LXR uboot/drivers/misc/gdsys

   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 <log.h>
  10#include <dm/lists.h>
  11
  12#include "gdsys_soc.h"
  13
  14/**
  15 * struct gdsys_soc_priv - Private data for gdsys soc bus
  16 * @fpga: The gdsys IHS FPGA this bus is associated with
  17 */
  18struct gdsys_soc_priv {
  19        struct udevice *fpga;
  20};
  21
  22static const struct udevice_id gdsys_soc_ids[] = {
  23        { .compatible = "gdsys,soc" },
  24        { /* sentinel */ }
  25};
  26
  27int gdsys_soc_get_fpga(struct udevice *child, struct udevice **fpga)
  28{
  29        struct gdsys_soc_priv *bus_priv;
  30
  31        if (!child->parent) {
  32                debug("%s: Invalid parent\n", child->name);
  33                return -EINVAL;
  34        }
  35
  36        if (!device_is_compatible(child->parent, "gdsys,soc")) {
  37                debug("%s: Not child of a gdsys soc\n", child->name);
  38                return -EINVAL;
  39        }
  40
  41        bus_priv = dev_get_priv(child->parent);
  42
  43        *fpga = bus_priv->fpga;
  44
  45        return 0;
  46}
  47
  48static int gdsys_soc_probe(struct udevice *dev)
  49{
  50        struct gdsys_soc_priv *priv = dev_get_priv(dev);
  51        struct udevice *fpga;
  52        int res = uclass_get_device_by_phandle(UCLASS_MISC, dev, "fpga",
  53                                               &fpga);
  54        if (res == -ENOENT) {
  55                debug("%s: Could not find 'fpga' phandle\n", dev->name);
  56                return -EINVAL;
  57        }
  58
  59        if (res == -ENODEV) {
  60                debug("%s: Could not get FPGA device\n", dev->name);
  61                return -EINVAL;
  62        }
  63
  64        priv->fpga = fpga;
  65
  66        return 0;
  67}
  68
  69U_BOOT_DRIVER(gdsys_soc_bus) = {
  70        .name           = "gdsys_soc_bus",
  71        .id             = UCLASS_SIMPLE_BUS,
  72        .of_match       = gdsys_soc_ids,
  73        .probe          = gdsys_soc_probe,
  74        .priv_auto      = sizeof(struct gdsys_soc_priv),
  75};
  76