drivers/usb/host/dwc3-of-simple.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * dwc3-of-simple.c - OF glue layer for simple integrations
   4  *
   5  * Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com
   6  *
   7  * Author: Felipe Balbi <balbi@ti.com>
   8  *
   9  * Copyright (C) 2018 BayLibre, SAS
  10  * Author: Neil Armstrong <narmstron@baylibre.com>
  11  */
  12
  13 #include <common.h>
  14 #include <dm.h>
  15 #include <reset.h>
  16 #include <clk.h>
  17
  18 struct dwc3_of_simple {
  19         struct clk_bulk         clks;
  20         struct reset_ctl_bulk   resets;
  21 };
  22
  23 static int dwc3_of_simple_reset_init(struct udevice *dev,
  24                                      struct dwc3_of_simple *simple)
  25 {
  26         int ret;
  27
  28         ret = reset_get_bulk(dev, &simple->resets);
  29         if (ret == -ENOTSUPP)
  30                 return 0;
  31         else if (ret)
  32                 return ret;
  33
  34         ret = reset_deassert_bulk(&simple->resets);
  35         if (ret) {
  36                 reset_release_bulk(&simple->resets);
  37                 return ret;
  38         }
  39
  40         return 0;
  41 }
  42
  43 static int dwc3_of_simple_clk_init(struct udevice *dev,
  44                                    struct dwc3_of_simple *simple)
  45 {
  46         int ret;
  47
  48         ret = clk_get_bulk(dev, &simple->clks);
  49         if (ret == -ENOSYS)
  50                 return 0;
  51         if (ret)
  52                 return ret;
  53
  54 #if CONFIG_IS_ENABLED(CLK)
  55         ret = clk_enable_bulk(&simple->clks);
  56         if (ret) {
  57                 clk_release_bulk(&simple->clks);
  58                 return ret;
  59         }
  60 #endif
  61
  62         return 0;
  63 }
  64
  65 static int dwc3_of_simple_probe(struct udevice *dev)
  66 {
  67         struct dwc3_of_simple *simple = dev_get_platdata(dev);
  68         int ret;
  69
  70         ret = dwc3_of_simple_clk_init(dev, simple);
  71         if (ret)
  72                 return ret;
  73
  74         ret = dwc3_of_simple_reset_init(dev, simple);
  75         if (ret)
  76                 return ret;
  77
  78         return 0;
  79 }
  80
  81 static int dwc3_of_simple_remove(struct udevice *dev)
  82 {
  83         struct dwc3_of_simple *simple = dev_get_platdata(dev);
  84
  85         reset_release_bulk(&simple->resets);
  86
  87         clk_release_bulk(&simple->clks);
  88
  89         return dm_scan_fdt_dev(dev);
  90 }
  91
  92 static const struct udevice_id dwc3_of_simple_ids[] = {
  93         { .compatible = "amlogic,meson-gxl-dwc3" },
  94         { .compatible = "rockchip,rk3399-dwc3" },
  95         { .compatible = "ti,dwc3" },
  96         { }
  97 };
  98
  99 U_BOOT_DRIVER(dwc3_of_simple) = {
 100         .name = "dwc3-of-simple",
 101         .id = UCLASS_SIMPLE_BUS,
 102         .of_match = dwc3_of_simple_ids,
 103         .probe = dwc3_of_simple_probe,
 104         .remove = dwc3_of_simple_remove,
 105         .platdata_auto_alloc_size = sizeof(struct dwc3_of_simple),
 106         .flags = DM_FLAG_ALLOC_PRIV_DMA,
 107 };