usb: twl4030: Add device tree support for twl4030 usb

Add device tree support for twl4030 usb driver.
Update the Documentation with device tree binding information.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 20 insertions, 6 deletions

diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
index 523cad5bfea9..f0d2e7530cfe 100644
--- a/drivers/usb/otg/twl4030-usb.c
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -585,23 +585,28 @@ static int __devinit twl4030_usb_probe(struct platform_device *pdev)
         struct twl4030_usb      *twl;
         int                     status, err;
         struct usb_otg          *otg;
-
-        if (!pdata) {
-                dev_dbg(&pdev->dev, "platform_data not available\n");
-                return -EINVAL;
-        }
+        struct device_node      *np = pdev->dev.of_node;
 
         twl = devm_kzalloc(&pdev->dev, sizeof *twl, GFP_KERNEL);
         if (!twl)
                 return -ENOMEM;
 
+        if (np)
+                of_property_read_u32(np, "usb_mode",
+                                (enum twl4030_usb_mode *)&twl->usb_mode);
+        else if (pdata)
+                twl->usb_mode = pdata->usb_mode;
+        else {
+                dev_err(&pdev->dev, "twl4030 initialized without pdata\n");
+                return -EINVAL;
+        }
+
         otg = devm_kzalloc(&pdev->dev, sizeof *otg, GFP_KERNEL);
         if (!otg)
                 return -ENOMEM;
 
         twl->dev                = &pdev->dev;
         twl->irq                = platform_get_irq(pdev, 0);
-        twl->usb_mode           = pdata->usb_mode;
         twl->vbus_supplied      = false;
         twl->asleep             = 1;
         twl->linkstat           = OMAP_MUSB_UNKNOWN;
@@ -690,12 +695,21 @@ static int __exit twl4030_usb_remove(struct platform_device *pdev)
         return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id twl4030_usb_id_table[] = {
+        { .compatible = "ti,twl4030-usb" },
+        {}
+};
+MODULE_DEVICE_TABLE(of, twl4030_usb_id_table);
+#endif
+
 static struct platform_driver twl4030_usb_driver = {
         .probe          = twl4030_usb_probe,
         .remove         = __exit_p(twl4030_usb_remove),
         .driver         = {
                 .name   = "twl4030_usb",
                 .owner  = THIS_MODULE,
+                .of_match_table = of_match_ptr(twl4030_usb_id_table),
         },
 };