Commit | Line | Data |
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cc3f414c ST |
1 | /* |
2 | * OF helpers for parsing display timings | |
3 | * | |
4 | * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix | |
5 | * | |
6 | * based on of_videomode.c by Sascha Hauer <s.hauer@pengutronix.de> | |
7 | * | |
8 | * This file is released under the GPLv2 | |
9 | */ | |
10 | #include <linux/export.h> | |
11 | #include <linux/of.h> | |
12 | #include <linux/slab.h> | |
13 | #include <video/display_timing.h> | |
14 | #include <video/of_display_timing.h> | |
15 | ||
16 | /** | |
17 | * parse_timing_property - parse timing_entry from device_node | |
18 | * @np: device_node with the property | |
19 | * @name: name of the property | |
20 | * @result: will be set to the return value | |
21 | * | |
22 | * DESCRIPTION: | |
23 | * Every display_timing can be specified with either just the typical value or | |
24 | * a range consisting of min/typ/max. This function helps handling this | |
25 | **/ | |
f5836623 | 26 | static int parse_timing_property(const struct device_node *np, const char *name, |
cc3f414c ST |
27 | struct timing_entry *result) |
28 | { | |
29 | struct property *prop; | |
30 | int length, cells, ret; | |
31 | ||
32 | prop = of_find_property(np, name, &length); | |
33 | if (!prop) { | |
34 | pr_err("%s: could not find property %s\n", | |
35 | of_node_full_name(np), name); | |
36 | return -EINVAL; | |
37 | } | |
38 | ||
39 | cells = length / sizeof(u32); | |
40 | if (cells == 1) { | |
41 | ret = of_property_read_u32(np, name, &result->typ); | |
42 | result->min = result->typ; | |
43 | result->max = result->typ; | |
44 | } else if (cells == 3) { | |
45 | ret = of_property_read_u32_array(np, name, &result->min, cells); | |
46 | } else { | |
47 | pr_err("%s: illegal timing specification in %s\n", | |
48 | of_node_full_name(np), name); | |
49 | return -EINVAL; | |
50 | } | |
51 | ||
52 | return ret; | |
53 | } | |
54 | ||
55 | /** | |
ffa3fd21 | 56 | * of_parse_display_timing - parse display_timing entry from device_node |
cc3f414c ST |
57 | * @np: device_node with the properties |
58 | **/ | |
2e17c5a9 | 59 | static int of_parse_display_timing(const struct device_node *np, |
fcf7e6e5 | 60 | struct display_timing *dt) |
cc3f414c | 61 | { |
cc3f414c ST |
62 | u32 val = 0; |
63 | int ret = 0; | |
64 | ||
fcf7e6e5 | 65 | memset(dt, 0, sizeof(*dt)); |
cc3f414c ST |
66 | |
67 | ret |= parse_timing_property(np, "hback-porch", &dt->hback_porch); | |
68 | ret |= parse_timing_property(np, "hfront-porch", &dt->hfront_porch); | |
69 | ret |= parse_timing_property(np, "hactive", &dt->hactive); | |
70 | ret |= parse_timing_property(np, "hsync-len", &dt->hsync_len); | |
71 | ret |= parse_timing_property(np, "vback-porch", &dt->vback_porch); | |
72 | ret |= parse_timing_property(np, "vfront-porch", &dt->vfront_porch); | |
73 | ret |= parse_timing_property(np, "vactive", &dt->vactive); | |
74 | ret |= parse_timing_property(np, "vsync-len", &dt->vsync_len); | |
75 | ret |= parse_timing_property(np, "clock-frequency", &dt->pixelclock); | |
76 | ||
06a33079 | 77 | dt->flags = 0; |
cc3f414c | 78 | if (!of_property_read_u32(np, "vsync-active", &val)) |
06a33079 TV |
79 | dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH : |
80 | DISPLAY_FLAGS_VSYNC_LOW; | |
cc3f414c | 81 | if (!of_property_read_u32(np, "hsync-active", &val)) |
06a33079 TV |
82 | dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH : |
83 | DISPLAY_FLAGS_HSYNC_LOW; | |
cc3f414c | 84 | if (!of_property_read_u32(np, "de-active", &val)) |
06a33079 | 85 | dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH : |
cc3f414c ST |
86 | DISPLAY_FLAGS_DE_LOW; |
87 | if (!of_property_read_u32(np, "pixelclk-active", &val)) | |
06a33079 | 88 | dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE : |
cc3f414c ST |
89 | DISPLAY_FLAGS_PIXDATA_NEGEDGE; |
90 | ||
91 | if (of_property_read_bool(np, "interlaced")) | |
06a33079 | 92 | dt->flags |= DISPLAY_FLAGS_INTERLACED; |
cc3f414c | 93 | if (of_property_read_bool(np, "doublescan")) |
06a33079 | 94 | dt->flags |= DISPLAY_FLAGS_DOUBLESCAN; |
2d178a4a ST |
95 | if (of_property_read_bool(np, "doubleclk")) |
96 | dt->flags |= DISPLAY_FLAGS_DOUBLECLK; | |
cc3f414c ST |
97 | |
98 | if (ret) { | |
99 | pr_err("%s: error reading timing properties\n", | |
100 | of_node_full_name(np)); | |
fcf7e6e5 | 101 | return -EINVAL; |
cc3f414c ST |
102 | } |
103 | ||
fcf7e6e5 | 104 | return 0; |
cc3f414c ST |
105 | } |
106 | ||
ffa3fd21 TV |
107 | /** |
108 | * of_get_display_timing - parse a display_timing entry | |
109 | * @np: device_node with the timing subnode | |
110 | * @name: name of the timing node | |
111 | * @dt: display_timing struct to fill | |
112 | **/ | |
113 | int of_get_display_timing(struct device_node *np, const char *name, | |
114 | struct display_timing *dt) | |
115 | { | |
116 | struct device_node *timing_np; | |
117 | ||
118 | if (!np) { | |
119 | pr_err("%s: no devicenode given\n", of_node_full_name(np)); | |
120 | return -EINVAL; | |
121 | } | |
122 | ||
123 | timing_np = of_find_node_by_name(np, name); | |
124 | if (!timing_np) { | |
125 | pr_err("%s: could not find node '%s'\n", | |
126 | of_node_full_name(np), name); | |
127 | return -ENOENT; | |
128 | } | |
129 | ||
130 | return of_parse_display_timing(timing_np, dt); | |
131 | } | |
132 | EXPORT_SYMBOL_GPL(of_get_display_timing); | |
133 | ||
cc3f414c ST |
134 | /** |
135 | * of_get_display_timings - parse all display_timing entries from a device_node | |
136 | * @np: device_node with the subnodes | |
137 | **/ | |
138 | struct display_timings *of_get_display_timings(struct device_node *np) | |
139 | { | |
140 | struct device_node *timings_np; | |
141 | struct device_node *entry; | |
142 | struct device_node *native_mode; | |
143 | struct display_timings *disp; | |
144 | ||
145 | if (!np) { | |
146 | pr_err("%s: no devicenode given\n", of_node_full_name(np)); | |
147 | return NULL; | |
148 | } | |
149 | ||
150 | timings_np = of_find_node_by_name(np, "display-timings"); | |
151 | if (!timings_np) { | |
152 | pr_err("%s: could not find display-timings node\n", | |
153 | of_node_full_name(np)); | |
154 | return NULL; | |
155 | } | |
156 | ||
157 | disp = kzalloc(sizeof(*disp), GFP_KERNEL); | |
158 | if (!disp) { | |
159 | pr_err("%s: could not allocate struct disp'\n", | |
160 | of_node_full_name(np)); | |
161 | goto dispfail; | |
162 | } | |
163 | ||
164 | entry = of_parse_phandle(timings_np, "native-mode", 0); | |
165 | /* assume first child as native mode if none provided */ | |
166 | if (!entry) | |
167 | entry = of_get_next_child(np, NULL); | |
168 | /* if there is no child, it is useless to go on */ | |
169 | if (!entry) { | |
170 | pr_err("%s: no timing specifications given\n", | |
171 | of_node_full_name(np)); | |
172 | goto entryfail; | |
173 | } | |
174 | ||
175 | pr_debug("%s: using %s as default timing\n", | |
176 | of_node_full_name(np), entry->name); | |
177 | ||
178 | native_mode = entry; | |
179 | ||
180 | disp->num_timings = of_get_child_count(timings_np); | |
181 | if (disp->num_timings == 0) { | |
182 | /* should never happen, as entry was already found above */ | |
183 | pr_err("%s: no timings specified\n", of_node_full_name(np)); | |
184 | goto entryfail; | |
185 | } | |
186 | ||
187 | disp->timings = kzalloc(sizeof(struct display_timing *) * | |
188 | disp->num_timings, GFP_KERNEL); | |
189 | if (!disp->timings) { | |
190 | pr_err("%s: could not allocate timings array\n", | |
191 | of_node_full_name(np)); | |
192 | goto entryfail; | |
193 | } | |
194 | ||
195 | disp->num_timings = 0; | |
196 | disp->native_mode = 0; | |
197 | ||
198 | for_each_child_of_node(timings_np, entry) { | |
199 | struct display_timing *dt; | |
fcf7e6e5 | 200 | int r; |
cc3f414c | 201 | |
fcf7e6e5 | 202 | dt = kzalloc(sizeof(*dt), GFP_KERNEL); |
cc3f414c | 203 | if (!dt) { |
fcf7e6e5 TV |
204 | pr_err("%s: could not allocate display_timing struct\n", |
205 | of_node_full_name(np)); | |
206 | goto timingfail; | |
207 | } | |
208 | ||
ffa3fd21 | 209 | r = of_parse_display_timing(entry, dt); |
fcf7e6e5 | 210 | if (r) { |
cc3f414c ST |
211 | /* |
212 | * to not encourage wrong devicetrees, fail in case of | |
213 | * an error | |
214 | */ | |
215 | pr_err("%s: error in timing %d\n", | |
216 | of_node_full_name(np), disp->num_timings + 1); | |
217 | goto timingfail; | |
218 | } | |
219 | ||
220 | if (native_mode == entry) | |
221 | disp->native_mode = disp->num_timings; | |
222 | ||
223 | disp->timings[disp->num_timings] = dt; | |
224 | disp->num_timings++; | |
225 | } | |
226 | of_node_put(timings_np); | |
227 | /* | |
228 | * native_mode points to the device_node returned by of_parse_phandle | |
229 | * therefore call of_node_put on it | |
230 | */ | |
231 | of_node_put(native_mode); | |
232 | ||
233 | pr_debug("%s: got %d timings. Using timing #%d as default\n", | |
234 | of_node_full_name(np), disp->num_timings, | |
235 | disp->native_mode + 1); | |
236 | ||
237 | return disp; | |
238 | ||
239 | timingfail: | |
240 | if (native_mode) | |
241 | of_node_put(native_mode); | |
242 | display_timings_release(disp); | |
243 | entryfail: | |
244 | kfree(disp); | |
245 | dispfail: | |
246 | of_node_put(timings_np); | |
247 | return NULL; | |
248 | } | |
249 | EXPORT_SYMBOL_GPL(of_get_display_timings); | |
250 | ||
251 | /** | |
252 | * of_display_timings_exist - check if a display-timings node is provided | |
253 | * @np: device_node with the timing | |
254 | **/ | |
255 | int of_display_timings_exist(struct device_node *np) | |
256 | { | |
257 | struct device_node *timings_np; | |
258 | ||
259 | if (!np) | |
260 | return -EINVAL; | |
261 | ||
262 | timings_np = of_parse_phandle(np, "display-timings", 0); | |
263 | if (!timings_np) | |
264 | return -EINVAL; | |
265 | ||
266 | of_node_put(timings_np); | |
267 | return 1; | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(of_display_timings_exist); |