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path: root/drivers/gpu/drm/drm_of.c
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Diffstat (limited to 'drivers/gpu/drm/drm_of.c')
-rw-r--r--drivers/gpu/drm/drm_of.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index be3884073ea4..493c05c9ce4f 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -1,3 +1,4 @@
+#include <linux/component.h>
#include <linux/export.h>
#include <linux/list.h>
#include <linux/of_graph.h>
@@ -61,3 +62,90 @@ uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
return possible_crtcs;
}
EXPORT_SYMBOL(drm_of_find_possible_crtcs);
+
+/**
+ * drm_of_component_probe - Generic probe function for a component based master
+ * @dev: master device containing the OF node
+ * @compare_of: compare function used for matching components
+ * @master_ops: component master ops to be used
+ *
+ * Parse the platform device OF node and bind all the components associated
+ * with the master. Interface ports are added before the encoders in order to
+ * satisfy their .bind requirements
+ * See Documentation/devicetree/bindings/graph.txt for the bindings.
+ *
+ * Returns zero if successful, or one of the standard error codes if it fails.
+ */
+int drm_of_component_probe(struct device *dev,
+ int (*compare_of)(struct device *, void *),
+ const struct component_master_ops *m_ops)
+{
+ struct device_node *ep, *port, *remote;
+ struct component_match *match = NULL;
+ int i;
+
+ if (!dev->of_node)
+ return -EINVAL;
+
+ /*
+ * Bind the crtc's ports first, so that drm_of_find_possible_crtcs()
+ * called from encoder's .bind callbacks works as expected
+ */
+ for (i = 0; ; i++) {
+ port = of_parse_phandle(dev->of_node, "ports", i);
+ if (!port)
+ break;
+
+ if (!of_device_is_available(port->parent)) {
+ of_node_put(port);
+ continue;
+ }
+
+ component_match_add(dev, &match, compare_of, port);
+ of_node_put(port);
+ }
+
+ if (i == 0) {
+ dev_err(dev, "missing 'ports' property\n");
+ return -ENODEV;
+ }
+
+ if (!match) {
+ dev_err(dev, "no available port\n");
+ return -ENODEV;
+ }
+
+ /*
+ * For bound crtcs, bind the encoders attached to their remote endpoint
+ */
+ for (i = 0; ; i++) {
+ port = of_parse_phandle(dev->of_node, "ports", i);
+ if (!port)
+ break;
+
+ if (!of_device_is_available(port->parent)) {
+ of_node_put(port);
+ continue;
+ }
+
+ for_each_child_of_node(port, ep) {
+ remote = of_graph_get_remote_port_parent(ep);
+ if (!remote || !of_device_is_available(remote)) {
+ of_node_put(remote);
+ continue;
+ } else if (!of_device_is_available(remote->parent)) {
+ dev_warn(dev, "parent device of %s is not available\n",
+ remote->full_name);
+ of_node_put(remote);
+ continue;
+ }
+
+ component_match_add(dev, &match, compare_of, remote);
+ of_node_put(remote);
+ }
+ of_node_put(port);
+ }
+
+ return component_master_add_with_match(dev, m_ops, match);
+}
+EXPORT_SYMBOL(drm_of_component_probe);