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