1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * generic videomode helper
4 *
5 * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
6 */
7 #include <linux/errno.h>
8 #include <linux/export.h>
9 #include <linux/of.h>
10 #include <video/display_timing.h>
11 #include <video/of_display_timing.h>
12 #include <video/of_videomode.h>
13 #include <video/videomode.h>
14
15 /**
16 * of_get_videomode - get the videomode #<index> from devicetree
17 * @np - devicenode with the display_timings
18 * @vm - set to return value
19 * @index - index into list of display_timings
20 * (Set this to OF_USE_NATIVE_MODE to use whatever mode is
21 * specified as native mode in the DT.)
22 *
23 * DESCRIPTION:
24 * Get a list of all display timings and put the one
25 * specified by index into *vm. This function should only be used, if
26 * only one videomode is to be retrieved. A driver that needs to work
27 * with multiple/all videomodes should work with
28 * of_get_display_timings instead.
29 **/
30 int of_get_videomode(struct device_node *np, struct videomode *vm,
31 int index)
32 {
33 struct display_timings *disp;
34 int ret;
35
36 disp = of_get_display_timings(np);
37 if (!disp) {
38 pr_err("%pOF: no timings specified\n", np);
39 return -EINVAL;
40 }
41
42 if (index == OF_USE_NATIVE_MODE)
43 index = disp->native_mode;
44
45 ret = videomode_from_timings(disp, vm, index);
46
47 display_timings_release(disp);
48
49 return ret;
50 }
51 EXPORT_SYMBOL_GPL(of_get_videomode);