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
 10struct component_master_ops;
 11struct component_match;
 12struct device;
 13struct drm_device;
 14struct drm_encoder;
 15struct drm_panel;
 16struct drm_bridge;
 17struct 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 */
 26enum 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
 32uint32_t drm_of_crtc_port_mask(struct drm_device *dev,
 33			    struct device_node *port);
 34uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
 35				    struct device_node *port);
 36void drm_of_component_match_add(struct device *master,
 37				struct component_match **matchptr,
 38				int (*compare)(struct device *, void *),
 39				struct device_node *node);
 40int drm_of_component_probe(struct device *dev,
 41			   int (*compare_of)(struct device *, void *),
 42			   const struct component_master_ops *m_ops);
 43int drm_of_encoder_active_endpoint(struct device_node *node,
 44				   struct drm_encoder *encoder,
 45				   struct of_endpoint *endpoint);
 46int 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);
 50int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1,
 51					  const struct device_node *port2);
 52#else
 53static inline uint32_t drm_of_crtc_port_mask(struct drm_device *dev,
 54					  struct device_node *port)
 55{
 56	return 0;
 57}
 58
 59static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
 60						  struct device_node *port)
 61{
 62	return 0;
 63}
 64
 65static inline void
 66drm_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
 73static inline int
 74drm_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
 81static 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}
 87static 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
 95static inline int
 96drm_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 */
111static 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
131static 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
141static 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__ */