usb: chipidea: permit driver bindings pass phy pointer

Sometimes, the driver bindings may know what phy they use.
For example, when using device tree, the usb controller may have a
phandler pointing to usb phy.
Signed-off-by: Richard Zhao <richard.zhao@freescale.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Acked-by: Felipe Balbi <balbi@ti.com>
Tested-by: Subodh Nijsure <snijsure@grid-net.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/chipidea/ci.h

@@ -160,6 +160,8 @@ struct ci13xxx {
 
 	struct ci13xxx_platform_data	*platdata;
 	int				vbus_active;
+	/* FIXME: some day, we'll not use global phy */
+	bool				global_phy;
 	struct usb_phy			*transceiver;
 	struct usb_hcd			*hcd;
 };

drivers/usb/chipidea/core.c

@@ -419,6 +419,10 @@ static int __devinit ci_hdrc_probe(struct platform_device *pdev)
 
 	ci->dev = dev;
 	ci->platdata = dev->platform_data;
+	if (ci->platdata->phy)
+		ci->transceiver = ci->platdata->phy;
+	else
+		ci->global_phy = true;
 
 	ret = hw_device_init(ci, base);
 	if (ret < 0) {

drivers/usb/chipidea/host.c

@@ -117,6 +117,7 @@ static int host_start(struct ci13xxx *ci)
 	hcd->has_tt = 1;
 
 	hcd->power_budget = ci->platdata->power_budget;
+	hcd->phy = ci->transceiver;
 
 	ehci = hcd_to_ehci(hcd);
 	ehci->caps = ci->hw_bank.cap;

drivers/usb/chipidea/udc.c

@@ -1685,6 +1685,7 @@ static int udc_start(struct ci13xxx *ci)
 
 	ci->gadget.ep0 = &ci->ep0in->ep;
 
+	if (ci->global_phy)
 		ci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
 
 	if (ci->platdata->flags & CI13XXX_REQUIRE_TRANSCEIVER) {
@@ -1729,6 +1730,7 @@ static int udc_start(struct ci13xxx *ci)
 remove_trans:
 	if (!IS_ERR_OR_NULL(ci->transceiver)) {
 		otg_set_peripheral(ci->transceiver->otg, &ci->gadget);
+		if (ci->global_phy)
 			usb_put_phy(ci->transceiver);
 	}
 
@@ -1738,7 +1740,7 @@ static int udc_start(struct ci13xxx *ci)
 unreg_device:
 	device_unregister(&ci->gadget.dev);
 put_transceiver:
-	if (!IS_ERR_OR_NULL(ci->transceiver))
+	if (!IS_ERR_OR_NULL(ci->transceiver) && ci->global_phy)
 		usb_put_phy(ci->transceiver);
 free_pools:
 	dma_pool_destroy(ci->td_pool);
@@ -1772,6 +1774,7 @@ static void udc_stop(struct ci13xxx *ci)
 
 	if (!IS_ERR_OR_NULL(ci->transceiver)) {
 		otg_set_peripheral(ci->transceiver->otg, NULL);
+		if (ci->global_phy)
 			usb_put_phy(ci->transceiver);
 	}
 	dbg_remove_files(&ci->gadget.dev);

include/linux/usb/chipidea.h

@@ -5,12 +5,15 @@
 #ifndef __LINUX_USB_CHIPIDEA_H
 #define __LINUX_USB_CHIPIDEA_H
 
+#include <linux/usb/otg.h>
+
 struct ci13xxx;
 struct ci13xxx_platform_data {
 	const char	*name;
 	/* offset of the capability registers */
 	uintptr_t	 capoffset;
 	unsigned	 power_budget;
+	struct usb_phy	*phy;
 	unsigned long	 flags;
 #define CI13XXX_REGS_SHARED		BIT(0)
 #define CI13XXX_REQUIRE_TRANSCEIVER	BIT(1)