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55716d26 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
cc3f414c ST |
2 | /* |
3 | * generic videomode helper | |
4 | * | |
5 | * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix | |
cc3f414c ST |
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 | |
89194896 SR |
17 | * @np: devicenode with the display_timings |
18 | * @vm: set to return value | |
19 | * @index: index into list of display_timings | |
cc3f414c ST |
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) { | |
6d7e6533 | 38 | pr_err("%pOF: no timings specified\n", np); |
cc3f414c ST |
39 | return -EINVAL; |
40 | } | |
41 | ||
42 | if (index == OF_USE_NATIVE_MODE) | |
43 | index = disp->native_mode; | |
44 | ||
6cd2c7db | 45 | ret = videomode_from_timings(disp, vm, index); |
cc3f414c ST |
46 | |
47 | display_timings_release(disp); | |
48 | ||
37b617f9 | 49 | return ret; |
cc3f414c ST |
50 | } |
51 | EXPORT_SYMBOL_GPL(of_get_videomode); |