usb: dwc3: exynos: add support for device tree

This patch adds support to parse probe data for
dwc3-exynos driver using device tree.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/dwc3-exynos.c

@@ -21,6 +21,7 @@
 #include <linux/clk.h>
 #include <linux/usb/otg.h>
 #include <linux/usb/nop-usb-xceiv.h>
+#include <linux/of.h>
 
 #include "core.h"
 
@@ -87,6 +88,8 @@ static int __devinit dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
 	return ret;
 }
 
+static u64 dwc3_exynos_dma_mask = DMA_BIT_MASK(32);
+
 static int __devinit dwc3_exynos_probe(struct platform_device *pdev)
 {
 	struct dwc3_exynos_data	*pdata = pdev->dev.platform_data;
@@ -102,6 +105,14 @@ static int __devinit dwc3_exynos_probe(struct platform_device *pdev)
 		goto err0;
 	}
 
+	/*
+	 * Right now device-tree probed devices don't get dma_mask set.
+	 * Since shared usb code relies on it, set it here for now.
+	 * Once we move to full device tree support this will vanish off.
+	 */
+	if (!pdev->dev.dma_mask)
+		pdev->dev.dma_mask = &dwc3_exynos_dma_mask;
+
 	platform_set_drvdata(pdev, exynos);
 
 	ret = dwc3_exynos_register_phys(exynos);
@@ -191,11 +202,20 @@ static int __devexit dwc3_exynos_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id exynos_dwc3_match[] = {
+	{ .compatible = "samsung,exynos-dwc3" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
+#endif
+
 static struct platform_driver dwc3_exynos_driver = {
 	.probe		= dwc3_exynos_probe,
 	.remove		= __devexit_p(dwc3_exynos_remove),
 	.driver		= {
 		.name	= "exynos-dwc3",
+		.of_match_table = of_match_ptr(exynos_dwc3_match),
 	},
 };