[PATCH 5/9] usb: add phy connection by phy-mode

[Michael Grzeschik]

This patch makes it possible to set the connection of the usbphy to the
soc. It is derived from the oftree bindings for the ethernetphy and adds
similar helperfunctions.

Signed-off-by: Michael Grzeschik <m.grzeschik at pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl at pengutronix.de>
---
 drivers/of/Kconfig        |    4 ++++
 drivers/of/Makefile       |    1 +
 drivers/of/of_usbphy.c    |   49 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/of_usbphy.h |   15 ++++++++++++++
 include/linux/usb/phy.h   |    8 ++++++++
 5 files changed, 77 insertions(+)
 create mode 100644 drivers/of/of_usbphy.c
 create mode 100644 include/linux/of_usbphy.h

diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index dfba3e6..28f99fb 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -67,6 +67,10 @@ config OF_MDIO
 	help
 	  OpenFirmware MDIO bus (Ethernet PHY) accessors
 
+config OF_USBPHY
+	depends on USB
+	def_bool y
+
 config OF_PCI
 	def_tristate PCI
 	depends on PCI
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index e027f44..fdcaf51 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_OF_IRQ)    += irq.o
 obj-$(CONFIG_OF_DEVICE) += device.o platform.o
 obj-$(CONFIG_OF_I2C)	+= of_i2c.o
 obj-$(CONFIG_OF_NET)	+= of_net.o
+obj-$(CONFIG_OF_USBPHY)	+= of_usbphy.o
 obj-$(CONFIG_OF_SELFTEST) += selftest.o
 obj-$(CONFIG_OF_MDIO)	+= of_mdio.o
 obj-$(CONFIG_OF_PCI)	+= of_pci.o
diff --git a/drivers/of/of_usbphy.c b/drivers/of/of_usbphy.c
new file mode 100644
index 0000000..2e71f7b
--- /dev/null
+++ b/drivers/of/of_usbphy.c
@@ -0,0 +1,49 @@
+/*
+ * OF helpers for network devices.
+ *
+ * This file is released under the GPLv2
+ *
+ * Initially copied out of drivers/of/of_net.c
+ */
+#include <linux/etherdevice.h>
+#include <linux/kernel.h>
+#include <linux/of_usbphy.h>
+#include <linux/usb/phy.h>
+#include <linux/export.h>
+
+/**
+ * It maps 'enum usb_phy_interface' found in include/linux/usb/phy.h
+ * into the device tree binding of 'phy-mode', so that USB
+ * device driver can get phy interface from device tree.
+ */
+static const char *usbphy_modes[] = {
+	[USBPHY_INTERFACE_MODE_NA]	= "",
+	[USBPHY_INTERFACE_MODE_UTMI]	= "utmi",
+	[USBPHY_INTERFACE_MODE_UTMIW]	= "utmiw",
+	[USBPHY_INTERFACE_MODE_ULPI]	= "ulpi",
+	[USBPHY_INTERFACE_MODE_SERIAL]	= "fsls",
+};
+
+/**
+ * of_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-mode',
+ * and return its index in phy_modes table, or errno in error case.
+ */
+const int of_get_usbphy_mode(struct device_node *np)
+{
+	const char *pm;
+	int err, i;
+
+	err = of_property_read_string(np, "phy-mode", &pm);
+	if (err < 0)
+		return err;
+
+	for (i = 0; i < ARRAY_SIZE(usbphy_modes); i++)
+		if (!strcasecmp(pm, usbphy_modes[i]))
+			return i;
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(of_get_usbphy_mode);
diff --git a/include/linux/of_usbphy.h b/include/linux/of_usbphy.h
new file mode 100644
index 0000000..9a4132d
--- /dev/null
+++ b/include/linux/of_usbphy.h
@@ -0,0 +1,15 @@
+/*
+ * OF helpers for usb devices.
+ *
+ * This file is released under the GPLv2
+ */
+
+#ifndef __LINUX_OF_USBPHY_H
+#define __LINUX_OF_USBPHY_H
+
+#ifdef CONFIG_OF_USBPHY
+#include <linux/of.h>
+extern const int of_get_usbphy_mode(struct device_node *np);
+#endif
+
+#endif /* __LINUX_OF_USBPHY_H */
diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
index a29ae1e..150eb69 100644
--- a/include/linux/usb/phy.h
+++ b/include/linux/usb/phy.h
@@ -12,6 +12,14 @@
 #include <linux/notifier.h>
 #include <linux/usb.h>
 
+enum usb_phy_interface {
+	USBPHY_INTERFACE_MODE_NA,
+	USBPHY_INTERFACE_MODE_UTMI,
+	USBPHY_INTERFACE_MODE_UTMIW,
+	USBPHY_INTERFACE_MODE_ULPI,
+	USBPHY_INTERFACE_MODE_SERIAL,
+};
+
 enum usb_phy_events {
 	USB_EVENT_NONE,         /* no events or cable disconnected */
 	USB_EVENT_VBUS,         /* vbus valid event */
-- 
1.7.10.4