On Thu, Mar 03, 2016 at 03:42:47PM +0100, Andrew Lunn wrote: > On Thu, Mar 03, 2016 at 06:01:15PM +0800, Peter Chen wrote: > > From: Peter Chen <peter.chen@xxxxxxxxxxxxx> > > > > 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@xxxxxxxxxxxxx> > > --- > > 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 053bac9..55120ef 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; > > Is this a good idea? Two devices with the same of_node? > This is only for chipidea driver whose host controller device doesn't have entry at dts, but other host controller driver which supports device tree should have its entry at dts. > I know the networking code assumes of_node values are unique, and uses > it to find a device. Are you 100% sure the USB code does not make this > assumption. > The controller device is the root for USB device, the common USB code will not touch its glue layer device (controller's parent). -- Best Regards, Peter Chen -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
