via the compare
+ * function and compare data.  This is safe to call for duplicate matches
+ * and will not result in the same component being added multiple times.
+ */
 int component_master_add_child(struct master *master,
 	int (*compare)(struct device *, void *), void *compare_data)
 {
@@ -76,10 +91,11 @@ int component_master_add_child(struct master *master,
 	int ret = -ENXIO;
 
 	list_for_each_entry(c, &component_list, node) {
-		if (c->master)
+		if (c->master && c->master != master)
 			continue;
 
 		if (compare(c->dev, compare_data)) {
+			if (!c->master)
 				component_attach_master(master, c);
 			ret = 0;
 			break;
@@ -90,6 +106,34 @@ int component_master_add_child(struct master *master,
 }
 EXPORT_SYMBOL_GPL(component_master_add_child);
 
+static int find_components(struct master *master)
+{
+	struct component_match *match = master->match;
+	size_t i;
+	int ret = 0;
+
+	if (!match) {
+		/*
+		 * Search the list of components, looking for components that
+		 * belong to this master, and attach them to the master.
+		 */
+		return master->ops->add_components(master->dev, master);
+	}
+
+	/*
+	 * Scan the array of match functions and attach
+	 * any components which are found to this master.
+	 */
+	for (i = 0; i < match->num; i++) {
+		ret = component_master_add_child(master,
+						 match->compare[i].fn,
+						 match->compare[i].data);
+		if (ret)
+			break;
+	}
+	return ret;
+}
+
 /* Detach all attached components from this master */
 static void master_remove_components(struct master *master)
 {
@@ -113,22 +157,22 @@ static void master_remove_components(struct master *master)
 static int try_to_bring_up_master(struct master *master,
 	struct component *component)
 {
-	int ret = 0;
+	int ret;
+
+	if (master->bound)
+		return 0;
 
-	if (!master->bound) {
 	/*
 	 * Search the list of components, looking for components that
 	 * belong to this master, and attach them to the master.
 	 */
-		if (master->ops->add_components(master->dev, master)) {
+	if (find_components(master)) {
 		/* Failed to find all components */
-			master_remove_components(master);
 		ret = 0;
 		goto out;
 	}
 
 	if (component && component->master != master) {
-			master_remove_components(master);
 		ret = 0;
 		goto out;
 	}
@@ -143,14 +187,14 @@ static int try_to_bring_up_master(struct master *master,
 	if (ret < 0) {
 		devres_release_group(master->dev, NULL);
 		dev_info(master->dev, "master bind failed: %d\n", ret);
-			master_remove_components(master);
 		goto out;
 	}
 
 	master->bound = true;
-		ret = 1;
-	}
+	return 1;
+
 out:
+	master_remove_components(master);
 
 	return ret;
 }
@@ -180,18 +224,89 @@ static void take_down_master(struct master *master)
 	master_remove_components(master);
 }
 
-int component_master_add(struct device *dev,
-	const struct component_master_ops *ops)
+static size_t component_match_size(size_t num)
+{
+	return offsetof(struct component_match, compare[num]);
+}
+
+static struct component_match *component_match_realloc(struct device *dev,
+	struct component_match *match, size_t num)
+{
+	struct component_match *new;
+
+	if (match && match->alloc == num)
+		return match;
+
+	new = devm_kmalloc(dev, component_match_size(num), GFP_KERNEL);
+	if (!new)
+		return ERR_PTR(-ENOMEM);
+
+	if (match) {
+		memcpy(new, match, component_match_size(min(match->num, num)));
+		devm_kfree(dev, match);
+	} else {
+		new->num = 0;
+	}
+
+	new->alloc = num;
+
+	return new;
+}
+
+/*
+ * Add a component to be matched.
+ *
+ * The match array is first created or extended if necessary.
+ */
+void component_match_add(struct device *dev, struct component_match **matchptr,
+	int (*compare)(struct device *, void *), void *compare_data)
+{
+	struct component_match *match = *matchptr;
+
+	if (IS_ERR(match))
+		return;
+
+	if (!match || match->num == match->alloc) {
+		size_t new_size = match ? match->alloc + 16 : 15;
+
+		match = component_match_realloc(dev, match, new_size);
+
+		*matchptr = match;
+
+		if (IS_ERR(match))
+			return;
+	}
+
+	match->compare[match->num].fn = compare;
+	match->compare[match->num].data = compare_data;
+	match->num++;
+}
+EXPORT_SYMBOL(component_match_add);
+
+int component_master_add_with_match(struct device *dev,
+	const struct component_master_ops *ops,
+	struct component_match *match)
 {
 	struct master *master;
 	int ret;
 
+	if (ops->add_components && match)
+		return -EINVAL;
+
+	if (match) {
+		/* Reallocate the match array for its true size */
+		match = component_match_realloc(dev, match, match->num);
+		if (IS_ERR(match))
+			return PTR_ERR(match);
+	}
+
 	master = kzalloc(sizeof(*master), GFP_KERNEL);
 	if (!master)
 		return -ENOMEM;
 
 	master->dev = dev;
 	master->ops = ops;
+	master->match = match;
 	INIT_LIST_HEAD(&master->components);
 
 	/* Add to the list of available masters. */
@@ -209,6 +324,13 @@ int component_master_add(struct device *dev,
 
 	return ret < 0 ? ret : 0;
 }
+EXPORT_SYMBOL_GPL(component_master_add_with_match);
+
+int component_master_add(struct device *dev,
+	const struct component_master_ops *ops)
+{
+	return component_master_add_with_match(dev, ops, NULL);
+}
 EXPORT_SYMBOL_GPL(component_master_add);
 
 void component_master_del(struct device *dev,

drivers/staging/imx-drm/imx-drm-core.c

@@ -570,22 +570,6 @@ static int compare_of(struct device *dev, void *data)
 	return dev->of_node == np;
 }
 
-static LIST_HEAD(imx_drm_components);
-
-static int imx_drm_add_components(struct device *master, struct master *m)
-{
-	struct imx_drm_component *component;
-	int ret;
-
-	list_for_each_entry(component, &imx_drm_components, list) {
-		ret = component_master_add_child(m, compare_of,
-						 component->of_node);
-		if (ret)
-			return ret;
-	}
-	return 0;
-}
-
 static int imx_drm_bind(struct device *dev)
 {
 	return drm_platform_init(&imx_drm_driver, to_platform_device(dev));
@@ -597,43 +581,14 @@ static void imx_drm_unbind(struct device *dev)
 }
 
 static const struct component_master_ops imx_drm_ops = {
-	.add_components = imx_drm_add_components,
 	.bind = imx_drm_bind,
 	.unbind = imx_drm_unbind,
 };
 
-static struct imx_drm_component *imx_drm_find_component(struct device *dev,
-		struct device_node *node)
-{
-	struct imx_drm_component *component;
-
-	list_for_each_entry(component, &imx_drm_components, list)
-		if (component->of_node == node)
-			return component;
-
-	return NULL;
-}
-
-static int imx_drm_add_component(struct device *dev, struct device_node *node)
-{
-	struct imx_drm_component *component;
-
-	if (imx_drm_find_component(dev, node))
-		return 0;
-
-	component = devm_kzalloc(dev, sizeof(*component), GFP_KERNEL);
-	if (!component)
-		return -ENOMEM;
-
-	component->of_node = node;
-	list_add_tail(&component->list, &imx_drm_components);
-
-	return 0;
-}
-
 static int imx_drm_platform_probe(struct platform_device *pdev)
 {
 	struct device_node *ep, *port, *remote;
+	struct component_match *match = NULL;
 	int ret;
 	int i;
 
@@ -647,9 +602,7 @@ static int imx_drm_platform_probe(struct platform_device *pdev)
 		if (!port)
 			break;
 
-		ret = imx_drm_add_component(&pdev->dev, port);
-		if (ret < 0)
-			return ret;
+		component_match_add(&pdev->dev, &match, compare_of, port);
 	}
 
 	if (i == 0) {
@@ -675,10 +628,8 @@ static int imx_drm_platform_probe(struct platform_device *pdev)
 				continue;
 			}
 
-			ret = imx_drm_add_component(&pdev->dev, remote);
+			component_match_add(&pdev->dev, &match, compare_of, remote);
 			of_node_put(remote);
-			if (ret < 0)
-				return ret;
 		}
 		of_node_put(port);
 	}
@@ -687,7 +638,7 @@ static int imx_drm_platform_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	return component_master_add(&pdev->dev, &imx_drm_ops);
+	return component_master_add_with_match(&pdev->dev, &imx_drm_ops, match);
 }
 
 static int imx_drm_platform_remove(struct platform_device *pdev)

include/linux/component.h

@@ -29,4 +29,11 @@ void component_master_del(struct device *,
 int component_master_add_child(struct master *master,
 	int (*compare)(struct device *, void *), void *compare_data);
 
+struct component_match;
+
+int component_master_add_with_match(struct device *,
+	const struct component_master_ops *, struct component_match *);
+void component_match_add(struct device *, struct component_match **,
+	int (*compare)(struct device *, void *), void *compare_data);
+
 #endif