Date: Mon, 17 Aug 2015 09:15:44 +0800
From: Li Jun <b47624@freescale.com>
To: Baolin Wang <baolin.wang@linaro.org>
CC: Felipe Balbi <balbi@ti.com>, Mark Brown <broonie@kernel.org>,
        "Linus Walleij" <linus.walleij@linaro.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Greg KH <gregkh@linuxfoundation.org>,
        Peter Chen <peter.chen@freescale.com>, <sojka@merica.cz>,
        Alan Stern <stern@rowland.harvard.edu>, <r.baldyga@samsung.com>,
        <yoshihiro.shimoda.uh@renesas.com>, <linux-usb@vger.kernel.org>,
        <device-mainlining@lists.linuxfoundation.org>, <sre@kernel.org>,
        <dbaryshkov@gmail.com>, <dwmw2@infradead.org>, <sameo@linux.intel.com>,
        <lee.jones@linaro.org>, <patches@opensource.wolfsonmicro.com>,
        <linux-pm@vger.kernel.org>
Subject: Re: [PATCH v2 0/3] Introduce usb charger framework to deal with the
 usb gadget power negotation
Message-ID: <20150817011541.GA7122@shlinux2>
References: <cover.1439519412.git.baolin.wang@linaro.org>
 <20150814085527.GA17920@shlinux2>
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On Fri, Aug 14, 2015 at 07:04:56PM +0800, Baolin Wang wrote:
> On 14 August 2015 at 16:55, Li Jun <b47624@freescale.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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