On 13/06/16 10:20, Peter Chen wrote:
> 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.
@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.
>
> /**
> * 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
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