xref: /openbmc/linux/drivers/usb/phy/of.c (revision 12eb4683)
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 correspondig 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);
48