[PATCH v2 02/12] usb: dwc3-generic: Allow different controller DT node pattern

[Kunihiko Hayashi]

The most of devicetree has the following USB node structure.
The controller node is placed as a child node of the glue node.
Current dwc3-generic driver works on this premise.

    glue {
        /* glue node */
	usb {
            /* controller node */
	};
    };

However, UniPhier original devicetree has the following USB node structure.
The controller node is separately placed from the glue node.

    usb {
        /* controller node */
    };
    glue {
        /* glue node */
    };

In dwc_glue_bind(), this patch provides .glue_get_ctrl_dev() callback to
get such a controller node and binds the driver related to the node.

If this callback isn't defined, dwc_glue_bind() looks for the controller
nodes from the child nodes, as before.

Suggested-by: Marek Vasut <marex at denx.de>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko at socionext.com>
---
 drivers/usb/dwc3/dwc3-generic.c | 93 ++++++++++++++++++++-------------
 1 file changed, 57 insertions(+), 36 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index 42e92478f2..e32003d68e 100644
--- a/drivers/usb/dwc3/dwc3-generic.c
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -276,6 +276,7 @@ U_BOOT_DRIVER(dwc3_generic_host) = {
 #endif
 
 struct dwc3_glue_ops {
+	int (*glue_get_ctrl_dev)(struct udevice *parent, ofnode *node);
 	void (*glue_configure)(struct udevice *dev, int index,
 			       enum usb_dr_mode mode);
 };
@@ -415,54 +416,74 @@ struct dwc3_glue_ops ti_ops = {
 	.glue_configure = dwc3_ti_glue_configure,
 };
 
-static int dwc3_glue_bind(struct udevice *parent)
+static int dwc3_glue_bind_common(struct udevice *parent, ofnode node)
 {
-	ofnode node;
-	int ret;
+	const char *name = ofnode_get_name(node);
+	const char *driver = NULL;
 	enum usb_dr_mode dr_mode;
+	struct udevice *dev;
+	int ret;
 
-	dr_mode = usb_get_dr_mode(dev_ofnode(parent));
-
-	ofnode_for_each_subnode(node, dev_ofnode(parent)) {
-		const char *name = ofnode_get_name(node);
-		struct udevice *dev;
-		const char *driver = NULL;
-
-		debug("%s: subnode name: %s\n", __func__, name);
+	debug("%s: subnode name: %s\n", __func__, name);
 
-		/* if the parent node doesn't have a mode check the leaf */
-		if (!dr_mode)
-			dr_mode = usb_get_dr_mode(node);
+	/* if the parent node doesn't have a mode check the leaf */
+	dr_mode = usb_get_dr_mode(dev_ofnode(parent));
+	if (!dr_mode)
+		dr_mode = usb_get_dr_mode(node);
 
-		switch (dr_mode) {
-		case USB_DR_MODE_PERIPHERAL:
-		case USB_DR_MODE_OTG:
+	switch (dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+	case USB_DR_MODE_OTG:
 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
-			debug("%s: dr_mode: OTG or Peripheral\n", __func__);
-			driver = "dwc3-generic-peripheral";
+		debug("%s: dr_mode: OTG or Peripheral\n", __func__);
+		driver = "dwc3-generic-peripheral";
 #endif
-			break;
+		break;
 #if defined(CONFIG_SPL_USB_HOST) || !defined(CONFIG_SPL_BUILD)
-		case USB_DR_MODE_HOST:
-			debug("%s: dr_mode: HOST\n", __func__);
-			driver = "dwc3-generic-host";
-			break;
+	case USB_DR_MODE_HOST:
+		debug("%s: dr_mode: HOST\n", __func__);
+		driver = "dwc3-generic-host";
+		break;
 #endif
-		default:
-			debug("%s: unsupported dr_mode\n", __func__);
-			return -ENODEV;
-		};
+	default:
+		debug("%s: unsupported dr_mode\n", __func__);
+		return -ENODEV;
+	};
 
-		if (!driver)
-			continue;
+	if (!driver)
+		return -ENXIO;
+
+	ret = device_bind_driver_to_node(parent, driver, name,
+					 node, &dev);
+	if (ret) {
+		debug("%s: not able to bind usb device mode\n",
+		      __func__);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int dwc3_glue_bind(struct udevice *parent)
+{
+	struct dwc3_glue_ops *ops = (struct dwc3_glue_ops *)dev_get_driver_data(parent);
+	ofnode node;
+	int ret;
 
-		ret = device_bind_driver_to_node(parent, driver, name,
-						 node, &dev);
-		if (ret) {
-			debug("%s: not able to bind usb device mode\n",
-			      __func__);
+	if (ops && ops->glue_get_ctrl_dev) {
+		ret = ops->glue_get_ctrl_dev(parent, &node);
+		if (ret)
+			return ret;
+
+		return dwc3_glue_bind_common(parent, node);
+	}
+
+	ofnode_for_each_subnode(node, dev_ofnode(parent)) {
+		ret = dwc3_glue_bind_common(parent, node);
+		if (ret == -ENXIO)
+			continue;
+		if (ret)
 			return ret;
-		}
 	}
 
 	return 0;
-- 
2.25.1