usb: dwc3: Drop unneeded calls to platform_get_resource_byname()

Drop unneeded calls to platform_get_resource_byname() from
dwc3_host_init(). dwc3_host_init() already calls dwc3_host_get_irq()
which gets the irq number, just use this to get the IRQ resource data
and fill the xhci_resources[1]
Reviewed-by: NRoger Quadros <rogerq@kernel.org>
Signed-off-by: NLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20211220010411.12075-4-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/host.c

@@ -8,32 +8,55 @@
  */
 
 #include <linux/acpi.h>
+#include <linux/irq.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 
 #include "core.h"
 
+static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc,
+					int irq, char *name)
+{
+	struct platform_device *pdev = to_platform_device(dwc->dev);
+	struct device_node *np = dev_of_node(&pdev->dev);
+
+	dwc->xhci_resources[1].start = irq;
+	dwc->xhci_resources[1].end = irq;
+	dwc->xhci_resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(irq);
+	if (!name && np)
+		dwc->xhci_resources[1].name = of_node_full_name(pdev->dev.of_node);
+	else
+		dwc->xhci_resources[1].name = name;
+}
+
 static int dwc3_host_get_irq(struct dwc3 *dwc)
 {
 	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
 	int irq;
 
 	irq = platform_get_irq_byname_optional(dwc3_pdev, "host");
-	if (irq > 0)
+	if (irq > 0) {
+		dwc3_host_fill_xhci_irq_res(dwc, irq, "host");
 		goto out;
+	}
 
 	if (irq == -EPROBE_DEFER)
 		goto out;
 
 	irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
-	if (irq > 0)
+	if (irq > 0) {
+		dwc3_host_fill_xhci_irq_res(dwc, irq, "dwc_usb3");
 		goto out;
+	}
 
 	if (irq == -EPROBE_DEFER)
 		goto out;
 
 	irq = platform_get_irq(dwc3_pdev, 0);
-	if (irq > 0)
+	if (irq > 0) {
+		dwc3_host_fill_xhci_irq_res(dwc, irq, NULL);
 		goto out;
+	}
 
 	if (!irq)
 		irq = -EINVAL;
@@ -47,28 +70,12 @@ int dwc3_host_init(struct dwc3 *dwc)
 	struct property_entry	props[4];
 	struct platform_device	*xhci;
 	int			ret, irq;
-	struct resource		*res;
-	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
 	int			prop_idx = 0;
 
 	irq = dwc3_host_get_irq(dwc);
 	if (irq < 0)
 		return irq;
 
-	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 = irq;
-	dwc->xhci_resources[1].end = irq;
-	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) {
 		dev_err(dwc->dev, "couldn't allocate xHCI device\n");