1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __DRM_OF_H__
3 #define __DRM_OF_H__
4 
5 #include <linux/of_graph.h>
6 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_PANEL_BRIDGE)
7 #include <drm/drm_bridge.h>
8 #endif
9 
10 struct component_master_ops;
11 struct component_match;
12 struct device;
13 struct drm_device;
14 struct drm_encoder;
15 struct drm_panel;
16 struct drm_bridge;
17 struct device_node;
18 
19 /**
20  * enum drm_lvds_dual_link_pixels - Pixel order of an LVDS dual-link connection
21  * @DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS: Even pixels are expected to be generated
22  *    from the first port, odd pixels from the second port
23  * @DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS: Odd pixels are expected to be generated
24  *    from the first port, even pixels from the second port
25  */
26 enum drm_lvds_dual_link_pixels {
27 	DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS = 0,
28 	DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS = 1,
29 };
30 
31 #ifdef CONFIG_OF
32 uint32_t drm_of_crtc_port_mask(struct drm_device *dev,
33 			    struct device_node *port);
34 uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
35 				    struct device_node *port);
36 void drm_of_component_match_add(struct device *master,
37 				struct component_match **matchptr,
38 				int (*compare)(struct device *, void *),
39 				struct device_node *node);
40 int drm_of_component_probe(struct device *dev,
41 			   int (*compare_of)(struct device *, void *),
42 			   const struct component_master_ops *m_ops);
43 int drm_of_encoder_active_endpoint(struct device_node *node,
44 				   struct drm_encoder *encoder,
45 				   struct of_endpoint *endpoint);
46 int drm_of_find_panel_or_bridge(const struct device_node *np,
47 				int port, int endpoint,
48 				struct drm_panel **panel,
49 				struct drm_bridge **bridge);
50 int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1,
51 					  const struct device_node *port2);
52 #else
drm_of_crtc_port_mask(struct drm_device * dev,struct device_node * port)53 static inline uint32_t drm_of_crtc_port_mask(struct drm_device *dev,
54 					  struct device_node *port)
55 {
56 	return 0;
57 }
58 
drm_of_find_possible_crtcs(struct drm_device * dev,struct device_node * port)59 static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
60 						  struct device_node *port)
61 {
62 	return 0;
63 }
64 
65 static inline void
drm_of_component_match_add(struct device * master,struct component_match ** matchptr,int (* compare)(struct device *,void *),struct device_node * node)66 drm_of_component_match_add(struct device *master,
67 			   struct component_match **matchptr,
68 			   int (*compare)(struct device *, void *),
69 			   struct device_node *node)
70 {
71 }
72 
73 static inline int
drm_of_component_probe(struct device * dev,int (* compare_of)(struct device *,void *),const struct component_master_ops * m_ops)74 drm_of_component_probe(struct device *dev,
75 		       int (*compare_of)(struct device *, void *),
76 		       const struct component_master_ops *m_ops)
77 {
78 	return -EINVAL;
79 }
80 
drm_of_encoder_active_endpoint(struct device_node * node,struct drm_encoder * encoder,struct of_endpoint * endpoint)81 static inline int drm_of_encoder_active_endpoint(struct device_node *node,
82 						 struct drm_encoder *encoder,
83 						 struct of_endpoint *endpoint)
84 {
85 	return -EINVAL;
86 }
drm_of_find_panel_or_bridge(const struct device_node * np,int port,int endpoint,struct drm_panel ** panel,struct drm_bridge ** bridge)87 static inline int drm_of_find_panel_or_bridge(const struct device_node *np,
88 					      int port, int endpoint,
89 					      struct drm_panel **panel,
90 					      struct drm_bridge **bridge)
91 {
92 	return -EINVAL;
93 }
94 
95 static inline int
drm_of_lvds_get_dual_link_pixel_order(const struct device_node * port1,const struct device_node * port2)96 drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1,
97 				      const struct device_node *port2)
98 {
99 	return -EINVAL;
100 }
101 #endif
102 
103 /*
104  * drm_of_panel_bridge_remove - remove panel bridge
105  * @np: device tree node containing panel bridge output ports
106  *
107  * Remove the panel bridge of a given DT node's port and endpoint number
108  *
109  * Returns zero if successful, or one of the standard error codes if it fails.
110  */
drm_of_panel_bridge_remove(const struct device_node * np,int port,int endpoint)111 static inline int drm_of_panel_bridge_remove(const struct device_node *np,
112 					     int port, int endpoint)
113 {
114 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_PANEL_BRIDGE)
115 	struct drm_bridge *bridge;
116 	struct device_node *remote;
117 
118 	remote = of_graph_get_remote_node(np, port, endpoint);
119 	if (!remote)
120 		return -ENODEV;
121 
122 	bridge = of_drm_find_bridge(remote);
123 	drm_panel_bridge_remove(bridge);
124 
125 	return 0;
126 #else
127 	return -EINVAL;
128 #endif
129 }
130 
drm_of_encoder_active_endpoint_id(struct device_node * node,struct drm_encoder * encoder)131 static inline int drm_of_encoder_active_endpoint_id(struct device_node *node,
132 						    struct drm_encoder *encoder)
133 {
134 	struct of_endpoint endpoint;
135 	int ret = drm_of_encoder_active_endpoint(node, encoder,
136 						 &endpoint);
137 
138 	return ret ?: endpoint.id;
139 }
140 
drm_of_encoder_active_port_id(struct device_node * node,struct drm_encoder * encoder)141 static inline int drm_of_encoder_active_port_id(struct device_node *node,
142 						struct drm_encoder *encoder)
143 {
144 	struct of_endpoint endpoint;
145 	int ret = drm_of_encoder_active_endpoint(node, encoder,
146 						 &endpoint);
147 
148 	return ret ?: endpoint.port;
149 }
150 
151 #endif /* __DRM_OF_H__ */
152