1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * V4L2 fwnode binding parsing library
5 * Copyright (c) 2016 Intel Corporation.
6 * Author: Sakari Ailus <sakari.ailus@linux.intel.com>
8 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
9 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
11 * Copyright (C) 2012 Renesas Electronics Corp.
12 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
14 #ifndef _V4L2_FWNODE_H
15 #define _V4L2_FWNODE_H
17 #include <linux/errno.h>
18 #include <linux/fwnode.h>
19 #include <linux/list.h>
20 #include <linux/types.h>
22 #include <media/v4l2-mediabus.h>
25 struct v4l2_async_notifier;
26 struct v4l2_async_subdev;
28 #define V4L2_FWNODE_CSI2_MAX_DATA_LANES 4
31 * struct v4l2_fwnode_bus_mipi_csi2 - MIPI CSI-2 bus data structure
32 * @flags: media bus (V4L2_MBUS_*) flags
33 * @data_lanes: an array of physical data lane indexes
34 * @clock_lane: physical lane index of the clock lane
35 * @num_data_lanes: number of data lanes
36 * @lane_polarities: polarity of the lanes. The order is the same of
39 struct v4l2_fwnode_bus_mipi_csi2 {
41 unsigned char data_lanes[V4L2_FWNODE_CSI2_MAX_DATA_LANES];
42 unsigned char clock_lane;
43 unsigned char num_data_lanes;
44 bool lane_polarities[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES];
48 * struct v4l2_fwnode_bus_parallel - parallel data bus data structure
49 * @flags: media bus (V4L2_MBUS_*) flags
50 * @bus_width: bus width in bits
51 * @data_shift: data shift in bits
53 struct v4l2_fwnode_bus_parallel {
55 unsigned char bus_width;
56 unsigned char data_shift;
60 * struct v4l2_fwnode_bus_mipi_csi1 - CSI-1/CCP2 data bus structure
61 * @clock_inv: polarity of clock/strobe signal
62 * false - not inverted, true - inverted
63 * @strobe: false - data/clock, true - data/strobe
64 * @lane_polarity: the polarities of the clock (index 0) and data lanes
66 * @data_lane: the number of the data lane
67 * @clock_lane: the number of the clock lane
69 struct v4l2_fwnode_bus_mipi_csi1 {
70 unsigned char clock_inv:1;
71 unsigned char strobe:1;
72 bool lane_polarity[2];
73 unsigned char data_lane;
74 unsigned char clock_lane;
78 * struct v4l2_fwnode_endpoint - the endpoint data structure
79 * @base: fwnode endpoint of the v4l2_fwnode
81 * @bus: bus configuration data structure
82 * @bus.parallel: embedded &struct v4l2_fwnode_bus_parallel.
83 * Used if the bus is parallel.
84 * @bus.mipi_csi1: embedded &struct v4l2_fwnode_bus_mipi_csi1.
85 * Used if the bus is MIPI Alliance's Camera Serial
86 * Interface version 1 (MIPI CSI1) or Standard
87 * Mobile Imaging Architecture's Compact Camera Port 2
89 * @bus.mipi_csi2: embedded &struct v4l2_fwnode_bus_mipi_csi2.
90 * Used if the bus is MIPI Alliance's Camera Serial
91 * Interface version 2 (MIPI CSI2).
92 * @link_frequencies: array of supported link frequencies
93 * @nr_of_link_frequencies: number of elements in link_frequenccies array
95 struct v4l2_fwnode_endpoint {
96 struct fwnode_endpoint base;
98 * Fields below this line will be zeroed by
99 * v4l2_fwnode_endpoint_parse()
101 enum v4l2_mbus_type bus_type;
103 struct v4l2_fwnode_bus_parallel parallel;
104 struct v4l2_fwnode_bus_mipi_csi1 mipi_csi1;
105 struct v4l2_fwnode_bus_mipi_csi2 mipi_csi2;
107 u64 *link_frequencies;
108 unsigned int nr_of_link_frequencies;
112 * V4L2_FWNODE_PROPERTY_UNSET - identify a non initialized property
114 * All properties in &struct v4l2_fwnode_device_properties are initialized
117 #define V4L2_FWNODE_PROPERTY_UNSET (-1U)
120 * enum v4l2_fwnode_orientation - possible device orientation
121 * @V4L2_FWNODE_ORIENTATION_FRONT: device installed on the front side
122 * @V4L2_FWNODE_ORIENTATION_BACK: device installed on the back side
123 * @V4L2_FWNODE_ORIENTATION_EXTERNAL: device externally located
125 enum v4l2_fwnode_orientation {
126 V4L2_FWNODE_ORIENTATION_FRONT,
127 V4L2_FWNODE_ORIENTATION_BACK,
128 V4L2_FWNODE_ORIENTATION_EXTERNAL
132 * struct v4l2_fwnode_device_properties - fwnode device properties
133 * @orientation: device orientation. See &enum v4l2_fwnode_orientation
134 * @rotation: device rotation
136 struct v4l2_fwnode_device_properties {
137 enum v4l2_fwnode_orientation orientation;
138 unsigned int rotation;
142 * struct v4l2_fwnode_link - a link between two endpoints
143 * @local_node: pointer to device_node of this endpoint
144 * @local_port: identifier of the port this endpoint belongs to
145 * @local_id: identifier of the id this endpoint belongs to
146 * @remote_node: pointer to device_node of the remote endpoint
147 * @remote_port: identifier of the port the remote endpoint belongs to
148 * @remote_id: identifier of the id the remote endpoint belongs to
150 struct v4l2_fwnode_link {
151 struct fwnode_handle *local_node;
152 unsigned int local_port;
153 unsigned int local_id;
154 struct fwnode_handle *remote_node;
155 unsigned int remote_port;
156 unsigned int remote_id;
160 * enum v4l2_connector_type - connector type
161 * @V4L2_CONN_UNKNOWN: unknown connector type, no V4L2 connector configuration
162 * @V4L2_CONN_COMPOSITE: analog composite connector
163 * @V4L2_CONN_SVIDEO: analog svideo connector
165 enum v4l2_connector_type {
172 * struct v4l2_connector_link - connector link data structure
173 * @head: structure to be used to add the link to the
174 * &struct v4l2_fwnode_connector
175 * @fwnode_link: &struct v4l2_fwnode_link link between the connector and the
176 * device the connector belongs to.
178 struct v4l2_connector_link {
179 struct list_head head;
180 struct v4l2_fwnode_link fwnode_link;
184 * struct v4l2_fwnode_connector_analog - analog connector data structure
185 * @sdtv_stds: sdtv standards this connector supports, set to V4L2_STD_ALL
186 * if no restrictions are specified.
188 struct v4l2_fwnode_connector_analog {
189 v4l2_std_id sdtv_stds;
193 * struct v4l2_fwnode_connector - the connector data structure
194 * @name: the connector device name
195 * @label: optional connector label
196 * @type: connector type
197 * @links: list of all connector &struct v4l2_connector_link links
198 * @nr_of_links: total number of links
199 * @connector: connector configuration
200 * @connector.analog: analog connector configuration
201 * &struct v4l2_fwnode_connector_analog
203 struct v4l2_fwnode_connector {
206 enum v4l2_connector_type type;
207 struct list_head links;
208 unsigned int nr_of_links;
211 struct v4l2_fwnode_connector_analog analog;
212 /* future connectors */
217 * v4l2_fwnode_endpoint_parse() - parse all fwnode node properties
218 * @fwnode: pointer to the endpoint's fwnode handle
219 * @vep: pointer to the V4L2 fwnode data structure
221 * This function parses the V4L2 fwnode endpoint specific parameters from the
222 * firmware. There are two ways to use this function, either by letting it
223 * obtain the type of the bus (by setting the @vep.bus_type field to
224 * V4L2_MBUS_UNKNOWN) or specifying the bus type explicitly to one of the &enum
225 * v4l2_mbus_type types.
227 * When @vep.bus_type is V4L2_MBUS_UNKNOWN, the function will use the "bus-type"
228 * property to determine the type when it is available. The caller is
229 * responsible for validating the contents of @vep.bus_type field after the call
232 * As a deprecated functionality to support older DT bindings without "bus-type"
233 * property for devices that support multiple types, if the "bus-type" property
234 * does not exist, the function will attempt to guess the type based on the
235 * endpoint properties available. NEVER RELY ON GUESSING THE BUS TYPE IN NEW
236 * DRIVERS OR BINDINGS.
238 * It is also possible to set @vep.bus_type corresponding to an actual bus. In
239 * this case the function will only attempt to parse properties related to this
240 * bus, and it will return an error if the value of the "bus-type" property
241 * corresponds to a different bus.
243 * The caller is required to initialise all fields of @vep, either with
244 * explicitly values, or by zeroing them.
246 * The function does not change the V4L2 fwnode endpoint state if it fails.
248 * NOTE: This function does not parse "link-frequencies" property as its size is
249 * not known in advance. Please use v4l2_fwnode_endpoint_alloc_parse() if you
250 * need properties of variable size.
252 * Return: %0 on success or a negative error code on failure:
253 * %-ENOMEM on memory allocation failure
254 * %-EINVAL on parsing failure
255 * %-ENXIO on mismatching bus types
257 int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode,
258 struct v4l2_fwnode_endpoint *vep);
261 * v4l2_fwnode_endpoint_free() - free the V4L2 fwnode acquired by
262 * v4l2_fwnode_endpoint_alloc_parse()
263 * @vep: the V4L2 fwnode the resources of which are to be released
265 * It is safe to call this function with NULL argument or on a V4L2 fwnode the
266 * parsing of which failed.
268 void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep);
271 * v4l2_fwnode_endpoint_alloc_parse() - parse all fwnode node properties
272 * @fwnode: pointer to the endpoint's fwnode handle
273 * @vep: pointer to the V4L2 fwnode data structure
275 * This function parses the V4L2 fwnode endpoint specific parameters from the
276 * firmware. There are two ways to use this function, either by letting it
277 * obtain the type of the bus (by setting the @vep.bus_type field to
278 * V4L2_MBUS_UNKNOWN) or specifying the bus type explicitly to one of the &enum
279 * v4l2_mbus_type types.
281 * When @vep.bus_type is V4L2_MBUS_UNKNOWN, the function will use the "bus-type"
282 * property to determine the type when it is available. The caller is
283 * responsible for validating the contents of @vep.bus_type field after the call
286 * As a deprecated functionality to support older DT bindings without "bus-type"
287 * property for devices that support multiple types, if the "bus-type" property
288 * does not exist, the function will attempt to guess the type based on the
289 * endpoint properties available. NEVER RELY ON GUESSING THE BUS TYPE IN NEW
290 * DRIVERS OR BINDINGS.
292 * It is also possible to set @vep.bus_type corresponding to an actual bus. In
293 * this case the function will only attempt to parse properties related to this
294 * bus, and it will return an error if the value of the "bus-type" property
295 * corresponds to a different bus.
297 * The caller is required to initialise all fields of @vep, either with
298 * explicitly values, or by zeroing them.
300 * The function does not change the V4L2 fwnode endpoint state if it fails.
302 * v4l2_fwnode_endpoint_alloc_parse() has two important differences to
303 * v4l2_fwnode_endpoint_parse():
305 * 1. It also parses variable size data.
307 * 2. The memory it has allocated to store the variable size data must be freed
308 * using v4l2_fwnode_endpoint_free() when no longer needed.
310 * Return: %0 on success or a negative error code on failure:
311 * %-ENOMEM on memory allocation failure
312 * %-EINVAL on parsing failure
313 * %-ENXIO on mismatching bus types
315 int v4l2_fwnode_endpoint_alloc_parse(struct fwnode_handle *fwnode,
316 struct v4l2_fwnode_endpoint *vep);
319 * v4l2_fwnode_parse_link() - parse a link between two endpoints
320 * @fwnode: pointer to the endpoint's fwnode at the local end of the link
321 * @link: pointer to the V4L2 fwnode link data structure
323 * Fill the link structure with the local and remote nodes and port numbers.
324 * The local_node and remote_node fields are set to point to the local and
325 * remote port's parent nodes respectively (the port parent node being the
326 * parent node of the port node if that node isn't a 'ports' node, or the
327 * grand-parent node of the port node otherwise).
329 * A reference is taken to both the local and remote nodes, the caller must use
330 * v4l2_fwnode_put_link() to drop the references when done with the
333 * Return: 0 on success, or -ENOLINK if the remote endpoint fwnode can't be
336 int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
337 struct v4l2_fwnode_link *link);
340 * v4l2_fwnode_put_link() - drop references to nodes in a link
341 * @link: pointer to the V4L2 fwnode link data structure
343 * Drop references to the local and remote nodes in the link. This function
344 * must be called on every link parsed with v4l2_fwnode_parse_link().
346 void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link);
349 * v4l2_fwnode_connector_free() - free the V4L2 connector acquired memory
350 * @connector: the V4L2 connector resources of which are to be released
352 * Free all allocated memory and put all links acquired by
353 * v4l2_fwnode_connector_parse() and v4l2_fwnode_connector_add_link().
355 * It is safe to call this function with NULL argument or on a V4L2 connector
356 * the parsing of which failed.
358 void v4l2_fwnode_connector_free(struct v4l2_fwnode_connector *connector);
361 * v4l2_fwnode_connector_parse() - initialize the 'struct v4l2_fwnode_connector'
362 * @fwnode: pointer to the subdev endpoint's fwnode handle where the connector
363 * is connected to or to the connector endpoint fwnode handle.
364 * @connector: pointer to the V4L2 fwnode connector data structure
366 * Fill the &struct v4l2_fwnode_connector with the connector type, label and
367 * all &enum v4l2_connector_type specific connector data. The label is optional
368 * so it is set to %NULL if no one was found. The function initialize the links
369 * to zero. Adding links to the connector is done by calling
370 * v4l2_fwnode_connector_add_link().
372 * The memory allocated for the label must be freed when no longer needed.
373 * Freeing the memory is done by v4l2_fwnode_connector_free().
376 * * %0 on success or a negative error code on failure:
377 * * %-EINVAL if @fwnode is invalid
378 * * %-ENOTCONN if connector type is unknown or connector device can't be found
380 int v4l2_fwnode_connector_parse(struct fwnode_handle *fwnode,
381 struct v4l2_fwnode_connector *connector);
384 * v4l2_fwnode_connector_add_link - add a link between a connector node and
385 * a v4l2-subdev node.
386 * @fwnode: pointer to the subdev endpoint's fwnode handle where the connector
388 * @connector: pointer to the V4L2 fwnode connector data structure
390 * Add a new &struct v4l2_connector_link link to the
391 * &struct v4l2_fwnode_connector connector links list. The link local_node
392 * points to the connector node, the remote_node to the host v4l2 (sub)dev.
394 * The taken references to remote_node and local_node must be dropped and the
395 * allocated memory must be freed when no longer needed. Both is done by calling
396 * v4l2_fwnode_connector_free().
399 * * %0 on success or a negative error code on failure:
400 * * %-EINVAL if @fwnode or @connector is invalid or @connector type is unknown
401 * * %-ENOMEM on link memory allocation failure
402 * * %-ENOTCONN if remote connector device can't be found
403 * * %-ENOLINK if link parsing between v4l2 (sub)dev and connector fails
405 int v4l2_fwnode_connector_add_link(struct fwnode_handle *fwnode,
406 struct v4l2_fwnode_connector *connector);
409 * v4l2_fwnode_device_parse() - parse fwnode device properties
410 * @dev: pointer to &struct device
411 * @props: pointer to &struct v4l2_fwnode_device_properties where to store the
412 * parsed properties values
414 * This function parses and validates the V4L2 fwnode device properties from the
415 * firmware interface, and fills the @struct v4l2_fwnode_device_properties
416 * provided by the caller.
420 * %-EINVAL if a parsed property value is not valid
422 int v4l2_fwnode_device_parse(struct device *dev,
423 struct v4l2_fwnode_device_properties *props);
426 * typedef parse_endpoint_func - Driver's callback function to be called on
427 * each V4L2 fwnode endpoint.
429 * @dev: pointer to &struct device
430 * @vep: pointer to &struct v4l2_fwnode_endpoint
431 * @asd: pointer to &struct v4l2_async_subdev
435 * * %-ENOTCONN if the endpoint is to be skipped but this
436 * should not be considered as an error
437 * * %-EINVAL if the endpoint configuration is invalid
439 typedef int (*parse_endpoint_func)(struct device *dev,
440 struct v4l2_fwnode_endpoint *vep,
441 struct v4l2_async_subdev *asd);
444 * v4l2_async_notifier_parse_fwnode_endpoints - Parse V4L2 fwnode endpoints in a
446 * @dev: the device the endpoints of which are to be parsed
447 * @notifier: notifier for @dev
448 * @asd_struct_size: size of the driver's async sub-device struct, including
449 * sizeof(struct v4l2_async_subdev). The &struct
450 * v4l2_async_subdev shall be the first member of
451 * the driver's async sub-device struct, i.e. both
452 * begin at the same memory address.
453 * @parse_endpoint: Driver's callback function called on each V4L2 fwnode
454 * endpoint. Optional.
456 * Parse the fwnode endpoints of the @dev device and populate the async sub-
457 * devices list in the notifier. The @parse_endpoint callback function is
458 * called for each endpoint with the corresponding async sub-device pointer to
459 * let the caller initialize the driver-specific part of the async sub-device
462 * The notifier memory shall be zeroed before this function is called on the
465 * This function may not be called on a registered notifier and may be called on
466 * a notifier only once.
468 * The &struct v4l2_fwnode_endpoint passed to the callback function
469 * @parse_endpoint is released once the function is finished. If there is a need
470 * to retain that configuration, the user needs to allocate memory for it.
472 * Any notifier populated using this function must be released with a call to
473 * v4l2_async_notifier_cleanup() after it has been unregistered and the async
474 * sub-devices are no longer in use, even if the function returned an error.
476 * Return: %0 on success, including when no async sub-devices are found
477 * %-ENOMEM if memory allocation failed
478 * %-EINVAL if graph or endpoint parsing failed
479 * Other error codes as returned by @parse_endpoint
482 v4l2_async_notifier_parse_fwnode_endpoints(struct device *dev,
483 struct v4l2_async_notifier *notifier,
484 size_t asd_struct_size,
485 parse_endpoint_func parse_endpoint);
488 * v4l2_async_notifier_parse_fwnode_sensor_common - parse common references on
489 * sensors for async sub-devices
490 * @dev: the device node the properties of which are parsed for references
491 * @notifier: the async notifier where the async subdevs will be added
493 * Parse common sensor properties for remote devices related to the
494 * sensor and set up async sub-devices for them.
496 * Any notifier populated using this function must be released with a call to
497 * v4l2_async_notifier_release() after it has been unregistered and the async
498 * sub-devices are no longer in use, even in the case the function returned an
501 * Return: 0 on success
502 * -ENOMEM if memory allocation failed
503 * -EINVAL if property parsing failed
505 int v4l2_async_notifier_parse_fwnode_sensor_common(struct device *dev,
506 struct v4l2_async_notifier *notifier);
508 /* Helper macros to access the connector links. */
510 /** v4l2_connector_last_link - Helper macro to get the first
511 * &struct v4l2_fwnode_connector link
512 * @v4l2c: &struct v4l2_fwnode_connector owning the connector links
514 * This marco returns the first added &struct v4l2_connector_link connector
515 * link or @NULL if the connector has no links.
517 #define v4l2_connector_first_link(v4l2c) \
518 list_first_entry_or_null(&(v4l2c)->links, \
519 struct v4l2_connector_link, head)
521 /** v4l2_connector_last_link - Helper macro to get the last
522 * &struct v4l2_fwnode_connector link
523 * @v4l2c: &struct v4l2_fwnode_connector owning the connector links
525 * This marco returns the last &struct v4l2_connector_link added connector link.
527 #define v4l2_connector_last_link(v4l2c) \
528 list_last_entry(&(v4l2c)->links, struct v4l2_connector_link, head)
530 #endif /* _V4L2_FWNODE_H */