1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * generic videomode helper 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun #include <linux/errno.h> 8*4882a593Smuzhiyun #include <linux/export.h> 9*4882a593Smuzhiyun #include <linux/of.h> 10*4882a593Smuzhiyun #include <video/display_timing.h> 11*4882a593Smuzhiyun #include <video/of_display_timing.h> 12*4882a593Smuzhiyun #include <video/of_videomode.h> 13*4882a593Smuzhiyun #include <video/videomode.h> 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun /** 16*4882a593Smuzhiyun * of_get_videomode - get the videomode #<index> from devicetree 17*4882a593Smuzhiyun * @np - devicenode with the display_timings 18*4882a593Smuzhiyun * @vm - set to return value 19*4882a593Smuzhiyun * @index - index into list of display_timings 20*4882a593Smuzhiyun * (Set this to OF_USE_NATIVE_MODE to use whatever mode is 21*4882a593Smuzhiyun * specified as native mode in the DT.) 22*4882a593Smuzhiyun * 23*4882a593Smuzhiyun * DESCRIPTION: 24*4882a593Smuzhiyun * Get a list of all display timings and put the one 25*4882a593Smuzhiyun * specified by index into *vm. This function should only be used, if 26*4882a593Smuzhiyun * only one videomode is to be retrieved. A driver that needs to work 27*4882a593Smuzhiyun * with multiple/all videomodes should work with 28*4882a593Smuzhiyun * of_get_display_timings instead. 29*4882a593Smuzhiyun **/ of_get_videomode(struct device_node * np,struct videomode * vm,int index)30*4882a593Smuzhiyunint of_get_videomode(struct device_node *np, struct videomode *vm, 31*4882a593Smuzhiyun int index) 32*4882a593Smuzhiyun { 33*4882a593Smuzhiyun struct display_timings *disp; 34*4882a593Smuzhiyun int ret; 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun disp = of_get_display_timings(np); 37*4882a593Smuzhiyun if (!disp) { 38*4882a593Smuzhiyun pr_err("%pOF: no timings specified\n", np); 39*4882a593Smuzhiyun return -EINVAL; 40*4882a593Smuzhiyun } 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun if (index == OF_USE_NATIVE_MODE) 43*4882a593Smuzhiyun index = disp->native_mode; 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun ret = videomode_from_timings(disp, vm, index); 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun display_timings_release(disp); 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun return ret; 50*4882a593Smuzhiyun } 51*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(of_get_videomode); 52