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

Felipe Balbi
2016-06-21T12:48:45Z

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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.

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

--
balbi

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