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

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Date:	Tue, 29 Mar 2016 10:23:14 -0700
From:	Mark Brown <broonie@...nel.org>
To:	Peter Chen <hzpeterchen@...il.com>
Cc:	Baolin Wang <baolin.wang@...aro.org>,
	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>,
	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 03:13:51PM +0800, Peter Chen wrote:
> On Mon, Mar 28, 2016 at 02:51:40PM +0800, Baolin Wang wrote:

> > > 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?

Even without detection of CDP and DCP we have configurability within SDP
- there's the 2.5mA suspended limit, the 100mA default limit and the
higher 500mA limit which can be negotiated.

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