include/drm/drm_of.h

   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
  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
  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
  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
  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
  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 }
  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
  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  */
 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
 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
 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__ */