2 * V4L2 fwnode binding parsing library
4 * Copyright (c) 2016 Intel Corporation.
5 * Author: Sakari Ailus <sakari.ailus@linux.intel.com>
7 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
8 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
10 * Copyright (C) 2012 Renesas Electronics Corp.
11 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of version 2 of the GNU General Public License as
15 * published by the Free Software Foundation.
17 #ifndef _V4L2_FWNODE_H
18 #define _V4L2_FWNODE_H
20 #include <linux/errno.h>
21 #include <linux/fwnode.h>
22 #include <linux/list.h>
23 #include <linux/types.h>
25 #include <media/v4l2-mediabus.h>
26 #include <media/v4l2-subdev.h>
29 struct v4l2_async_notifier;
30 struct v4l2_async_subdev;
32 #define V4L2_FWNODE_CSI2_MAX_DATA_LANES 4
35 * struct v4l2_fwnode_bus_mipi_csi2 - MIPI CSI-2 bus data structure
36 * @flags: media bus (V4L2_MBUS_*) flags
37 * @data_lanes: an array of physical data lane indexes
38 * @clock_lane: physical lane index of the clock lane
39 * @num_data_lanes: number of data lanes
40 * @lane_polarities: polarity of the lanes. The order is the same of
43 struct v4l2_fwnode_bus_mipi_csi2 {
45 unsigned char data_lanes[V4L2_FWNODE_CSI2_MAX_DATA_LANES];
46 unsigned char clock_lane;
47 unsigned short num_data_lanes;
48 bool lane_polarities[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES];
52 * struct v4l2_fwnode_bus_parallel - parallel data bus data structure
53 * @flags: media bus (V4L2_MBUS_*) flags
54 * @bus_width: bus width in bits
55 * @data_shift: data shift in bits
57 struct v4l2_fwnode_bus_parallel {
59 unsigned char bus_width;
60 unsigned char data_shift;
64 * struct v4l2_fwnode_bus_mipi_csi1 - CSI-1/CCP2 data bus structure
65 * @clock_inv: polarity of clock/strobe signal
66 * false - not inverted, true - inverted
67 * @strobe: false - data/clock, true - data/strobe
68 * @lane_polarity: the polarities of the clock (index 0) and data lanes
70 * @data_lane: the number of the data lane
71 * @clock_lane: the number of the clock lane
73 struct v4l2_fwnode_bus_mipi_csi1 {
76 bool lane_polarity[2];
77 unsigned char data_lane;
78 unsigned char clock_lane;
82 * struct v4l2_fwnode_endpoint - the endpoint data structure
83 * @base: fwnode endpoint of the v4l2_fwnode
85 * @bus: union with bus configuration data structure
86 * @bus.parallel: embedded &struct v4l2_fwnode_bus_parallel.
87 * Used if the bus is parallel.
88 * @bus.mipi_csi1: embedded &struct v4l2_fwnode_bus_mipi_csi1.
89 * Used if the bus is MIPI Alliance's Camera Serial
90 * Interface version 1 (MIPI CSI1) or Standard
91 * Mobile Imaging Architecture's Compact Camera Port 2
93 * @bus.mipi_csi2: embedded &struct v4l2_fwnode_bus_mipi_csi2.
94 * Used if the bus is MIPI Alliance's Camera Serial
95 * Interface version 2 (MIPI CSI2).
96 * @link_frequencies: array of supported link frequencies
97 * @nr_of_link_frequencies: number of elements in link_frequenccies array
99 struct v4l2_fwnode_endpoint {
100 struct fwnode_endpoint base;
102 * Fields below this line will be zeroed by
103 * v4l2_fwnode_endpoint_parse()
105 enum v4l2_mbus_type bus_type;
107 struct v4l2_fwnode_bus_parallel parallel;
108 struct v4l2_fwnode_bus_mipi_csi1 mipi_csi1;
109 struct v4l2_fwnode_bus_mipi_csi2 mipi_csi2;
111 u64 *link_frequencies;
112 unsigned int nr_of_link_frequencies;
116 * struct v4l2_fwnode_link - a link between two endpoints
117 * @local_node: pointer to device_node of this endpoint
118 * @local_port: identifier of the port this endpoint belongs to
119 * @remote_node: pointer to device_node of the remote endpoint
120 * @remote_port: identifier of the port the remote endpoint belongs to
122 struct v4l2_fwnode_link {
123 struct fwnode_handle *local_node;
124 unsigned int local_port;
125 struct fwnode_handle *remote_node;
126 unsigned int remote_port;
130 * v4l2_fwnode_endpoint_parse() - parse all fwnode node properties
131 * @fwnode: pointer to the endpoint's fwnode handle
132 * @vep: pointer to the V4L2 fwnode data structure
134 * All properties are optional. If none are found, we don't set any flags. This
135 * means the port has a static configuration and no properties have to be
136 * specified explicitly. If any properties that identify the bus as parallel
137 * are found and slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if
138 * we recognise the bus as serial CSI-2 and clock-noncontinuous isn't set, we
139 * set the V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag. The caller should hold a
140 * reference to @fwnode.
142 * NOTE: This function does not parse properties the size of which is variable
143 * without a low fixed limit. Please use v4l2_fwnode_endpoint_alloc_parse() in
144 * new drivers instead.
146 * Return: 0 on success or a negative error code on failure.
148 int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode,
149 struct v4l2_fwnode_endpoint *vep);
152 * v4l2_fwnode_endpoint_free() - free the V4L2 fwnode acquired by
153 * v4l2_fwnode_endpoint_alloc_parse()
154 * @vep: the V4L2 fwnode the resources of which are to be released
156 * It is safe to call this function with NULL argument or on a V4L2 fwnode the
157 * parsing of which failed.
159 void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep);
162 * v4l2_fwnode_endpoint_alloc_parse() - parse all fwnode node properties
163 * @fwnode: pointer to the endpoint's fwnode handle
165 * All properties are optional. If none are found, we don't set any flags. This
166 * means the port has a static configuration and no properties have to be
167 * specified explicitly. If any properties that identify the bus as parallel
168 * are found and slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if
169 * we recognise the bus as serial CSI-2 and clock-noncontinuous isn't set, we
170 * set the V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag. The caller should hold a
171 * reference to @fwnode.
173 * v4l2_fwnode_endpoint_alloc_parse() has two important differences to
174 * v4l2_fwnode_endpoint_parse():
176 * 1. It also parses variable size data.
178 * 2. The memory it has allocated to store the variable size data must be freed
179 * using v4l2_fwnode_endpoint_free() when no longer needed.
181 * Return: Pointer to v4l2_fwnode_endpoint if successful, on an error pointer
184 struct v4l2_fwnode_endpoint *v4l2_fwnode_endpoint_alloc_parse(
185 struct fwnode_handle *fwnode);
188 * v4l2_fwnode_parse_link() - parse a link between two endpoints
189 * @fwnode: pointer to the endpoint's fwnode at the local end of the link
190 * @link: pointer to the V4L2 fwnode link data structure
192 * Fill the link structure with the local and remote nodes and port numbers.
193 * The local_node and remote_node fields are set to point to the local and
194 * remote port's parent nodes respectively (the port parent node being the
195 * parent node of the port node if that node isn't a 'ports' node, or the
196 * grand-parent node of the port node otherwise).
198 * A reference is taken to both the local and remote nodes, the caller must use
199 * v4l2_fwnode_put_link() to drop the references when done with the
202 * Return: 0 on success, or -ENOLINK if the remote endpoint fwnode can't be
205 int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
206 struct v4l2_fwnode_link *link);
209 * v4l2_fwnode_put_link() - drop references to nodes in a link
210 * @link: pointer to the V4L2 fwnode link data structure
212 * Drop references to the local and remote nodes in the link. This function
213 * must be called on every link parsed with v4l2_fwnode_parse_link().
215 void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link);
219 * typedef parse_endpoint_func - Driver's callback function to be called on
220 * each V4L2 fwnode endpoint.
222 * @dev: pointer to &struct device
223 * @vep: pointer to &struct v4l2_fwnode_endpoint
224 * @asd: pointer to &struct v4l2_async_subdev
228 * * %-ENOTCONN if the endpoint is to be skipped but this
229 * should not be considered as an error
230 * * %-EINVAL if the endpoint configuration is invalid
232 typedef int (*parse_endpoint_func)(struct device *dev,
233 struct v4l2_fwnode_endpoint *vep,
234 struct v4l2_async_subdev *asd);
238 * v4l2_async_notifier_parse_fwnode_endpoints - Parse V4L2 fwnode endpoints in a
240 * @dev: the device the endpoints of which are to be parsed
241 * @notifier: notifier for @dev
242 * @asd_struct_size: size of the driver's async sub-device struct, including
243 * sizeof(struct v4l2_async_subdev). The &struct
244 * v4l2_async_subdev shall be the first member of
245 * the driver's async sub-device struct, i.e. both
246 * begin at the same memory address.
247 * @parse_endpoint: Driver's callback function called on each V4L2 fwnode
248 * endpoint. Optional.
250 * Parse the fwnode endpoints of the @dev device and populate the async sub-
251 * devices list in the notifier. The @parse_endpoint callback function is
252 * called for each endpoint with the corresponding async sub-device pointer to
253 * let the caller initialize the driver-specific part of the async sub-device
256 * The notifier memory shall be zeroed before this function is called on the
259 * This function may not be called on a registered notifier and may be called on
260 * a notifier only once.
262 * The &struct v4l2_fwnode_endpoint passed to the callback function
263 * @parse_endpoint is released once the function is finished. If there is a need
264 * to retain that configuration, the user needs to allocate memory for it.
266 * Any notifier populated using this function must be released with a call to
267 * v4l2_async_notifier_cleanup() after it has been unregistered and the async
268 * sub-devices are no longer in use, even if the function returned an error.
270 * Return: %0 on success, including when no async sub-devices are found
271 * %-ENOMEM if memory allocation failed
272 * %-EINVAL if graph or endpoint parsing failed
273 * Other error codes as returned by @parse_endpoint
275 int v4l2_async_notifier_parse_fwnode_endpoints(
276 struct device *dev, struct v4l2_async_notifier *notifier,
277 size_t asd_struct_size,
278 parse_endpoint_func parse_endpoint);
281 * v4l2_async_notifier_parse_fwnode_endpoints_by_port - Parse V4L2 fwnode
282 * endpoints of a port in a
284 * @dev: the device the endpoints of which are to be parsed
285 * @notifier: notifier for @dev
286 * @asd_struct_size: size of the driver's async sub-device struct, including
287 * sizeof(struct v4l2_async_subdev). The &struct
288 * v4l2_async_subdev shall be the first member of
289 * the driver's async sub-device struct, i.e. both
290 * begin at the same memory address.
291 * @port: port number where endpoints are to be parsed
292 * @parse_endpoint: Driver's callback function called on each V4L2 fwnode
293 * endpoint. Optional.
295 * This function is just like v4l2_async_notifier_parse_fwnode_endpoints() with
296 * the exception that it only parses endpoints in a given port. This is useful
297 * on devices that have both sinks and sources: the async sub-devices connected
298 * to sources have already been configured by another driver (on capture
299 * devices). In this case the driver must know which ports to parse.
301 * Parse the fwnode endpoints of the @dev device on a given @port and populate
302 * the async sub-devices list of the notifier. The @parse_endpoint callback
303 * function is called for each endpoint with the corresponding async sub-device
304 * pointer to let the caller initialize the driver-specific part of the async
305 * sub-device structure.
307 * The notifier memory shall be zeroed before this function is called on the
308 * notifier the first time.
310 * This function may not be called on a registered notifier and may be called on
311 * a notifier only once per port.
313 * The &struct v4l2_fwnode_endpoint passed to the callback function
314 * @parse_endpoint is released once the function is finished. If there is a need
315 * to retain that configuration, the user needs to allocate memory for it.
317 * Any notifier populated using this function must be released with a call to
318 * v4l2_async_notifier_cleanup() after it has been unregistered and the async
319 * sub-devices are no longer in use, even if the function returned an error.
321 * Return: %0 on success, including when no async sub-devices are found
322 * %-ENOMEM if memory allocation failed
323 * %-EINVAL if graph or endpoint parsing failed
324 * Other error codes as returned by @parse_endpoint
326 int v4l2_async_notifier_parse_fwnode_endpoints_by_port(
327 struct device *dev, struct v4l2_async_notifier *notifier,
328 size_t asd_struct_size, unsigned int port,
329 parse_endpoint_func parse_endpoint);
332 * v4l2_fwnode_reference_parse_sensor_common - parse common references on
333 * sensors for async sub-devices
334 * @dev: the device node the properties of which are parsed for references
335 * @notifier: the async notifier where the async subdevs will be added
337 * Parse common sensor properties for remote devices related to the
338 * sensor and set up async sub-devices for them.
340 * Any notifier populated using this function must be released with a call to
341 * v4l2_async_notifier_release() after it has been unregistered and the async
342 * sub-devices are no longer in use, even in the case the function returned an
345 * Return: 0 on success
346 * -ENOMEM if memory allocation failed
347 * -EINVAL if property parsing failed
349 int v4l2_async_notifier_parse_fwnode_sensor_common(
350 struct device *dev, struct v4l2_async_notifier *notifier);
353 * v4l2_async_register_fwnode_subdev - registers a sub-device to the
354 * asynchronous sub-device framework
355 * and parses fwnode endpoints
357 * @sd: pointer to struct &v4l2_subdev
358 * @asd_struct_size: size of the driver's async sub-device struct, including
359 * sizeof(struct v4l2_async_subdev). The &struct
360 * v4l2_async_subdev shall be the first member of
361 * the driver's async sub-device struct, i.e. both
362 * begin at the same memory address.
363 * @ports: array of port id's to parse for fwnode endpoints. If NULL, will
364 * parse all ports owned by the sub-device.
365 * @num_ports: number of ports in @ports array. Ignored if @ports is NULL.
366 * @parse_endpoint: Driver's callback function called on each V4L2 fwnode
367 * endpoint. Optional.
369 * This function is just like v4l2_async_register_subdev() with the
370 * exception that calling it will also allocate a notifier for the
371 * sub-device, parse the sub-device's firmware node endpoints using
372 * v4l2_async_notifier_parse_fwnode_endpoints() or
373 * v4l2_async_notifier_parse_fwnode_endpoints_by_port(), and
374 * registers the sub-device notifier. The sub-device is similarly
375 * unregistered by calling v4l2_async_unregister_subdev().
377 * While registered, the subdev module is marked as in-use.
379 * An error is returned if the module is no longer loaded on any attempts
382 int v4l2_async_register_fwnode_subdev(
383 struct v4l2_subdev *sd, size_t asd_struct_size,
384 unsigned int *ports, unsigned int num_ports,
385 int (*parse_endpoint)(struct device *dev,
386 struct v4l2_fwnode_endpoint *vep,
387 struct v4l2_async_subdev *asd));
389 #endif /* _V4L2_FWNODE_H */