[RFC PATCH 4/5] usb: chipidea: host: let the hcd know's parent device node

[Peter Chen]

Since the hcd (chipidea core device) has no device node, so
if we want to describe the child node under the hcd, we had
to put it under its parent's node (glue layer device), and
in the code, we need to let the hcd knows glue layer's code,
then the USB core can handle this node.

Signed-off-by: Peter Chen <peter.chen at freescale.com>
---
 drivers/usb/chipidea/host.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
index 3d24304..63a6aa4 100644
--- a/drivers/usb/chipidea/host.c
+++ b/drivers/usb/chipidea/host.c
@@ -109,15 +109,25 @@ static int host_start(struct ci_hdrc *ci)
 	struct ehci_hcd *ehci;
 	struct ehci_ci_priv *priv;
 	int ret;
+	struct device *dev = ci->dev;
 
-	if (usb_disabled())
+	if (usb_disabled() || !dev)
 		return -ENODEV;
 
-	hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
+	/*
+	 * USB Core will try to get child node under roothub,
+	 * but chipidea core has no of_node, and the child node
+	 * for controller is located at glue layer's node which
+	 * is chipidea core's parent.
+	 */
+	if (dev->parent && dev->parent->of_node)
+		dev->of_node = dev->parent->of_node;
+
+	hcd = usb_create_hcd(&ci_ehci_hc_driver, dev, dev_name(dev));
 	if (!hcd)
 		return -ENOMEM;
 
-	dev_set_drvdata(ci->dev, ci);
+	dev_set_drvdata(dev, ci);
 	hcd->rsrc_start = ci->hw_bank.phys;
 	hcd->rsrc_len = ci->hw_bank.size;
 	hcd->regs = ci->hw_bank.abs;
@@ -143,7 +153,7 @@ static int host_start(struct ci_hdrc *ci)
 		if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
 			ret = regulator_enable(ci->platdata->reg_vbus);
 			if (ret) {
-				dev_err(ci->dev,
+				dev_err(dev,
 				"Failed to enable vbus regulator, ret=%d\n",
 									ret);
 				goto put_hcd;
-- 
1.9.1