On Mon, Jun 13, 2016 at 10:37:59AM +0300, Roger Quadros wrote:

On 13/06/16 10:20, Peter Chen wrote:

quoted

On Mon, Jun 13, 2016 at 10:14:31AM +0300, Roger Quadros wrote:

quoted

On 12/06/16 14:36, Peter Chen wrote:

quoted

On Fri, Jun 10, 2016 at 04:07:22PM +0300, Roger Quadros wrote:

quoted

 
+/**
+ * usb_otg_add_gadget_udc - adds a new gadget to the udc class driver list
+ * @parent: the parent device to this udc. Usually the controller
+ * driver's device.

It seems it should be udc device

Parent and udc->dev are not the same right?

Sure, udc's parent is otg device.

quoted

I guess i'll omit the second statement to avoid confusion. So.

@parent: the parent device to this udc.

Where you call below APIs? It seems to be a udc driver, right?
So, when you try to get "otg-controller" from the node, this node
should be udc.

@parent is actually the device that represents the USB Device controller
in the device tree. When you call usb_add_gadget_udc_release() a new
udc->dev device is created as it's child.

See explanation for the @parent argument in usb_add_gadget_udc_release().
As we want to keep the parent argument identical to that I will not make
any changes then.

Oh, yes. The parent should be glue layer udc device or the dual-role controller
device.

Peter

quoted

/**
 * usb_otg_add_gadget_udc - adds a new gadget to the udc class driver list
 * @parent: the parent device to this udc. Usually the controller
 * driver's device.
 * @gadget: the gadget to be added to the list
 * @otg_dev: the OTG controller device
 *
 * If otg_dev is NULL then device tree node is checked
 * for OTG controller via the otg-controller property.
 * Returns zero on success, negative errno otherwise.
 */
int usb_otg_add_gadget_udc(struct device *parent, struct usb_gadget *gadget,
			   struct device *otg_dev)
{
	if (!otg_dev) {
		gadget->otg_dev = of_usb_get_otg(parent->of_node);
		if (!gadget->otg_dev)
			return -ENODEV;
	} else {
		gadget->otg_dev = otg_dev;
	}

	return usb_add_gadget_udc_release(parent, gadget, NULL);
}
EXPORT_SYMBOL_GPL(usb_otg_add_gadget_udc);

--
cheers,
-roger

-- 

Best Regards,
Peter Chen
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html