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

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Date:	Mon, 17 Aug 2015 09:15:44 +0800
From:	Li Jun <b47624@...escale.com>
To:	Baolin Wang <baolin.wang@...aro.org>
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>,
	<dbaryshkov@...il.com>, <dwmw2@...radead.org>,
	<sameo@...ux.intel.com>, <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 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.

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
--
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