linux-kernel - Re: [PATCH v10 13/14] usb: gadget: udc: adapt to OTG core

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Date:	Mon, 13 Jun 2016 15:20:19 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Roger Quadros <rogerq@...com>
Cc:	peter.chen@...escale.com, balbi@...nel.org, tony@...mide.com,
	gregkh@...uxfoundation.org, dan.j.williams@...el.com,
	mathias.nyman@...ux.intel.com, Joao.Pinto@...opsys.com,
	sergei.shtylyov@...entembedded.com, jun.li@...escale.com,
	grygorii.strashko@...com, yoshihiro.shimoda.uh@...esas.com,
	robh@...nel.org, nsekhar@...com, b-liu@...com, joe@...ches.com,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v10 13/14] usb: gadget: udc: adapt to OTG core

On Mon, Jun 13, 2016 at 10:14:31AM +0300, Roger Quadros wrote:
> On 12/06/16 14:36, Peter Chen wrote:
> > On Fri, Jun 10, 2016 at 04:07:22PM +0300, Roger Quadros wrote:
> >>  
> >> +/**
> >> + * 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.

> 
> 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.

/**
 * 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);
-- 

Best Regards,
Peter Chen