usb: dwc3: core: add dt support for dwc3 core

Added dt support for dwc3 core and update the documentation with
device tree binding information. Getting a PHY is now done using
devm_usb_get_phy_by_phandle() for dt boot.

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

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
new file mode 100644 (file)
index 0000000..7a95c65
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -0,0 +1,22 @@
+synopsys DWC3 CORE
+
+DWC3- USB3 CONTROLLER
+
+Required properties:
+ - compatible: must be "synopsys,dwc3"
+ - reg : Address and length of the register set for the device
+ - interrupts: Interrupts used by the dwc3 controller.
+ - usb-phy : array of phandle for the PHY device
+
+Optional properties:
+ - tx-fifo-resize: determines if the FIFO *has* to be reallocated.
+
+This is usually a subnode to DWC3 glue to which it is connected.
+
+dwc3@4a030000 {
+       compatible = "synopsys,dwc3";
+       reg = <0x4a030000 0xcfff>;
+       interrupts = <0 92 4>
+       usb-phy = <&usb2_phy>, <&usb3,phy>;
+       tx-fifo-resize;
+};

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 3a4004a..8044025 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -420,13 +420,19 @@ static int dwc3_probe(struct platform_device *pdev)
                return -ENOMEM;
        }
 
-       dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
+       if (node) {
+               dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
+               dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
+       } else {
+               dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
+               dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
+       }
+
        if (IS_ERR_OR_NULL(dwc->usb2_phy)) {
                dev_err(dev, "no usb2 phy configured\n");
                return -EPROBE_DEFER;
        }
 
-       dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
        if (IS_ERR_OR_NULL(dwc->usb3_phy)) {
                dev_err(dev, "no usb3 phy configured\n");
                return -EPROBE_DEFER;
@@ -450,8 +456,7 @@ static int dwc3_probe(struct platform_device *pdev)
        else
                dwc->maximum_speed = DWC3_DCFG_SUPERSPEED;
 
-       if (of_get_property(node, "tx-fifo-resize", NULL))
-               dwc->needs_fifo_resize = true;
+       dwc->needs_fifo_resize = of_property_read_bool(node, "tx-fifo-resize");
 
        pm_runtime_enable(dev);
        pm_runtime_get_sync(dev);
@@ -580,11 +585,22 @@ static int dwc3_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id of_dwc3_match[] = {
+       {
+               .compatible = "synopsys,dwc3"
+       },
+       { },
+};
+MODULE_DEVICE_TABLE(of, of_dwc3_match);
+#endif
+
 static struct platform_driver dwc3_driver = {
        .probe          = dwc3_probe,
        .remove         = dwc3_remove,
        .driver         = {
                .name   = "dwc3",
+               .of_match_table = of_match_ptr(of_dwc3_match),
        },
 };