LXR linux/drivers/video/of

   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 **/
  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