[PATCH v9 5/5] usb: dwc3: core: cleanup IRQ resources

[Roger Quadros <rogerq@ti.com>]

Implementations might use different IRQs for
host, gadget and OTG so use named interrupt resources
to allow Device tree to specify the 3 interrupts.

Following are the interrupt names

Peripheral Interrupt - peripheral
HOST Interrupt - host
OTG Interrupt - otg

We still maintain backward compatibility for a single named
interrupt for all 3 interrupts (e.g. for dwc3-pci) and
single unnamed interrupt for all 3 interrupts (e.g. old DT).

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
v9: rebased on top of balbi/testing/next

 drivers/usb/dwc3/core.c   | 10 ----------
 drivers/usb/dwc3/gadget.c | 20 ++++++++++++++++++--
 drivers/usb/dwc3/host.c   | 19 +++++++++++++++++++
 3 files changed, 37 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 9c4e1d8d..5cedf3d 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -843,16 +843,6 @@ static int dwc3_probe(struct platform_device *pdev)
 	dwc->mem = mem;
 	dwc->dev = dev;
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(dev, "missing IRQ\n");
-		return -ENODEV;
-	}
-	dwc->xhci_resources[1].start = res->start;
-	dwc->xhci_resources[1].end = res->end;
-	dwc->xhci_resources[1].flags = res->flags;
-	dwc->xhci_resources[1].name = res->name;
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(dev, "missing memory resource\n");
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index c37168d..c18c72f 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1726,7 +1726,7 @@ static int dwc3_gadget_start(struct usb_gadget *g,
 	int			ret = 0;
 	int			irq;
 
-	irq = platform_get_irq(to_platform_device(dwc->dev), 0);
+	irq = dwc->irq_gadget;
 	ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
 			IRQF_SHARED, "dwc3", dwc->ev_buf);
 	if (ret) {
@@ -1734,7 +1734,6 @@ static int dwc3_gadget_start(struct usb_gadget *g,
 				irq, ret);
 		goto err0;
 	}
-	dwc->irq_gadget = irq;
 
 	spin_lock_irqsave(&dwc->lock, flags);
 	if (dwc->gadget_driver) {
@@ -2853,6 +2852,23 @@ static irqreturn_t dwc3_interrupt(int irq, void *_evt)
 int dwc3_gadget_init(struct dwc3 *dwc)
 {
 	int					ret;
+	struct resource *res;
+	struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
+
+	dwc->irq_gadget = platform_get_irq_byname(dwc3_pdev, "peripheral");
+	if (dwc->irq_gadget <= 0) {
+		dwc->irq_gadget = platform_get_irq_byname(dwc3_pdev,
+							  "dwc_usb3");
+		if (dwc->irq_gadget <= 0) {
+			res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ,
+						    0);
+			if (!res) {
+				dev_err(dwc->dev, "missing peripheral IRQ\n");
+				return -ENODEV;
+			}
+			dwc->irq_gadget = res->start;
+		}
+	}
 
 	dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
 			&dwc->ctrl_req_addr, GFP_KERNEL);
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index c679f63..f2b60a4 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -25,6 +25,25 @@ int dwc3_host_init(struct dwc3 *dwc)
 	struct platform_device	*xhci;
 	struct usb_xhci_pdata	pdata;
 	int			ret;
+	struct resource		*res;
+	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
+
+	res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
+	if (!res) {
+		res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
+						   "dwc_usb3");
+		if (!res) {
+			res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ,
+						    0);
+			if (!res)
+				return -ENOMEM;
+		}
+	}
+
+	dwc->xhci_resources[1].start = res->start;
+	dwc->xhci_resources[1].end = res->end;
+	dwc->xhci_resources[1].flags = res->flags;
+	dwc->xhci_resources[1].name = res->name;
 
 	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
 	if (!xhci) {
-- 
2.7.4