Date: Mon, 28 Mar 2016 15:13:51 +0800
From: Peter Chen <hzpeterchen@gmail.com>
To: Baolin Wang <baolin.wang@linaro.org>
Cc: Felipe Balbi <balbi@kernel.org>, Greg KH <gregkh@linuxfoundation.org>,
        Sebastian Reichel <sre@kernel.org>,
        Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Peter Chen <peter.chen@freescale.com>,
        Alan Stern <stern@rowland.harvard.edu>, r.baldyga@samsung.com,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
        Lee Jones <lee.jones@linaro.org>, Mark Brown <broonie@kernel.org>,
        Charles Keepax <ckeepax@opensource.wolfsonmicro.com>,
        patches@opensource.wolfsonmicro.com,
        Linux PM list <linux-pm@vger.kernel.org>,
        USB <linux-usb@vger.kernel.org>,
        device-mainlining@lists.linuxfoundation.org,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v8 0/4] Introduce usb charger framework to deal with the
 usb gadget power negotation
Message-ID: <20160328071351.GC3302@peterchendt>
References: <cover.1458822334.git.baolin.wang@linaro.org>
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 <CAMz4kuJYBg4eortA35Dhr4-jPVhLzu9XhjpOcu0hDWq6FV09mw@mail.gmail.com>
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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?

-- 
Best Regards,
Peter Chen