Moved global variable "musb_debugfs_root" and static variable
"old_state" to 'struct musb' to help support multi instance of
musb controller as present on AM335x platform.

Also removed the global variable "orig_dma_mask" and filled the
dev->dma_mask with parent device's dma_mask.

Signed-off-by: Ajay Kumar Gupta <redacted>
---
 drivers/usb/musb/musb_core.c    |   16 +++-------------
 drivers/usb/musb/musb_core.h    |    4 ++++
 drivers/usb/musb/musb_debugfs.c |   14 ++++++++------
 3 files changed, 15 insertions(+), 19 deletions(-)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 3e09984..a5db4dd 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c

@@ -1802,10 +1802,9 @@ static const struct attribute_group musb_attr_group = {
 static void musb_irq_work(struct work_struct *data)
 {
 	struct musb *musb = container_of(data, struct musb, irq_work);
-	static int old_state;
 
-	if (musb->xceiv->state != old_state) {
-		old_state = musb->xceiv->state;
+	if (musb->xceiv->state != musb->xceiv_old_state) {
+		musb->xceiv_old_state = musb->xceiv->state;
 		sysfs_notify(&musb->controller->kobj, NULL, "mode");
 	}
 }

@@ -2115,11 +2114,6 @@ fail0:
 /* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just
  * bridge to a platform device; this driver then suffices.
  */
-
-#ifndef CONFIG_MUSB_PIO_ONLY
-static u64	*orig_dma_mask;
-#endif
-
 static int __devinit musb_probe(struct platform_device *pdev)
 {
 	struct device	*dev = &pdev->dev;

@@ -2138,10 +2132,6 @@ static int __devinit musb_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-#ifndef CONFIG_MUSB_PIO_ONLY
-	/* clobbered by use_dma=n */
-	orig_dma_mask = dev->dma_mask;
-#endif
 	status = musb_init_controller(dev, irq, base);
 	if (status < 0)
 		iounmap(base);

@@ -2166,7 +2156,7 @@ static int __devexit musb_remove(struct platform_device *pdev)
 	iounmap(ctrl_base);
 	device_init_wakeup(&pdev->dev, 0);
 #ifndef CONFIG_MUSB_PIO_ONLY
-	pdev->dev.dma_mask = orig_dma_mask;
+	pdev->dev.dma_mask = (&dev->dev.parent)->dma_mask;