2 * V4L2 OF binding parsing library
4 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
5 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
7 * Copyright (C) 2012 Renesas Electronics Corp.
8 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
14 #include <linux/kernel.h>
15 #include <linux/module.h>
17 #include <linux/string.h>
18 #include <linux/types.h>
20 #include <media/v4l2-of.h>
22 static int v4l2_of_parse_csi_bus(const struct device_node *node,
23 struct v4l2_of_endpoint *endpoint)
25 struct v4l2_of_bus_mipi_csi2 *bus = &endpoint->bus.mipi_csi2;
26 struct property *prop;
27 bool have_clk_lane = false;
28 unsigned int flags = 0;
31 prop = of_find_property(node, "data-lanes", NULL);
33 const __be32 *lane = NULL;
36 for (i = 0; i < ARRAY_SIZE(bus->data_lanes); i++) {
37 lane = of_prop_next_u32(prop, lane, &v);
40 bus->data_lanes[i] = v;
42 bus->num_data_lanes = i;
45 prop = of_find_property(node, "lane-polarities", NULL);
47 const __be32 *polarity = NULL;
50 for (i = 0; i < ARRAY_SIZE(bus->lane_polarities); i++) {
51 polarity = of_prop_next_u32(prop, polarity, &v);
54 bus->lane_polarities[i] = v;
57 if (i < 1 + bus->num_data_lanes /* clock + data */) {
58 pr_warn("%s: too few lane-polarities entries (need %u, got %u)\n",
59 node->full_name, 1 + bus->num_data_lanes, i);
64 if (!of_property_read_u32(node, "clock-lanes", &v)) {
69 if (of_get_property(node, "clock-noncontinuous", &v))
70 flags |= V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
71 else if (have_clk_lane || bus->num_data_lanes > 0)
72 flags |= V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
75 endpoint->bus_type = V4L2_MBUS_CSI2;
80 static void v4l2_of_parse_parallel_bus(const struct device_node *node,
81 struct v4l2_of_endpoint *endpoint)
83 struct v4l2_of_bus_parallel *bus = &endpoint->bus.parallel;
84 unsigned int flags = 0;
87 if (!of_property_read_u32(node, "hsync-active", &v))
88 flags |= v ? V4L2_MBUS_HSYNC_ACTIVE_HIGH :
89 V4L2_MBUS_HSYNC_ACTIVE_LOW;
91 if (!of_property_read_u32(node, "vsync-active", &v))
92 flags |= v ? V4L2_MBUS_VSYNC_ACTIVE_HIGH :
93 V4L2_MBUS_VSYNC_ACTIVE_LOW;
95 if (!of_property_read_u32(node, "pclk-sample", &v))
96 flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING :
97 V4L2_MBUS_PCLK_SAMPLE_FALLING;
99 if (!of_property_read_u32(node, "field-even-active", &v))
100 flags |= v ? V4L2_MBUS_FIELD_EVEN_HIGH :
101 V4L2_MBUS_FIELD_EVEN_LOW;
103 endpoint->bus_type = V4L2_MBUS_PARALLEL;
105 endpoint->bus_type = V4L2_MBUS_BT656;
107 if (!of_property_read_u32(node, "data-active", &v))
108 flags |= v ? V4L2_MBUS_DATA_ACTIVE_HIGH :
109 V4L2_MBUS_DATA_ACTIVE_LOW;
111 if (of_get_property(node, "slave-mode", &v))
112 flags |= V4L2_MBUS_SLAVE;
114 flags |= V4L2_MBUS_MASTER;
116 if (!of_property_read_u32(node, "bus-width", &v))
119 if (!of_property_read_u32(node, "data-shift", &v))
122 if (!of_property_read_u32(node, "sync-on-green-active", &v))
123 flags |= v ? V4L2_MBUS_VIDEO_SOG_ACTIVE_HIGH :
124 V4L2_MBUS_VIDEO_SOG_ACTIVE_LOW;
131 * v4l2_of_parse_endpoint() - parse all endpoint node properties
132 * @node: pointer to endpoint device_node
133 * @endpoint: pointer to the V4L2 OF endpoint data structure
135 * All properties are optional. If none are found, we don't set any flags.
136 * This means the port has a static configuration and no properties have
137 * to be specified explicitly.
138 * If any properties that identify the bus as parallel are found and
139 * slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if we recognise
140 * the bus as serial CSI-2 and clock-noncontinuous isn't set, we set the
141 * V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag.
142 * The caller should hold a reference to @node.
146 int v4l2_of_parse_endpoint(const struct device_node *node,
147 struct v4l2_of_endpoint *endpoint)
151 of_graph_parse_endpoint(node, &endpoint->base);
152 endpoint->bus_type = 0;
153 memset(&endpoint->bus, 0, sizeof(endpoint->bus));
155 rval = v4l2_of_parse_csi_bus(node, endpoint);
159 * Parse the parallel video bus properties only if none
160 * of the MIPI CSI-2 specific properties were found.
162 if (endpoint->bus.mipi_csi2.flags == 0)
163 v4l2_of_parse_parallel_bus(node, endpoint);
167 EXPORT_SYMBOL(v4l2_of_parse_endpoint);
170 * v4l2_of_parse_link() - parse a link between two endpoints
171 * @node: pointer to the endpoint at the local end of the link
172 * @link: pointer to the V4L2 OF link data structure
174 * Fill the link structure with the local and remote nodes and port numbers.
175 * The local_node and remote_node fields are set to point to the local and
176 * remote port's parent nodes respectively (the port parent node being the
177 * parent node of the port node if that node isn't a 'ports' node, or the
178 * grand-parent node of the port node otherwise).
180 * A reference is taken to both the local and remote nodes, the caller must use
181 * v4l2_of_put_link() to drop the references when done with the link.
183 * Return: 0 on success, or -ENOLINK if the remote endpoint can't be found.
185 int v4l2_of_parse_link(const struct device_node *node,
186 struct v4l2_of_link *link)
188 struct device_node *np;
190 memset(link, 0, sizeof(*link));
192 np = of_get_parent(node);
193 of_property_read_u32(np, "reg", &link->local_port);
194 np = of_get_next_parent(np);
195 if (of_node_cmp(np->name, "ports") == 0)
196 np = of_get_next_parent(np);
197 link->local_node = np;
199 np = of_parse_phandle(node, "remote-endpoint", 0);
201 of_node_put(link->local_node);
205 np = of_get_parent(np);
206 of_property_read_u32(np, "reg", &link->remote_port);
207 np = of_get_next_parent(np);
208 if (of_node_cmp(np->name, "ports") == 0)
209 np = of_get_next_parent(np);
210 link->remote_node = np;
214 EXPORT_SYMBOL(v4l2_of_parse_link);
217 * v4l2_of_put_link() - drop references to nodes in a link
218 * @link: pointer to the V4L2 OF link data structure
220 * Drop references to the local and remote nodes in the link. This function must
221 * be called on every link parsed with v4l2_of_parse_link().
223 void v4l2_of_put_link(struct v4l2_of_link *link)
225 of_node_put(link->local_node);
226 of_node_put(link->remote_node);
228 EXPORT_SYMBOL(v4l2_of_put_link);