Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 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 | **/ |
Steffen Trumtrar | f583662 | 2013-05-27 12:33:05 +0000 | [diff] [blame] | 26 | static int parse_timing_property(const struct device_node *np, const char *name, |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 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 | /** |
Tomi Valkeinen | ffa3fd2 | 2013-05-16 15:36:38 +0300 | [diff] [blame] | 56 | * of_parse_display_timing - parse display_timing entry from device_node |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 57 | * @np: device_node with the properties |
| 58 | **/ |
Linus Torvalds | 2e17c5a | 2013-07-09 16:04:31 -0700 | [diff] [blame] | 59 | static int of_parse_display_timing(const struct device_node *np, |
Tomi Valkeinen | fcf7e6e | 2013-05-16 15:29:06 +0300 | [diff] [blame] | 60 | struct display_timing *dt) |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 61 | { |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 62 | u32 val = 0; |
| 63 | int ret = 0; |
| 64 | |
Tomi Valkeinen | fcf7e6e | 2013-05-16 15:29:06 +0300 | [diff] [blame] | 65 | memset(dt, 0, sizeof(*dt)); |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 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 | |
Tomi Valkeinen | 06a3307 | 2013-03-12 10:26:45 +0200 | [diff] [blame] | 77 | dt->flags = 0; |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 78 | if (!of_property_read_u32(np, "vsync-active", &val)) |
Tomi Valkeinen | 06a3307 | 2013-03-12 10:26:45 +0200 | [diff] [blame] | 79 | dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH : |
| 80 | DISPLAY_FLAGS_VSYNC_LOW; |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 81 | if (!of_property_read_u32(np, "hsync-active", &val)) |
Tomi Valkeinen | 06a3307 | 2013-03-12 10:26:45 +0200 | [diff] [blame] | 82 | dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH : |
| 83 | DISPLAY_FLAGS_HSYNC_LOW; |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 84 | if (!of_property_read_u32(np, "de-active", &val)) |
Tomi Valkeinen | 06a3307 | 2013-03-12 10:26:45 +0200 | [diff] [blame] | 85 | dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH : |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 86 | DISPLAY_FLAGS_DE_LOW; |
| 87 | if (!of_property_read_u32(np, "pixelclk-active", &val)) |
Tomi Valkeinen | 06a3307 | 2013-03-12 10:26:45 +0200 | [diff] [blame] | 88 | dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE : |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 89 | DISPLAY_FLAGS_PIXDATA_NEGEDGE; |
| 90 | |
Peter Ujfalusi | bd9642b | 2016-09-22 13:35:26 +0300 | [diff] [blame] | 91 | if (!of_property_read_u32(np, "syncclk-active", &val)) |
| 92 | dt->flags |= val ? DISPLAY_FLAGS_SYNC_POSEDGE : |
| 93 | DISPLAY_FLAGS_SYNC_NEGEDGE; |
| 94 | else if (dt->flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE | |
| 95 | DISPLAY_FLAGS_PIXDATA_NEGEDGE)) |
| 96 | dt->flags |= dt->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE ? |
| 97 | DISPLAY_FLAGS_SYNC_POSEDGE : |
| 98 | DISPLAY_FLAGS_SYNC_NEGEDGE; |
| 99 | |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 100 | if (of_property_read_bool(np, "interlaced")) |
Tomi Valkeinen | 06a3307 | 2013-03-12 10:26:45 +0200 | [diff] [blame] | 101 | dt->flags |= DISPLAY_FLAGS_INTERLACED; |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 102 | if (of_property_read_bool(np, "doublescan")) |
Tomi Valkeinen | 06a3307 | 2013-03-12 10:26:45 +0200 | [diff] [blame] | 103 | dt->flags |= DISPLAY_FLAGS_DOUBLESCAN; |
Steffen Trumtrar | 2d178a4 | 2013-05-27 12:33:34 +0000 | [diff] [blame] | 104 | if (of_property_read_bool(np, "doubleclk")) |
| 105 | dt->flags |= DISPLAY_FLAGS_DOUBLECLK; |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 106 | |
| 107 | if (ret) { |
| 108 | pr_err("%s: error reading timing properties\n", |
| 109 | of_node_full_name(np)); |
Tomi Valkeinen | fcf7e6e | 2013-05-16 15:29:06 +0300 | [diff] [blame] | 110 | return -EINVAL; |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 111 | } |
| 112 | |
Tomi Valkeinen | fcf7e6e | 2013-05-16 15:29:06 +0300 | [diff] [blame] | 113 | return 0; |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | /** |
Tomi Valkeinen | ffa3fd2 | 2013-05-16 15:36:38 +0300 | [diff] [blame] | 117 | * of_get_display_timing - parse a display_timing entry |
| 118 | * @np: device_node with the timing subnode |
| 119 | * @name: name of the timing node |
| 120 | * @dt: display_timing struct to fill |
| 121 | **/ |
Laurent Pinchart | f5a000c | 2016-10-03 16:55:48 +0300 | [diff] [blame] | 122 | int of_get_display_timing(const struct device_node *np, const char *name, |
Tomi Valkeinen | ffa3fd2 | 2013-05-16 15:36:38 +0300 | [diff] [blame] | 123 | struct display_timing *dt) |
| 124 | { |
| 125 | struct device_node *timing_np; |
| 126 | |
Lucas Stach | dc42715 | 2014-05-13 14:58:21 +0200 | [diff] [blame] | 127 | if (!np) |
Tomi Valkeinen | ffa3fd2 | 2013-05-16 15:36:38 +0300 | [diff] [blame] | 128 | return -EINVAL; |
Tomi Valkeinen | ffa3fd2 | 2013-05-16 15:36:38 +0300 | [diff] [blame] | 129 | |
Andrzej Hajda | 60119a1 | 2013-09-25 13:51:31 +0200 | [diff] [blame] | 130 | timing_np = of_get_child_by_name(np, name); |
Tomi Valkeinen | ffa3fd2 | 2013-05-16 15:36:38 +0300 | [diff] [blame] | 131 | if (!timing_np) { |
| 132 | pr_err("%s: could not find node '%s'\n", |
| 133 | of_node_full_name(np), name); |
| 134 | return -ENOENT; |
| 135 | } |
| 136 | |
| 137 | return of_parse_display_timing(timing_np, dt); |
| 138 | } |
| 139 | EXPORT_SYMBOL_GPL(of_get_display_timing); |
| 140 | |
| 141 | /** |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 142 | * of_get_display_timings - parse all display_timing entries from a device_node |
| 143 | * @np: device_node with the subnodes |
| 144 | **/ |
Laurent Pinchart | f5a000c | 2016-10-03 16:55:48 +0300 | [diff] [blame] | 145 | struct display_timings *of_get_display_timings(const struct device_node *np) |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 146 | { |
| 147 | struct device_node *timings_np; |
| 148 | struct device_node *entry; |
| 149 | struct device_node *native_mode; |
| 150 | struct display_timings *disp; |
| 151 | |
Lucas Stach | dc42715 | 2014-05-13 14:58:21 +0200 | [diff] [blame] | 152 | if (!np) |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 153 | return NULL; |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 154 | |
Andrzej Hajda | 60119a1 | 2013-09-25 13:51:31 +0200 | [diff] [blame] | 155 | timings_np = of_get_child_by_name(np, "display-timings"); |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 156 | if (!timings_np) { |
| 157 | pr_err("%s: could not find display-timings node\n", |
| 158 | of_node_full_name(np)); |
| 159 | return NULL; |
| 160 | } |
| 161 | |
| 162 | disp = kzalloc(sizeof(*disp), GFP_KERNEL); |
| 163 | if (!disp) { |
| 164 | pr_err("%s: could not allocate struct disp'\n", |
| 165 | of_node_full_name(np)); |
| 166 | goto dispfail; |
| 167 | } |
| 168 | |
| 169 | entry = of_parse_phandle(timings_np, "native-mode", 0); |
| 170 | /* assume first child as native mode if none provided */ |
| 171 | if (!entry) |
Boris BREZILLON | 80c68c1 | 2014-05-09 15:53:12 +0200 | [diff] [blame] | 172 | entry = of_get_next_child(timings_np, NULL); |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 173 | /* if there is no child, it is useless to go on */ |
| 174 | if (!entry) { |
| 175 | pr_err("%s: no timing specifications given\n", |
| 176 | of_node_full_name(np)); |
| 177 | goto entryfail; |
| 178 | } |
| 179 | |
| 180 | pr_debug("%s: using %s as default timing\n", |
| 181 | of_node_full_name(np), entry->name); |
| 182 | |
| 183 | native_mode = entry; |
| 184 | |
| 185 | disp->num_timings = of_get_child_count(timings_np); |
| 186 | if (disp->num_timings == 0) { |
| 187 | /* should never happen, as entry was already found above */ |
| 188 | pr_err("%s: no timings specified\n", of_node_full_name(np)); |
| 189 | goto entryfail; |
| 190 | } |
| 191 | |
| 192 | disp->timings = kzalloc(sizeof(struct display_timing *) * |
| 193 | disp->num_timings, GFP_KERNEL); |
| 194 | if (!disp->timings) { |
| 195 | pr_err("%s: could not allocate timings array\n", |
| 196 | of_node_full_name(np)); |
| 197 | goto entryfail; |
| 198 | } |
| 199 | |
| 200 | disp->num_timings = 0; |
| 201 | disp->native_mode = 0; |
| 202 | |
| 203 | for_each_child_of_node(timings_np, entry) { |
| 204 | struct display_timing *dt; |
Tomi Valkeinen | fcf7e6e | 2013-05-16 15:29:06 +0300 | [diff] [blame] | 205 | int r; |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 206 | |
Tomi Valkeinen | fcf7e6e | 2013-05-16 15:29:06 +0300 | [diff] [blame] | 207 | dt = kzalloc(sizeof(*dt), GFP_KERNEL); |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 208 | if (!dt) { |
Tomi Valkeinen | fcf7e6e | 2013-05-16 15:29:06 +0300 | [diff] [blame] | 209 | pr_err("%s: could not allocate display_timing struct\n", |
| 210 | of_node_full_name(np)); |
| 211 | goto timingfail; |
| 212 | } |
| 213 | |
Tomi Valkeinen | ffa3fd2 | 2013-05-16 15:36:38 +0300 | [diff] [blame] | 214 | r = of_parse_display_timing(entry, dt); |
Tomi Valkeinen | fcf7e6e | 2013-05-16 15:29:06 +0300 | [diff] [blame] | 215 | if (r) { |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 216 | /* |
| 217 | * to not encourage wrong devicetrees, fail in case of |
| 218 | * an error |
| 219 | */ |
| 220 | pr_err("%s: error in timing %d\n", |
| 221 | of_node_full_name(np), disp->num_timings + 1); |
Sudip Mukherjee | d663bab | 2015-09-30 15:24:08 +0530 | [diff] [blame] | 222 | kfree(dt); |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 223 | goto timingfail; |
| 224 | } |
| 225 | |
| 226 | if (native_mode == entry) |
| 227 | disp->native_mode = disp->num_timings; |
| 228 | |
| 229 | disp->timings[disp->num_timings] = dt; |
| 230 | disp->num_timings++; |
| 231 | } |
| 232 | of_node_put(timings_np); |
| 233 | /* |
| 234 | * native_mode points to the device_node returned by of_parse_phandle |
| 235 | * therefore call of_node_put on it |
| 236 | */ |
| 237 | of_node_put(native_mode); |
| 238 | |
| 239 | pr_debug("%s: got %d timings. Using timing #%d as default\n", |
| 240 | of_node_full_name(np), disp->num_timings, |
| 241 | disp->native_mode + 1); |
| 242 | |
| 243 | return disp; |
| 244 | |
| 245 | timingfail: |
Julia Lawall | 68ecfe2 | 2014-08-08 12:07:55 +0200 | [diff] [blame] | 246 | of_node_put(native_mode); |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 247 | display_timings_release(disp); |
Dan Carpenter | 62795a0 | 2014-07-11 12:21:36 +0300 | [diff] [blame] | 248 | disp = NULL; |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 249 | entryfail: |
| 250 | kfree(disp); |
| 251 | dispfail: |
| 252 | of_node_put(timings_np); |
| 253 | return NULL; |
| 254 | } |
| 255 | EXPORT_SYMBOL_GPL(of_get_display_timings); |
| 256 | |
| 257 | /** |
| 258 | * of_display_timings_exist - check if a display-timings node is provided |
| 259 | * @np: device_node with the timing |
| 260 | **/ |
Laurent Pinchart | f5a000c | 2016-10-03 16:55:48 +0300 | [diff] [blame] | 261 | int of_display_timings_exist(const struct device_node *np) |
Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 262 | { |
| 263 | struct device_node *timings_np; |
| 264 | |
| 265 | if (!np) |
| 266 | return -EINVAL; |
| 267 | |
| 268 | timings_np = of_parse_phandle(np, "display-timings", 0); |
| 269 | if (!timings_np) |
| 270 | return -EINVAL; |
| 271 | |
| 272 | of_node_put(timings_np); |
| 273 | return 1; |
| 274 | } |
| 275 | EXPORT_SYMBOL_GPL(of_display_timings_exist); |