usb: Add devicetree helpers

Add helpers to get the dr_mode and the phy_mode.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/usb/core/Makefile

@@ -1,2 +1,3 @@
 
 obj-y += usb.o
+obj-$(CONFIG_OFDEVICE) += of.o

drivers/usb/core/of.c

@@ -0,0 +1,91 @@
+/*
+ * usb devicetree helper functions
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <common.h>
+#include <usb/usb.h>
+#include <of.h>
+
+static const char *usb_dr_modes[] = {
+	[USB_DR_MODE_UNKNOWN]		= "",
+	[USB_DR_MODE_HOST]		= "host",
+	[USB_DR_MODE_PERIPHERAL]	= "peripheral",
+	[USB_DR_MODE_OTG]		= "otg",
+};
+
+/**
+ * of_usb_get_dr_mode - Get dual role mode for given device_node
+ * @np:	Pointer to the given device_node
+ *
+ * The function gets phy interface string from property 'dr_mode',
+ * and returns the correspondig enum usb_dr_mode
+ */
+enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np,
+		const char *propname)
+{
+	const char *dr_mode;
+	int err, i;
+
+	if (!propname)
+		propname = "barebox,dr_mode";
+
+	err = of_property_read_string(np, propname, &dr_mode);
+	if (err < 0)
+		return USB_DR_MODE_UNKNOWN;
+
+	for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
+		if (!strcmp(dr_mode, usb_dr_modes[i]))
+			return i;
+
+	return USB_DR_MODE_UNKNOWN;
+}
+EXPORT_SYMBOL_GPL(of_usb_get_dr_mode);
+
+static const char *usbphy_modes[] = {
+	[USBPHY_INTERFACE_MODE_UNKNOWN]	= "",
+	[USBPHY_INTERFACE_MODE_UTMI]	= "utmi",
+	[USBPHY_INTERFACE_MODE_UTMIW]	= "utmi_wide",
+	[USBPHY_INTERFACE_MODE_ULPI]	= "ulpi",
+	[USBPHY_INTERFACE_MODE_SERIAL]	= "serial",
+	[USBPHY_INTERFACE_MODE_HSIC]	= "hsic",
+};
+
+/**
+ * of_usb_get_phy_mode - Get phy mode for given device_node
+ * @np:	Pointer to the given device_node
+ *
+ * The function gets phy interface string from property 'phy_type',
+ * and returns the correspondig enum usb_phy_interface
+ */
+enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np,
+		const char *propname)
+{
+	const char *phy_type;
+	int err, i;
+
+	if (!propname)
+		propname = "barebox,phy_type";
+
+	err = of_property_read_string(np, propname, &phy_type);
+	if (err < 0)
+		return USBPHY_INTERFACE_MODE_UNKNOWN;
+
+	for (i = 0; i < ARRAY_SIZE(usbphy_modes); i++)
+		if (!strcmp(phy_type, usbphy_modes[i]))
+			return i;
+
+	return USBPHY_INTERFACE_MODE_UNKNOWN;
+}
+EXPORT_SYMBOL_GPL(of_usb_get_phy_mode);

include/usb/usb.h

@@ -519,4 +519,25 @@ struct usb_device_id {
 
 #endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
+enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np,
+		const char *propname);
+
+enum usb_dr_mode {
+	USB_DR_MODE_UNKNOWN,
+	USB_DR_MODE_HOST,
+	USB_DR_MODE_PERIPHERAL,
+	USB_DR_MODE_OTG,
+};
+
+enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np,
+		const char *propname);
+
+enum usb_phy_interface {
+	USBPHY_INTERFACE_MODE_UNKNOWN,
+	USBPHY_INTERFACE_MODE_UTMI,
+	USBPHY_INTERFACE_MODE_UTMIW,
+	USBPHY_INTERFACE_MODE_ULPI,
+	USBPHY_INTERFACE_MODE_SERIAL,
+	USBPHY_INTERFACE_MODE_HSIC,
+};
 #endif /*_USB_H_ */