/* * V4L2 fwnode binding parsing library * * Copyright (c) 2016 Intel Corporation. * Author: Sakari Ailus * * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. * Author: Sylwester Nawrocki * * Copyright (C) 2012 Renesas Electronics Corp. * Author: Guennadi Liakhovetski * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. */ #ifndef _V4L2_FWNODE_H #define _V4L2_FWNODE_H #include #include #include #include #include struct fwnode_handle; struct v4l2_async_notifier; struct v4l2_async_subdev; #define V4L2_FWNODE_CSI2_MAX_DATA_LANES 4 /** * struct v4l2_fwnode_bus_mipi_csi2 - MIPI CSI-2 bus data structure * @flags: media bus (V4L2_MBUS_*) flags * @data_lanes: an array of physical data lane indexes * @clock_lane: physical lane index of the clock lane * @num_data_lanes: number of data lanes * @lane_polarities: polarity of the lanes. The order is the same of * the physical lanes. */ struct v4l2_fwnode_bus_mipi_csi2 { unsigned int flags; unsigned char data_lanes[V4L2_FWNODE_CSI2_MAX_DATA_LANES]; unsigned char clock_lane; unsigned short num_data_lanes; bool lane_polarities[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES]; }; /** * struct v4l2_fwnode_bus_parallel - parallel data bus data structure * @flags: media bus (V4L2_MBUS_*) flags * @bus_width: bus width in bits * @data_shift: data shift in bits */ struct v4l2_fwnode_bus_parallel { unsigned int flags; unsigned char bus_width; unsigned char data_shift; }; /** * struct v4l2_fwnode_bus_mipi_csi1 - CSI-1/CCP2 data bus structure * @clock_inv: polarity of clock/strobe signal * false - not inverted, true - inverted * @strobe: false - data/clock, true - data/strobe * @lane_polarity: the polarities of the clock (index 0) and data lanes * index (1) * @data_lane: the number of the data lane * @clock_lane: the number of the clock lane */ struct v4l2_fwnode_bus_mipi_csi1 { bool clock_inv; bool strobe; bool lane_polarity[2]; unsigned char data_lane; unsigned char clock_lane; }; /** * struct v4l2_fwnode_endpoint - the endpoint data structure * @base: fwnode endpoint of the v4l2_fwnode * @bus_type: bus type * @bus: bus configuration data structure * @link_frequencies: array of supported link frequencies * @nr_of_link_frequencies: number of elements in link_frequenccies array */ struct v4l2_fwnode_endpoint { struct fwnode_endpoint base; /* * Fields below this line will be zeroed by * v4l2_fwnode_parse_endpoint() */ enum v4l2_mbus_type bus_type; union { struct v4l2_fwnode_bus_parallel parallel; struct v4l2_fwnode_bus_mipi_csi1 mipi_csi1; struct v4l2_fwnode_bus_mipi_csi2 mipi_csi2; } bus; u64 *link_frequencies; unsigned int nr_of_link_frequencies; }; /** * struct v4l2_fwnode_link - a link between two endpoints * @local_node: pointer to device_node of this endpoint * @local_port: identifier of the port this endpoint belongs to * @remote_node: pointer to device_node of the remote endpoint * @remote_port: identifier of the port the remote endpoint belongs to */ struct v4l2_fwnode_link { struct fwnode_handle *local_node; unsigned int local_port; struct fwnode_handle *remote_node; unsigned int remote_port; }; int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode, struct v4l2_fwnode_endpoint *vep); struct v4l2_fwnode_endpoint *v4l2_fwnode_endpoint_alloc_parse( struct fwnode_handle *fwnode); void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep); int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode, struct v4l2_fwnode_link *link); void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link); /** * v4l2_async_notifier_parse_fwnode_endpoints - Parse V4L2 fwnode endpoints in a * device node * @dev: the device the endpoints of which are to be parsed * @notifier: notifier for @dev * @asd_struct_size: size of the driver's async sub-device struct, including * sizeof(struct v4l2_async_subdev). The &struct * v4l2_async_subdev shall be the first member of * the driver's async sub-device struct, i.e. both * begin at the same memory address. * @parse_endpoint: Driver's callback function called on each V4L2 fwnode * endpoint. Optional. * Return: %0 on success * %-ENOTCONN if the endpoint is to be skipped but this * should not be considered as an error * %-EINVAL if the endpoint configuration is invalid * * Parse the fwnode endpoints of the @dev device and populate the async sub- * devices array of the notifier. The @parse_endpoint callback function is * called for each endpoint with the corresponding async sub-device pointer to * let the caller initialize the driver-specific part of the async sub-device * structure. * * The notifier memory shall be zeroed before this function is called on the * notifier. * * This function may not be called on a registered notifier and may be called on * a notifier only once. * * Do not change the notifier's subdevs array, take references to the subdevs * array itself or change the notifier's num_subdevs field. This is because this * function allocates and reallocates the subdevs array based on parsing * endpoints. * * The &struct v4l2_fwnode_endpoint passed to the callback function * @parse_endpoint is released once the function is finished. If there is a need * to retain that configuration, the user needs to allocate memory for it. * * Any notifier populated using this function must be released with a call to * v4l2_async_notifier_cleanup() after it has been unregistered and the async * sub-devices are no longer in use, even if the function returned an error. * * Return: %0 on success, including when no async sub-devices are found * %-ENOMEM if memory allocation failed * %-EINVAL if graph or endpoint parsing failed * Other error codes as returned by @parse_endpoint */ int v4l2_async_notifier_parse_fwnode_endpoints( struct device *dev, struct v4l2_async_notifier *notifier, size_t asd_struct_size, int (*parse_endpoint)(struct device *dev, struct v4l2_fwnode_endpoint *vep, struct v4l2_async_subdev *asd)); /** * v4l2_async_notifier_parse_fwnode_endpoints_by_port - Parse V4L2 fwnode * endpoints of a port in a * device node * @dev: the device the endpoints of which are to be parsed * @notifier: notifier for @dev * @asd_struct_size: size of the driver's async sub-device struct, including * sizeof(struct v4l2_async_subdev). The &struct * v4l2_async_subdev shall be the first member of * the driver's async sub-device struct, i.e. both * begin at the same memory address. * @port: port number where endpoints are to be parsed * @parse_endpoint: Driver's callback function called on each V4L2 fwnode * endpoint. Optional. * Return: %0 on success * %-ENOTCONN if the endpoint is to be skipped but this * should not be considered as an error * %-EINVAL if the endpoint configuration is invalid * * This function is just like v4l2_async_notifier_parse_fwnode_endpoints() with * the exception that it only parses endpoints in a given port. This is useful * on devices that have both sinks and sources: the async sub-devices connected * to sources have already been configured by another driver (on capture * devices). In this case the driver must know which ports to parse. * * Parse the fwnode endpoints of the @dev device on a given @port and populate * the async sub-devices array of the notifier. The @parse_endpoint callback * function is called for each endpoint with the corresponding async sub-device * pointer to let the caller initialize the driver-specific part of the async * sub-device structure. * * The notifier memory shall be zeroed before this function is called on the * notifier the first time. * * This function may not be called on a registered notifier and may be called on * a notifier only once per port. * * Do not change the notifier's subdevs array, take references to the subdevs * array itself or change the notifier's num_subdevs field. This is because this * function allocates and reallocates the subdevs array based on parsing * endpoints. * * The &struct v4l2_fwnode_endpoint passed to the callback function * @parse_endpoint is released once the function is finished. If there is a need * to retain that configuration, the user needs to allocate memory for it. * * Any notifier populated using this function must be released with a call to * v4l2_async_notifier_cleanup() after it has been unregistered and the async * sub-devices are no longer in use, even if the function returned an error. * * Return: %0 on success, including when no async sub-devices are found * %-ENOMEM if memory allocation failed * %-EINVAL if graph or endpoint parsing failed * Other error codes as returned by @parse_endpoint */ int v4l2_async_notifier_parse_fwnode_endpoints_by_port( struct device *dev, struct v4l2_async_notifier *notifier, size_t asd_struct_size, unsigned int port, int (*parse_endpoint)(struct device *dev, struct v4l2_fwnode_endpoint *vep, struct v4l2_async_subdev *asd)); #endif /* _V4L2_FWNODE_H */