1 /* 2 * generic videomode helper 3 * 4 * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix 5 * 6 * This file is released under the GPLv2 7 */ 8 #include <linux/errno.h> 9 #include <linux/export.h> 10 #include <linux/of.h> 11 #include <video/display_timing.h> 12 #include <video/of_display_timing.h> 13 #include <video/of_videomode.h> 14 #include <video/videomode.h> 15 16 /** 17 * of_get_videomode - get the videomode #<index> from devicetree 18 * @np - devicenode with the display_timings 19 * @vm - set to return value 20 * @index - index into list of display_timings 21 * (Set this to OF_USE_NATIVE_MODE to use whatever mode is 22 * specified as native mode in the DT.) 23 * 24 * DESCRIPTION: 25 * Get a list of all display timings and put the one 26 * specified by index into *vm. This function should only be used, if 27 * only one videomode is to be retrieved. A driver that needs to work 28 * with multiple/all videomodes should work with 29 * of_get_display_timings instead. 30 **/ 31 int of_get_videomode(struct device_node *np, struct videomode *vm, 32 int index) 33 { 34 struct display_timings *disp; 35 int ret; 36 37 disp = of_get_display_timings(np); 38 if (!disp) { 39 pr_err("%s: no timings specified\n", of_node_full_name(np)); 40 return -EINVAL; 41 } 42 43 if (index == OF_USE_NATIVE_MODE) 44 index = disp->native_mode; 45 46 ret = videomode_from_timings(disp, vm, index); 47 48 display_timings_release(disp); 49 50 return ret; 51 } 52 EXPORT_SYMBOL_GPL(of_get_videomode); 53