mirror of https://gitee.com/openkylin/linux.git
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/*
|
|
* generic videomode helper
|
|
*
|
|
* Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
|
|
*
|
|
* This file is released under the GPLv2
|
|
*/
|
|
#include <linux/errno.h>
|
|
#include <linux/export.h>
|
|
#include <linux/of.h>
|
|
#include <video/display_timing.h>
|
|
#include <video/of_display_timing.h>
|
|
#include <video/of_videomode.h>
|
|
#include <video/videomode.h>
|
|
|
|
/**
|
|
* of_get_videomode - get the videomode #<index> from devicetree
|
|
* @np - devicenode with the display_timings
|
|
* @vm - set to return value
|
|
* @index - index into list of display_timings
|
|
* (Set this to OF_USE_NATIVE_MODE to use whatever mode is
|
|
* specified as native mode in the DT.)
|
|
*
|
|
* DESCRIPTION:
|
|
* Get a list of all display timings and put the one
|
|
* specified by index into *vm. This function should only be used, if
|
|
* only one videomode is to be retrieved. A driver that needs to work
|
|
* with multiple/all videomodes should work with
|
|
* of_get_display_timings instead.
|
|
**/
|
|
int of_get_videomode(struct device_node *np, struct videomode *vm,
|
|
int index)
|
|
{
|
|
struct display_timings *disp;
|
|
int ret;
|
|
|
|
disp = of_get_display_timings(np);
|
|
if (!disp) {
|
|
pr_err("%s: no timings specified\n", of_node_full_name(np));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (index == OF_USE_NATIVE_MODE)
|
|
index = disp->native_mode;
|
|
|
|
ret = videomode_from_timings(disp, vm, index);
|
|
if (ret)
|
|
return ret;
|
|
|
|
display_timings_release(disp);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_get_videomode);
|