Re: [PATCH v8 0/4] Introduce usb charger framework to deal with the usb gadget power negotation

Baolin Wang
2016-03-28T09:09:58Z

On 28 March 2016 at 15:13, Peter Chen <hzpeterchen@gmail.com> wrote:
> On Mon, Mar 28, 2016 at 02:51:40PM +0800, Baolin Wang wrote:
>> On 25 March 2016 at 15:09, Peter Chen <hzpeterchen@gmail.com> wrote:
>> > On Thu, Mar 24, 2016 at 08:35:53PM +0800, Baolin Wang wrote:
>> >> Currently the Linux kernel does not provide any standard integration of this
>> >> feature that integrates the USB subsystem with the system power regulation
>> >> provided by PMICs meaning that either vendors must add this in their kernels
>> >> or USB gadget devices based on Linux (such as mobile phones) may not behave
>> >> as they should. Thus provide a standard framework for doing this in kernel.
>> >>
>> >> Now introduce one user with wm831x_power to support and test the usb charger,
>> >> which is pending testing. Moreover there may be other potential users will use
>> >> it in future.
>> >>
>> >
>> > I am afraid I still not find the user (udc driver) for this framework, I would
>> > like to see how udc driver block the enumeration until the charger detection
>> > has finished, or am I missing something?
>>
>> It is not for udc driver but for power users who want to negotiate
>> with USB subsystem.
>>
>
> Then, where is the code the test user to decide what kinds of USB charger
> (SDP, CDP, DCP) is connecting now?

Users can choose to implement multiple ways to get the charger type In
'usb_charger_detect_type()' function.

>
> --
> Best Regards,
> Peter Chen

--
Baolin.wang
Best Regards