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99fd133f GL |
1 | /* |
2 | * V4L2 OF binding parsing library | |
3 | * | |
4 | * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. | |
c6e8d96d | 5 | * Author: Sylwester Nawrocki <s.nawrocki@samsung.com> |
99fd133f GL |
6 | * |
7 | * Copyright (C) 2012 Renesas Electronics Corp. | |
8 | * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de> | |
9 | * | |
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. | |
13 | */ | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/of.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/types.h> | |
19 | ||
20 | #include <media/v4l2-of.h> | |
21 | ||
b6eec1c4 SA |
22 | static int v4l2_of_parse_csi_bus(const struct device_node *node, |
23 | struct v4l2_of_endpoint *endpoint) | |
99fd133f GL |
24 | { |
25 | struct v4l2_of_bus_mipi_csi2 *bus = &endpoint->bus.mipi_csi2; | |
99fd133f GL |
26 | struct property *prop; |
27 | bool have_clk_lane = false; | |
28 | unsigned int flags = 0; | |
29 | u32 v; | |
30 | ||
31 | prop = of_find_property(node, "data-lanes", NULL); | |
32 | if (prop) { | |
33 | const __be32 *lane = NULL; | |
b6eec1c4 | 34 | unsigned int i; |
99fd133f | 35 | |
b6eec1c4 SA |
36 | for (i = 0; i < ARRAY_SIZE(bus->data_lanes); i++) { |
37 | lane = of_prop_next_u32(prop, lane, &v); | |
99fd133f GL |
38 | if (!lane) |
39 | break; | |
b6eec1c4 | 40 | bus->data_lanes[i] = v; |
99fd133f GL |
41 | } |
42 | bus->num_data_lanes = i; | |
b6eec1c4 SA |
43 | } |
44 | ||
45 | prop = of_find_property(node, "lane-polarities", NULL); | |
46 | if (prop) { | |
47 | const __be32 *polarity = NULL; | |
48 | unsigned int i; | |
49 | ||
50 | for (i = 0; i < ARRAY_SIZE(bus->lane_polarities); i++) { | |
51 | polarity = of_prop_next_u32(prop, polarity, &v); | |
52 | if (!polarity) | |
53 | break; | |
54 | bus->lane_polarities[i] = v; | |
55 | } | |
56 | ||
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); | |
60 | return -EINVAL; | |
61 | } | |
99fd133f GL |
62 | } |
63 | ||
64 | if (!of_property_read_u32(node, "clock-lanes", &v)) { | |
65 | bus->clock_lane = v; | |
66 | have_clk_lane = true; | |
67 | } | |
68 | ||
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; | |
73 | ||
74 | bus->flags = flags; | |
75 | endpoint->bus_type = V4L2_MBUS_CSI2; | |
b6eec1c4 SA |
76 | |
77 | return 0; | |
99fd133f GL |
78 | } |
79 | ||
80 | static void v4l2_of_parse_parallel_bus(const struct device_node *node, | |
81 | struct v4l2_of_endpoint *endpoint) | |
82 | { | |
83 | struct v4l2_of_bus_parallel *bus = &endpoint->bus.parallel; | |
84 | unsigned int flags = 0; | |
85 | u32 v; | |
86 | ||
87 | if (!of_property_read_u32(node, "hsync-active", &v)) | |
88 | flags |= v ? V4L2_MBUS_HSYNC_ACTIVE_HIGH : | |
89 | V4L2_MBUS_HSYNC_ACTIVE_LOW; | |
90 | ||
91 | if (!of_property_read_u32(node, "vsync-active", &v)) | |
92 | flags |= v ? V4L2_MBUS_VSYNC_ACTIVE_HIGH : | |
93 | V4L2_MBUS_VSYNC_ACTIVE_LOW; | |
94 | ||
95 | if (!of_property_read_u32(node, "pclk-sample", &v)) | |
96 | flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING : | |
97 | V4L2_MBUS_PCLK_SAMPLE_FALLING; | |
98 | ||
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; | |
102 | if (flags) | |
103 | endpoint->bus_type = V4L2_MBUS_PARALLEL; | |
104 | else | |
105 | endpoint->bus_type = V4L2_MBUS_BT656; | |
106 | ||
107 | if (!of_property_read_u32(node, "data-active", &v)) | |
108 | flags |= v ? V4L2_MBUS_DATA_ACTIVE_HIGH : | |
109 | V4L2_MBUS_DATA_ACTIVE_LOW; | |
110 | ||
111 | if (of_get_property(node, "slave-mode", &v)) | |
112 | flags |= V4L2_MBUS_SLAVE; | |
113 | else | |
114 | flags |= V4L2_MBUS_MASTER; | |
115 | ||
116 | if (!of_property_read_u32(node, "bus-width", &v)) | |
117 | bus->bus_width = v; | |
118 | ||
119 | if (!of_property_read_u32(node, "data-shift", &v)) | |
120 | bus->data_shift = v; | |
121 | ||
d1d70aa6 LP |
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; | |
125 | ||
99fd133f GL |
126 | bus->flags = flags; |
127 | ||
128 | } | |
99fd133f GL |
129 | |
130 | /** | |
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 | |
134 | * | |
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. | |
9ff889b6 LP |
143 | * |
144 | * Return: 0. | |
99fd133f | 145 | */ |
9ff889b6 LP |
146 | int v4l2_of_parse_endpoint(const struct device_node *node, |
147 | struct v4l2_of_endpoint *endpoint) | |
99fd133f | 148 | { |
b6eec1c4 SA |
149 | int rval; |
150 | ||
f2a575f6 PZ |
151 | of_graph_parse_endpoint(node, &endpoint->base); |
152 | endpoint->bus_type = 0; | |
153 | memset(&endpoint->bus, 0, sizeof(endpoint->bus)); | |
99fd133f | 154 | |
b6eec1c4 SA |
155 | rval = v4l2_of_parse_csi_bus(node, endpoint); |
156 | if (rval) | |
157 | return rval; | |
99fd133f GL |
158 | /* |
159 | * Parse the parallel video bus properties only if none | |
160 | * of the MIPI CSI-2 specific properties were found. | |
161 | */ | |
162 | if (endpoint->bus.mipi_csi2.flags == 0) | |
163 | v4l2_of_parse_parallel_bus(node, endpoint); | |
164 | ||
9ff889b6 | 165 | return 0; |
99fd133f GL |
166 | } |
167 | EXPORT_SYMBOL(v4l2_of_parse_endpoint); | |
c9bca8b3 LP |
168 | |
169 | /** | |
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 | |
173 | * | |
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). | |
179 | * | |
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. | |
182 | * | |
183 | * Return: 0 on success, or -ENOLINK if the remote endpoint can't be found. | |
184 | */ | |
185 | int v4l2_of_parse_link(const struct device_node *node, | |
186 | struct v4l2_of_link *link) | |
187 | { | |
188 | struct device_node *np; | |
189 | ||
190 | memset(link, 0, sizeof(*link)); | |
191 | ||
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; | |
198 | ||
199 | np = of_parse_phandle(node, "remote-endpoint", 0); | |
200 | if (!np) { | |
201 | of_node_put(link->local_node); | |
202 | return -ENOLINK; | |
203 | } | |
204 | ||
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; | |
211 | ||
212 | return 0; | |
213 | } | |
214 | EXPORT_SYMBOL(v4l2_of_parse_link); | |
215 | ||
216 | /** | |
217 | * v4l2_of_put_link() - drop references to nodes in a link | |
218 | * @link: pointer to the V4L2 OF link data structure | |
219 | * | |
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(). | |
222 | */ | |
223 | void v4l2_of_put_link(struct v4l2_of_link *link) | |
224 | { | |
225 | of_node_put(link->local_node); | |
226 | of_node_put(link->remote_node); | |
227 | } | |
228 | EXPORT_SYMBOL(v4l2_of_put_link); |