drivers/misc/gdsys_soc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2017
   4  * Mario Six,  Guntermann & Drunck GmbH, mario.six@gdsys.cc
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <dm/lists.h>
  10
  11 #include "gdsys_soc.h"
  12
  13 /**
  14  * struct gdsys_soc_priv - Private data for gdsys soc bus
  15  * @fpga: The gdsys IHS FPGA this bus is associated with
  16  */
  17 struct gdsys_soc_priv {
  18         struct udevice *fpga;
  19 };
  20
  21 static const struct udevice_id gdsys_soc_ids[] = {
  22         { .compatible = "gdsys,soc" },
  23         { /* sentinel */ }
  24 };
  25
  26 int gdsys_soc_get_fpga(struct udevice *child, struct udevice **fpga)
  27 {
  28         struct gdsys_soc_priv *bus_priv;
  29
  30         if (!child->parent) {
  31                 debug("%s: Invalid parent\n", child->name);
  32                 return -EINVAL;
  33         }
  34
  35         if (!device_is_compatible(child->parent, "gdsys,soc")) {
  36                 debug("%s: Not child of a gdsys soc\n", child->name);
  37                 return -EINVAL;
  38         }
  39
  40         bus_priv = dev_get_priv(child->parent);
  41
  42         *fpga = bus_priv->fpga;
  43
  44         return 0;
  45 }
  46
  47 static int gdsys_soc_probe(struct udevice *dev)
  48 {
  49         struct gdsys_soc_priv *priv = dev_get_priv(dev);
  50         struct udevice *fpga;
  51         int res = uclass_get_device_by_phandle(UCLASS_MISC, dev, "fpga",
  52                                                &fpga);
  53         if (res == -ENOENT) {
  54                 debug("%s: Could not find 'fpga' phandle\n", dev->name);
  55                 return -EINVAL;
  56         }
  57
  58         if (res == -ENODEV) {
  59                 debug("%s: Could not get FPGA device\n", dev->name);
  60                 return -EINVAL;
  61         }
  62
  63         priv->fpga = fpga;
  64
  65         return 0;
  66 }
  67
  68 U_BOOT_DRIVER(gdsys_soc_bus) = {
  69         .name           = "gdsys_soc_bus",
  70         .id             = UCLASS_SIMPLE_BUS,
  71         .of_match       = gdsys_soc_ids,
  72         .probe          = gdsys_soc_probe,
  73         .priv_auto_alloc_size = sizeof(struct gdsys_soc_priv),
  74 };