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 <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 */
  17struct gdsys_soc_priv {
  18        struct udevice *fpga;
  19};
  20
  21static const struct udevice_id gdsys_soc_ids[] = {
  22        { .compatible = "gdsys,soc" },
  23        { /* sentinel */ }
  24};
  25
  26int 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
  47static 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
  68U_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};
  75