drivers/usb/phy/of.c

   1 /*
   2  * USB of helper code
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/usb/of.h>
  14 #include <linux/usb/otg.h>
  15
  16 static const char *const usbphy_modes[] = {
  17         [USBPHY_INTERFACE_MODE_UNKNOWN] = "",
  18         [USBPHY_INTERFACE_MODE_UTMI]    = "utmi",
  19         [USBPHY_INTERFACE_MODE_UTMIW]   = "utmi_wide",
  20         [USBPHY_INTERFACE_MODE_ULPI]    = "ulpi",
  21         [USBPHY_INTERFACE_MODE_SERIAL]  = "serial",
  22         [USBPHY_INTERFACE_MODE_HSIC]    = "hsic",
  23 };
  24
  25 /**
  26  * of_usb_get_phy_mode - Get phy mode for given device_node
  27  * @np: Pointer to the given device_node
  28  *
  29  * The function gets phy interface string from property 'phy_type',
  30  * and returns the corresponding enum usb_phy_interface
  31  */
  32 enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np)
  33 {
  34         const char *phy_type;
  35         int err, i;
  36
  37         err = of_property_read_string(np, "phy_type", &phy_type);
  38         if (err < 0)
  39                 return USBPHY_INTERFACE_MODE_UNKNOWN;
  40
  41         for (i = 0; i < ARRAY_SIZE(usbphy_modes); i++)
  42                 if (!strcmp(phy_type, usbphy_modes[i]))
  43                         return i;
  44
  45         return USBPHY_INTERFACE_MODE_UNKNOWN;
  46 }
  47 EXPORT_SYMBOL_GPL(of_usb_get_phy_mode);