Add a "no-op" USB PHY driver for imx-family SoCs. This is used when the

phy clocks need to be enabled, but no other hardware setup is needed to
make the phy work.

sys/arm/freescale/imx/files.imx51

@@ -37,7 +37,8 @@ dev/ata/chipsets/ata-fsl.c		optional imxata
 # UART driver
 dev/uart/uart_dev_imx.c			optional uart
 
-# USB join controller (1 OTG, 3 EHCI)
+# USB OH3 controller (1 OTG, 3 EHCI)
+arm/freescale/imx/imx_nop_usbphy.c	optional echi
 dev/usb/controller/ehci_imx.c		optional ehci
 
 # Watchdog

sys/arm/freescale/imx/files.imx53

@@ -37,7 +37,8 @@ arm/freescale/imx/imx51_ccm.c		standard
 # i.MX5xx PATA controller
 dev/ata/chipsets/ata-fsl.c		optional imxata
 
-# USB join controller (1 OTG, 3 EHCI)
+# USB OH3 controller (1 OTG, 3 EHCI)
+arm/freescale/imx/imx_nop_usbphy.c	optional ehci
 dev/usb/controller/ehci_imx.c		optional ehci
 
 # Watchdog

sys/arm/freescale/imx/imx_nop_usbphy.c

@@ -0,0 +1,118 @@
+/*-
+ * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * USBPHY "no-op" driver for Freescale family of SoCs.  This driver is used on
+ * SoCs which have usbphy hardware whose clocks need to be enabled, but no other
+ * action has to be taken to make the hardware work.
+ */
+
+#include "opt_bus.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+#include <sys/rman.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <machine/bus.h>
+
+#include <arm/freescale/imx/imx_machdep.h>
+
+/*
+ * Table of supported FDT compat strings.
+ */
+static struct ofw_compat_data compat_data[] = {
+	{"nop-usbphy",		true},
+	{"usb-nop-xceiv",	true},
+	{NULL,		 	false},
+};
+
+struct usbphy_softc {
+	device_t	dev;
+	u_int		phy_num;
+};
+
+static int
+usbphy_detach(device_t dev)
+{
+
+	return (0);
+}
+
+static int
+usbphy_attach(device_t dev)
+{
+	struct usbphy_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	/*
+         * Turn on the phy clocks.
+         */
+	imx_ccm_usbphy_enable(dev);
+
+	return (0);
+}
+
+static int
+usbphy_probe(device_t dev)
+{
+
+	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) {
+		device_set_desc(dev, "Freescale USB PHY");
+		return (BUS_PROBE_DEFAULT);
+	}
+
+	return (ENXIO);
+}
+
+static device_method_t usbphy_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,  usbphy_probe),
+	DEVMETHOD(device_attach, usbphy_attach),
+	DEVMETHOD(device_detach, usbphy_detach),
+
+	DEVMETHOD_END
+};
+
+static driver_t usbphy_driver = {
+	"usbphy",
+	usbphy_methods,
+	sizeof(struct usbphy_softc)
+};
+
+static devclass_t usbphy_devclass;
+
+DRIVER_MODULE(usbphy, simplebus, usbphy_driver, usbphy_devclass, 0, 0);
+