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

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Message-ID: <20160328071351.GC3302@peterchendt>
Date:	Mon, 28 Mar 2016 15:13:51 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Baolin Wang <baolin.wang@...aro.org>
Cc:	Felipe Balbi <balbi@...nel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Peter Chen <peter.chen@...escale.com>,
	Alan Stern <stern@...land.harvard.edu>, r.baldyga@...sung.com,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Lee Jones <lee.jones@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
	patches@...nsource.wolfsonmicro.com,
	Linux PM list <linux-pm@...r.kernel.org>,
	USB <linux-usb@...r.kernel.org>,
	device-mainlining@...ts.linuxfoundation.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 0/4] Introduce usb charger framework to deal with the
 usb gadget power negotation

On Mon, Mar 28, 2016 at 02:51:40PM +0800, Baolin Wang wrote:
> On 25 March 2016 at 15:09, Peter Chen <hzpeterchen@...il.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