drivers/usb/phy/of.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * USB of helper code
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/of.h>
   9 #include <linux/usb/of.h>
  10 #include <linux/usb/otg.h>
  11
  12 static const char *const usbphy_modes[] = {
  13         [USBPHY_INTERFACE_MODE_UNKNOWN] = "",
  14         [USBPHY_INTERFACE_MODE_UTMI]    = "utmi",
  15         [USBPHY_INTERFACE_MODE_UTMIW]   = "utmi_wide",
  16         [USBPHY_INTERFACE_MODE_ULPI]    = "ulpi",
  17         [USBPHY_INTERFACE_MODE_SERIAL]  = "serial",
  18         [USBPHY_INTERFACE_MODE_HSIC]    = "hsic",
  19 };
  20
  21 /**
  22  * of_usb_get_phy_mode - Get phy mode for given device_node
  23  * @np: Pointer to the given device_node
  24  *
  25  * The function gets phy interface string from property 'phy_type',
  26  * and returns the corresponding enum usb_phy_interface
  27  */
  28 enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np)
  29 {
  30         const char *phy_type;
  31         int err, i;
  32
  33         err = of_property_read_string(np, "phy_type", &phy_type);
  34         if (err < 0)
  35                 return USBPHY_INTERFACE_MODE_UNKNOWN;
  36
  37         for (i = 0; i < ARRAY_SIZE(usbphy_modes); i++)
  38                 if (!strcmp(phy_type, usbphy_modes[i]))
  39                         return i;
  40
  41         return USBPHY_INTERFACE_MODE_UNKNOWN;
  42 }
  43 EXPORT_SYMBOL_GPL(of_usb_get_phy_mode);