1 #include <linux/component.h>
2 #include <linux/export.h>
3 #include <linux/list.h>
4 #include <linux/of_graph.h>
6 #include <drm/drm_crtc.h>
7 #include <drm/drm_of.h>
9 static void drm_release_of(struct device *dev, void *data)
15 * drm_crtc_port_mask - find the mask of a registered CRTC by port OF node
19 * Given a port OF node, return the possible mask of the corresponding
20 * CRTC within a device's list of CRTCs. Returns zero if not found.
22 static uint32_t drm_crtc_port_mask(struct drm_device *dev,
23 struct device_node *port)
25 unsigned int index = 0;
28 drm_for_each_crtc(tmp, dev) {
29 if (tmp->port == port)
39 * drm_of_find_possible_crtcs - find the possible CRTCs for an encoder port
41 * @port: encoder port to scan for endpoints
43 * Scan all endpoints attached to a port, locate their attached CRTCs,
44 * and generate the DRM mask of CRTCs which may be attached to this
47 * See Documentation/devicetree/bindings/graph.txt for the bindings.
49 uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
50 struct device_node *port)
52 struct device_node *remote_port, *ep;
53 uint32_t possible_crtcs = 0;
55 for_each_endpoint_of_node(port, ep) {
56 remote_port = of_graph_get_remote_port(ep);
62 possible_crtcs |= drm_crtc_port_mask(dev, remote_port);
64 of_node_put(remote_port);
67 return possible_crtcs;
69 EXPORT_SYMBOL(drm_of_find_possible_crtcs);
72 * drm_of_component_match_add - Add a component helper OF node match rule
73 * @master: master device
74 * @matchptr: component match pointer
75 * @compare: compare function used for matching component
78 void drm_of_component_match_add(struct device *master,
79 struct component_match **matchptr,
80 int (*compare)(struct device *, void *),
81 struct device_node *node)
84 component_match_add_release(master, matchptr, drm_release_of,
87 EXPORT_SYMBOL_GPL(drm_of_component_match_add);
90 * drm_of_component_probe - Generic probe function for a component based master
91 * @dev: master device containing the OF node
92 * @compare_of: compare function used for matching components
93 * @master_ops: component master ops to be used
95 * Parse the platform device OF node and bind all the components associated
96 * with the master. Interface ports are added before the encoders in order to
97 * satisfy their .bind requirements
98 * See Documentation/devicetree/bindings/graph.txt for the bindings.
100 * Returns zero if successful, or one of the standard error codes if it fails.
102 int drm_of_component_probe(struct device *dev,
103 int (*compare_of)(struct device *, void *),
104 const struct component_master_ops *m_ops)
106 struct device_node *ep, *port, *remote;
107 struct component_match *match = NULL;
114 * Bind the crtc's ports first, so that drm_of_find_possible_crtcs()
115 * called from encoder's .bind callbacks works as expected
118 port = of_parse_phandle(dev->of_node, "ports", i);
122 if (!of_device_is_available(port->parent)) {
127 drm_of_component_match_add(dev, &match, compare_of, port);
132 dev_err(dev, "missing 'ports' property\n");
137 dev_err(dev, "no available port\n");
142 * For bound crtcs, bind the encoders attached to their remote endpoint
145 port = of_parse_phandle(dev->of_node, "ports", i);
149 if (!of_device_is_available(port->parent)) {
154 for_each_child_of_node(port, ep) {
155 remote = of_graph_get_remote_port_parent(ep);
156 if (!remote || !of_device_is_available(remote)) {
159 } else if (!of_device_is_available(remote->parent)) {
160 dev_warn(dev, "parent device of %s is not available\n",
166 drm_of_component_match_add(dev, &match, compare_of,
173 return component_master_add_with_match(dev, m_ops, match);
175 EXPORT_SYMBOL(drm_of_component_probe);
178 * drm_of_encoder_active_endpoint - return the active encoder endpoint
179 * @node: device tree node containing encoder input ports
180 * @encoder: drm_encoder
182 * Given an encoder device node and a drm_encoder with a connected crtc,
183 * parse the encoder endpoint connecting to the crtc port.
185 int drm_of_encoder_active_endpoint(struct device_node *node,
186 struct drm_encoder *encoder,
187 struct of_endpoint *endpoint)
189 struct device_node *ep;
190 struct drm_crtc *crtc = encoder->crtc;
191 struct device_node *port;
197 for_each_endpoint_of_node(node, ep) {
198 port = of_graph_get_remote_port(ep);
200 if (port == crtc->port) {
201 ret = of_graph_parse_endpoint(ep, endpoint);
209 EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);