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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) { | |
6d7e6533 | 34 | pr_err("%pOF: could not find property %s\n", np, name); |
cc3f414c ST |
35 | return -EINVAL; |
36 | } | |
37 | ||
38 | cells = length / sizeof(u32); | |
39 | if (cells == 1) { | |
40 | ret = of_property_read_u32(np, name, &result->typ); | |
41 | result->min = result->typ; | |
42 | result->max = result->typ; | |
43 | } else if (cells == 3) { | |
44 | ret = of_property_read_u32_array(np, name, &result->min, cells); | |
45 | } else { | |
6d7e6533 | 46 | pr_err("%pOF: illegal timing specification in %s\n", np, name); |
cc3f414c ST |
47 | return -EINVAL; |
48 | } | |
49 | ||
50 | return ret; | |
51 | } | |
52 | ||
53 | /** | |
ffa3fd21 | 54 | * of_parse_display_timing - parse display_timing entry from device_node |
cc3f414c ST |
55 | * @np: device_node with the properties |
56 | **/ | |
2e17c5a9 | 57 | static int of_parse_display_timing(const struct device_node *np, |
fcf7e6e5 | 58 | struct display_timing *dt) |
cc3f414c | 59 | { |
cc3f414c ST |
60 | u32 val = 0; |
61 | int ret = 0; | |
62 | ||
fcf7e6e5 | 63 | memset(dt, 0, sizeof(*dt)); |
cc3f414c ST |
64 | |
65 | ret |= parse_timing_property(np, "hback-porch", &dt->hback_porch); | |
66 | ret |= parse_timing_property(np, "hfront-porch", &dt->hfront_porch); | |
67 | ret |= parse_timing_property(np, "hactive", &dt->hactive); | |
68 | ret |= parse_timing_property(np, "hsync-len", &dt->hsync_len); | |
69 | ret |= parse_timing_property(np, "vback-porch", &dt->vback_porch); | |
70 | ret |= parse_timing_property(np, "vfront-porch", &dt->vfront_porch); | |
71 | ret |= parse_timing_property(np, "vactive", &dt->vactive); | |
72 | ret |= parse_timing_property(np, "vsync-len", &dt->vsync_len); | |
73 | ret |= parse_timing_property(np, "clock-frequency", &dt->pixelclock); | |
74 | ||
06a33079 | 75 | dt->flags = 0; |
cc3f414c | 76 | if (!of_property_read_u32(np, "vsync-active", &val)) |
06a33079 TV |
77 | dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH : |
78 | DISPLAY_FLAGS_VSYNC_LOW; | |
cc3f414c | 79 | if (!of_property_read_u32(np, "hsync-active", &val)) |
06a33079 TV |
80 | dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH : |
81 | DISPLAY_FLAGS_HSYNC_LOW; | |
cc3f414c | 82 | if (!of_property_read_u32(np, "de-active", &val)) |
06a33079 | 83 | dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH : |
cc3f414c ST |
84 | DISPLAY_FLAGS_DE_LOW; |
85 | if (!of_property_read_u32(np, "pixelclk-active", &val)) | |
06a33079 | 86 | dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE : |
cc3f414c ST |
87 | DISPLAY_FLAGS_PIXDATA_NEGEDGE; |
88 | ||
bd9642b9 PU |
89 | if (!of_property_read_u32(np, "syncclk-active", &val)) |
90 | dt->flags |= val ? DISPLAY_FLAGS_SYNC_POSEDGE : | |
91 | DISPLAY_FLAGS_SYNC_NEGEDGE; | |
92 | else if (dt->flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE | | |
93 | DISPLAY_FLAGS_PIXDATA_NEGEDGE)) | |
94 | dt->flags |= dt->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE ? | |
95 | DISPLAY_FLAGS_SYNC_POSEDGE : | |
96 | DISPLAY_FLAGS_SYNC_NEGEDGE; | |
97 | ||
cc3f414c | 98 | if (of_property_read_bool(np, "interlaced")) |
06a33079 | 99 | dt->flags |= DISPLAY_FLAGS_INTERLACED; |
cc3f414c | 100 | if (of_property_read_bool(np, "doublescan")) |
06a33079 | 101 | dt->flags |= DISPLAY_FLAGS_DOUBLESCAN; |
2d178a4a ST |
102 | if (of_property_read_bool(np, "doubleclk")) |
103 | dt->flags |= DISPLAY_FLAGS_DOUBLECLK; | |
cc3f414c ST |
104 | |
105 | if (ret) { | |
6d7e6533 | 106 | pr_err("%pOF: error reading timing properties\n", np); |
fcf7e6e5 | 107 | return -EINVAL; |
cc3f414c ST |
108 | } |
109 | ||
fcf7e6e5 | 110 | return 0; |
cc3f414c ST |
111 | } |
112 | ||
ffa3fd21 TV |
113 | /** |
114 | * of_get_display_timing - parse a display_timing entry | |
115 | * @np: device_node with the timing subnode | |
116 | * @name: name of the timing node | |
117 | * @dt: display_timing struct to fill | |
118 | **/ | |
f5a000c9 | 119 | int of_get_display_timing(const struct device_node *np, const char *name, |
ffa3fd21 TV |
120 | struct display_timing *dt) |
121 | { | |
122 | struct device_node *timing_np; | |
123 | ||
dc42715f | 124 | if (!np) |
ffa3fd21 | 125 | return -EINVAL; |
ffa3fd21 | 126 | |
60119a1d | 127 | timing_np = of_get_child_by_name(np, name); |
ffa3fd21 | 128 | if (!timing_np) { |
6d7e6533 | 129 | pr_err("%pOF: could not find node '%s'\n", np, name); |
ffa3fd21 TV |
130 | return -ENOENT; |
131 | } | |
132 | ||
133 | return of_parse_display_timing(timing_np, dt); | |
134 | } | |
135 | EXPORT_SYMBOL_GPL(of_get_display_timing); | |
136 | ||
cc3f414c ST |
137 | /** |
138 | * of_get_display_timings - parse all display_timing entries from a device_node | |
139 | * @np: device_node with the subnodes | |
140 | **/ | |
f5a000c9 | 141 | struct display_timings *of_get_display_timings(const struct device_node *np) |
cc3f414c ST |
142 | { |
143 | struct device_node *timings_np; | |
144 | struct device_node *entry; | |
145 | struct device_node *native_mode; | |
146 | struct display_timings *disp; | |
147 | ||
dc42715f | 148 | if (!np) |
cc3f414c | 149 | return NULL; |
cc3f414c | 150 | |
60119a1d | 151 | timings_np = of_get_child_by_name(np, "display-timings"); |
cc3f414c | 152 | if (!timings_np) { |
6d7e6533 | 153 | pr_err("%pOF: could not find display-timings node\n", np); |
cc3f414c ST |
154 | return NULL; |
155 | } | |
156 | ||
157 | disp = kzalloc(sizeof(*disp), GFP_KERNEL); | |
158 | if (!disp) { | |
6d7e6533 | 159 | pr_err("%pOF: could not allocate struct disp'\n", np); |
cc3f414c ST |
160 | goto dispfail; |
161 | } | |
162 | ||
163 | entry = of_parse_phandle(timings_np, "native-mode", 0); | |
164 | /* assume first child as native mode if none provided */ | |
165 | if (!entry) | |
80c68c1e | 166 | entry = of_get_next_child(timings_np, NULL); |
cc3f414c ST |
167 | /* if there is no child, it is useless to go on */ |
168 | if (!entry) { | |
6d7e6533 | 169 | pr_err("%pOF: no timing specifications given\n", np); |
cc3f414c ST |
170 | goto entryfail; |
171 | } | |
172 | ||
6d7e6533 | 173 | pr_debug("%pOF: using %s as default timing\n", np, entry->name); |
cc3f414c ST |
174 | |
175 | native_mode = entry; | |
176 | ||
177 | disp->num_timings = of_get_child_count(timings_np); | |
178 | if (disp->num_timings == 0) { | |
179 | /* should never happen, as entry was already found above */ | |
6d7e6533 | 180 | pr_err("%pOF: no timings specified\n", np); |
cc3f414c ST |
181 | goto entryfail; |
182 | } | |
183 | ||
184 | disp->timings = kzalloc(sizeof(struct display_timing *) * | |
185 | disp->num_timings, GFP_KERNEL); | |
186 | if (!disp->timings) { | |
6d7e6533 | 187 | pr_err("%pOF: could not allocate timings array\n", np); |
cc3f414c ST |
188 | goto entryfail; |
189 | } | |
190 | ||
191 | disp->num_timings = 0; | |
192 | disp->native_mode = 0; | |
193 | ||
194 | for_each_child_of_node(timings_np, entry) { | |
195 | struct display_timing *dt; | |
fcf7e6e5 | 196 | int r; |
cc3f414c | 197 | |
fcf7e6e5 | 198 | dt = kzalloc(sizeof(*dt), GFP_KERNEL); |
cc3f414c | 199 | if (!dt) { |
6d7e6533 RH |
200 | pr_err("%pOF: could not allocate display_timing struct\n", |
201 | np); | |
fcf7e6e5 TV |
202 | goto timingfail; |
203 | } | |
204 | ||
ffa3fd21 | 205 | r = of_parse_display_timing(entry, dt); |
fcf7e6e5 | 206 | if (r) { |
cc3f414c ST |
207 | /* |
208 | * to not encourage wrong devicetrees, fail in case of | |
209 | * an error | |
210 | */ | |
6d7e6533 RH |
211 | pr_err("%pOF: error in timing %d\n", |
212 | np, disp->num_timings + 1); | |
d663baba | 213 | kfree(dt); |
cc3f414c ST |
214 | goto timingfail; |
215 | } | |
216 | ||
217 | if (native_mode == entry) | |
218 | disp->native_mode = disp->num_timings; | |
219 | ||
220 | disp->timings[disp->num_timings] = dt; | |
221 | disp->num_timings++; | |
222 | } | |
223 | of_node_put(timings_np); | |
224 | /* | |
225 | * native_mode points to the device_node returned by of_parse_phandle | |
226 | * therefore call of_node_put on it | |
227 | */ | |
228 | of_node_put(native_mode); | |
229 | ||
6d7e6533 RH |
230 | pr_debug("%pOF: got %d timings. Using timing #%d as default\n", |
231 | np, disp->num_timings, | |
cc3f414c ST |
232 | disp->native_mode + 1); |
233 | ||
234 | return disp; | |
235 | ||
236 | timingfail: | |
68ecfe2f | 237 | of_node_put(native_mode); |
cc3f414c | 238 | display_timings_release(disp); |
62795a0d | 239 | disp = NULL; |
cc3f414c ST |
240 | entryfail: |
241 | kfree(disp); | |
242 | dispfail: | |
243 | of_node_put(timings_np); | |
244 | return NULL; | |
245 | } | |
246 | EXPORT_SYMBOL_GPL(of_get_display_timings); | |
247 | ||
248 | /** | |
249 | * of_display_timings_exist - check if a display-timings node is provided | |
250 | * @np: device_node with the timing | |
251 | **/ | |
f5a000c9 | 252 | int of_display_timings_exist(const struct device_node *np) |
cc3f414c ST |
253 | { |
254 | struct device_node *timings_np; | |
255 | ||
256 | if (!np) | |
257 | return -EINVAL; | |
258 | ||
259 | timings_np = of_parse_phandle(np, "display-timings", 0); | |
260 | if (!timings_np) | |
261 | return -EINVAL; | |
262 | ||
263 | of_node_put(timings_np); | |
264 | return 1; | |
265 | } | |
266 | EXPORT_SYMBOL_GPL(of_display_timings_exist); |