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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * generic videomode helper4 *5 * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix6 */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 devicetree17 * @np: devicenode with the display_timings18 * @vm: set to return value19 * @index: index into list of display_timings20 * (Set this to OF_USE_NATIVE_MODE to use whatever mode is21 * specified as native mode in the DT.)22 *23 * DESCRIPTION:24 * Get a list of all display timings and put the one25 * specified by index into *vm. This function should only be used, if26 * only one videomode is to be retrieved. A driver that needs to work27 * with multiple/all videomodes should work with28 * of_get_display_timings instead.29 **/30int 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}51EXPORT_SYMBOL_GPL(of_get_videomode);52