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); |
52 |