drivers/usb/common/common.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Provides code common for host and device side USB.
   4  *
   5  * (C) Copyright 2016
   6  *     Texas Instruments Incorporated, <www.ti.com>
   7  */
   8
   9 #include <common.h>
  10 #include <linux/libfdt.h>
  11 #include <linux/usb/otg.h>
  12
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 static const char *const usb_dr_modes[] = {
  16         [USB_DR_MODE_UNKNOWN]           = "",
  17         [USB_DR_MODE_HOST]              = "host",
  18         [USB_DR_MODE_PERIPHERAL]        = "peripheral",
  19         [USB_DR_MODE_OTG]               = "otg",
  20 };
  21
  22 enum usb_dr_mode usb_get_dr_mode(int node)
  23 {
  24         const void *fdt = gd->fdt_blob;
  25         const char *dr_mode;
  26         int i;
  27
  28         dr_mode = fdt_getprop(fdt, node, "dr_mode", NULL);
  29         if (!dr_mode) {
  30                 pr_err("usb dr_mode not found\n");
  31                 return USB_DR_MODE_UNKNOWN;
  32         }
  33
  34         for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
  35                 if (!strcmp(dr_mode, usb_dr_modes[i]))
  36                         return i;
  37
  38         return USB_DR_MODE_UNKNOWN;
  39 }