drivers/video/fbdev/omap2/omapfb/dss/dss-of.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Texas Instruments
   4  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   5  */
   6
   7 #include <linux/device.h>
   8 #include <linux/err.h>
   9 #include <linux/module.h>
  10 #include <linux/of.h>
  11 #include <linux/of_graph.h>
  12 #include <linux/seq_file.h>
  13
  14 #include <video/omapfb_dss.h>
  15
  16 #include "dss.h"
  17
  18 struct device_node *dss_of_port_get_parent_device(struct device_node *port)
  19 {
  20         struct device_node *np;
  21         int i;
  22
  23         if (!port)
  24                 return NULL;
  25
  26         np = of_get_parent(port);
  27
  28         for (i = 0; i < 2 && np; ++i) {
  29                 struct property *prop;
  30
  31                 prop = of_find_property(np, "compatible", NULL);
  32
  33                 if (prop)
  34                         return np;
  35
  36                 np = of_get_next_parent(np);
  37         }
  38
  39         return NULL;
  40 }
  41
  42 u32 dss_of_port_get_port_number(struct device_node *port)
  43 {
  44         int r;
  45         u32 reg;
  46
  47         r = of_property_read_u32(port, "reg", &reg);
  48         if (r)
  49                 reg = 0;
  50
  51         return reg;
  52 }
  53
  54 struct omap_dss_device *
  55 omapdss_of_find_source_for_first_ep(struct device_node *node)
  56 {
  57         struct device_node *ep;
  58         struct device_node *src_port;
  59         struct omap_dss_device *src;
  60
  61         ep = of_graph_get_endpoint_by_regs(node, 0, -1);
  62         if (!ep)
  63                 return ERR_PTR(-EINVAL);
  64
  65         src_port = of_graph_get_remote_port(ep);
  66         of_node_put(ep);
  67         if (!src_port)
  68                 return ERR_PTR(-EINVAL);
  69
  70         src = omap_dss_find_output_by_port_node(src_port);
  71
  72         of_node_put(src_port);
  73
  74         return src ? src : ERR_PTR(-EPROBE_DEFER);
  75 }
  76 EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);