1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * USB of helper code 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/usb/of.h> 15 #include <linux/usb/otg.h> 16 17 static const char *const usbphy_modes[] = { 18 [USBPHY_INTERFACE_MODE_UNKNOWN] = "", 19 [USBPHY_INTERFACE_MODE_UTMI] = "utmi", 20 [USBPHY_INTERFACE_MODE_UTMIW] = "utmi_wide", 21 [USBPHY_INTERFACE_MODE_ULPI] = "ulpi", 22 [USBPHY_INTERFACE_MODE_SERIAL] = "serial", 23 [USBPHY_INTERFACE_MODE_HSIC] = "hsic", 24 }; 25 26 /** 27 * of_usb_get_phy_mode - Get phy mode for given device_node 28 * @np: Pointer to the given device_node 29 * 30 * The function gets phy interface string from property 'phy_type', 31 * and returns the corresponding enum usb_phy_interface 32 */ 33 enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np) 34 { 35 const char *phy_type; 36 int err, i; 37 38 err = of_property_read_string(np, "phy_type", &phy_type); 39 if (err < 0) 40 return USBPHY_INTERFACE_MODE_UNKNOWN; 41 42 for (i = 0; i < ARRAY_SIZE(usbphy_modes); i++) 43 if (!strcmp(phy_type, usbphy_modes[i])) 44 return i; 45 46 return USBPHY_INTERFACE_MODE_UNKNOWN; 47 } 48 EXPORT_SYMBOL_GPL(of_usb_get_phy_mode); 49