Re: [PATCH v12 2/4] gadget: Support for the usb charger framework

Baolin Wang
2016-06-21T12:49:14Z

On 21 June 2016 at 20:36, Felipe Balbi <balbi@kernel.org> wrote:
>
> Hi,
>
> Baolin Wang <baolin.wang@linaro.org> writes:
>>> Baolin Wang <baolin.wang@linaro.org> writes:
>>>>> Baolin Wang <baolin.wang@linaro.org> writes:
>>>>>>> Can't you just tie a charger to a UDC and avoid the charger class
>>>>>>> completely?
>>>>>>
>>>>>> Yeah, I also hope so. But we really want something to manage the
>>>>>> charger devices, do you have any good suggestion to avoid the 'class'
>>>>>> but also can manage the charger devices?
>>>>>
>>>>> manage in what way? It seems to me that they don't need to be real
>>>>> devices, just a handle as part of struct usb_gadget, no?
>>>>
>>>> Although charger device is not one real hardware device, we also use
>>>> one 'struct device' to describe it in charger.c file. So we should
>>>> manage the 'struct device' with one proper way.
>>>
>>> that's fine, but why do you think they need a struct device to start with?
>>
>> We can get/put usb charger and mange usb charger attributes with the
>> device model if we use a struct device.
>
> We already have that as part of struct usb_udc. Why don't you just
> create a subdirectory called charger which will hold all your
> charger-related attributes. That directory will only be created if a
> valid ->charger pointer exists.

That means we can remove all the device and class things in charger.c
file, right? OK, I try to do that. Thanks.

>
> USB Charging is always tied to a peripheral side controller, anyway.
>
> --
> balbi

--
Baolin.wang
Best Regards