1 /* 2 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/ 3 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 */ 14 15 #include <linux/device.h> 16 #include <linux/err.h> 17 #include <linux/module.h> 18 #include <linux/of.h> 19 #include <linux/of_graph.h> 20 #include <linux/seq_file.h> 21 22 #include "omapdss.h" 23 dss_of_port_get_parent_device(struct device_node * port)24struct device_node *dss_of_port_get_parent_device(struct device_node *port) 25 { 26 struct device_node *np; 27 int i; 28 29 if (!port) 30 return NULL; 31 32 np = of_get_parent(port); 33 34 for (i = 0; i < 2 && np; ++i) { 35 struct property *prop; 36 37 prop = of_find_property(np, "compatible", NULL); 38 39 if (prop) 40 return np; 41 42 np = of_get_next_parent(np); 43 } 44 45 return NULL; 46 } 47 dss_of_port_get_port_number(struct device_node * port)48u32 dss_of_port_get_port_number(struct device_node *port) 49 { 50 int r; 51 u32 reg; 52 53 r = of_property_read_u32(port, "reg", ®); 54 if (r) 55 reg = 0; 56 57 return reg; 58 } 59 60 struct omap_dss_device * omapdss_of_find_source_for_first_ep(struct device_node * node)61omapdss_of_find_source_for_first_ep(struct device_node *node) 62 { 63 struct device_node *ep; 64 struct device_node *src_port; 65 struct omap_dss_device *src; 66 67 ep = of_graph_get_endpoint_by_regs(node, 0, 0); 68 if (!ep) 69 return ERR_PTR(-EINVAL); 70 71 src_port = of_graph_get_remote_port(ep); 72 if (!src_port) { 73 of_node_put(ep); 74 return ERR_PTR(-EINVAL); 75 } 76 77 of_node_put(ep); 78 79 src = omap_dss_find_output_by_port_node(src_port); 80 81 of_node_put(src_port); 82 83 return src ? src : ERR_PTR(-EPROBE_DEFER); 84 } 85 EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep); 86