[PATCH v2 RFC] drivers/usb/host/ehci-fsl: Fix interrupt setup in host mode.

[Darren Stevens <darren@xxxxxxxxxxxxxxxx>]

In patch a1a2b7125e10 (Drop static setup of IRQ resource from DT
core) we stopped platform_get_resource() from returning the IRQ, as all
drivers were supposed to have switched to platform_get_irq()
Unfortunately the Freescale EHCI driver in host mode got missed. Fix
it. Also fix allocation of resources to work with current kernel.

Fixes: a1a2b7125e10 (Drop static setup of IRQ resource from DT core)
Reported-by Christian Zigotzky <chzigotzky@xxxxxxxxxxx>
Signed-off-by Darren Stevens <darren@xxxxxxxxxxxxxxxx>
---
 v2 - Fixed coding style, removed a couple of unneeded initializations,
      cc'd Layerscape maintainers.

Tested on AmigaOne X5000/20 and X5000/40 not sure if this is entirely
correct fix though. Contains code by Rob Herring (in fsl-mph-dr-of.c)

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 385be30..8bd258a 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -23,6 +23,7 @@
 #include <linux/platform_device.h>
 #include <linux/fsl_devices.h>
 #include <linux/of_platform.h>
+#include <linux/of_address.h>
 #include <linux/io.h>
 
 #include "ehci.h"
@@ -46,9 +47,10 @@ static struct hc_driver __read_mostly fsl_ehci_hc_driver;
  */
 static int fsl_ehci_drv_probe(struct platform_device *pdev)
 {
+	struct device_node *dn = pdev->dev.of_node;
 	struct fsl_usb2_platform_data *pdata;
 	struct usb_hcd *hcd;
-	struct resource *res;
+	struct resource res;
 	int irq;
 	int retval;
 	u32 tmp;
@@ -76,14 +78,9 @@ static int fsl_ehci_drv_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(&pdev->dev,
-			"Found HC with no IRQ. Check %s setup!\n",
-			dev_name(&pdev->dev));
-		return -ENODEV;
-	}
-	irq = res->start;
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
 
 	hcd = __usb_create_hcd(&fsl_ehci_hc_driver, pdev->dev.parent,
 			       &pdev->dev, dev_name(&pdev->dev), NULL);
@@ -92,15 +89,18 @@ static int fsl_ehci_drv_probe(struct platform_device *pdev)
 		goto err1;
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
+	tmp = of_address_to_resource(dn, 0, &res);
+	if (tmp)
+		return tmp;
+
+	hcd->regs = devm_ioremap_resource(&pdev->dev, &res);
 	if (IS_ERR(hcd->regs)) {
 		retval = PTR_ERR(hcd->regs);
 		goto err2;
 	}
 
-	hcd->rsrc_start = res->start;
-	hcd->rsrc_len = resource_size(res);
+	hcd->rsrc_start = res.start;
+	hcd->rsrc_len = resource_size(&res);
 
 	pdata->regs = hcd->regs;
 
diff --git a/drivers/usb/host/fsl-mph-dr-of.c b/drivers/usb/host/fsl-mph-dr-of.c
index 44a7e58..766e4ab 100644
--- a/drivers/usb/host/fsl-mph-dr-of.c
+++ b/drivers/usb/host/fsl-mph-dr-of.c
@@ -80,8 +80,6 @@ static struct platform_device *fsl_usb2_device_register(
 					const char *name, int id)
 {
 	struct platform_device *pdev;
-	const struct resource *res = ofdev->resource;
-	unsigned int num = ofdev->num_resources;
 	int retval;
 
 	pdev = platform_device_alloc(name, id);
@@ -106,11 +104,8 @@ static struct platform_device *fsl_usb2_device_register(
 	if (retval)
 		goto error;
 
-	if (num) {
-		retval = platform_device_add_resources(pdev, res, num);
-		if (retval)
-			goto error;
-	}
+	pdev->dev.of_node = ofdev->dev.of_node;
+	pdev->dev.of_node_reused = true;
 
 	retval = platform_device_add(pdev);
 	if (retval)