linux-kernel - Re: [PATCH v2 0/3] Introduce usb charger framework to deal with the usb gadget power negotation

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Message-ID: <CAMz4kuJGR1ZQPbBNpp7EABJn=Rag8jSrb-2ztcefUf4R7pk4AQ@mail.gmail.com>
Date:	Mon, 17 Aug 2015 14:02:08 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	Li Jun <b47624@...escale.com>
Cc:	Felipe Balbi <balbi@...com>, Mark Brown <broonie@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Peter Chen <peter.chen@...escale.com>, sojka@...ica.cz,
	Alan Stern <stern@...land.harvard.edu>, r.baldyga@...sung.com,
	yoshihiro.shimoda.uh@...esas.com, linux-usb@...r.kernel.org,
	device-mainlining@...ts.linuxfoundation.org, sre@...nel.org,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>, sameo@...ux.intel.com,
	Lee Jones <lee.jones@...aro.org>,
	patches@...nsource.wolfsonmicro.com, linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Introduce usb charger framework to deal with the
 usb gadget power negotation

On 17 August 2015 at 09:15, Li Jun <b47624@...escale.com> wrote:
> On Fri, Aug 14, 2015 at 07:04:56PM +0800, Baolin Wang wrote:
>> On 14 August 2015 at 16:55, Li Jun <b47624@...escale.com> wrote:
>> > Hi Baolin,
>> >
>> > On Fri, Aug 14, 2015 at 05:47:43PM +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.
>> >>
>> >> Providing a standard framework for doing this in the kernel.
>> >>
>> >
>> > Why not add power supply class support into this?
>> >
>>
>> Hi Jun,
>>
>> We don't need the power supply class support into the usb charger,
> I suppose usb charger is also a power supply for the system, we can use power
> supply class framework for notify mechanism and get/set many attributes(maybe
> also the current limit), I see those usb charger drivers under ./driver/power/
> are designed with power supply supported.
>

I don't think so. The usb charger is rely on the usb gadget, which is
not a complete power supply device and it combines the usb and the
power supply. Thus we make it into usb gadget system. Thanks.

> Li Jun
>> just introduce the notify mechanism for power to set the current limit
>> when notifying some events from usb charger. Maybe I misunderstand
>> your meanings, please describe it detailedly. Thanks for your
>> comments.
>>
>> > Li Jun
>> >
>>
>>
>>
>> --
>> Baolin.wang
>> Best Regards



-- 
Baolin.wang
Best Regards
--
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