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 **/ of_get_videomode(struct device_node * np,struct videomode * vm,int index)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 } 51 EXPORT_SYMBOL_GPL(of_get_videomode); 52