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 10:14:12 -0700
From:	Mark Brown <broonie@...nel.org>
To:	Baolin Wang <baolin.wang@...aro.org>
Cc:	Peter Chen <peter.chen@....com>,
	Peter Chen <hzpeterchen@...il.com>,
	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" <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" 
	<patches@...nsource.wolfsonmicro.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	USB <linux-usb@...r.kernel.org>,
	"device-mainlining@...ts.linuxfoundation.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 Tue, Mar 29, 2016 at 10:05:23AM +0800, Baolin Wang wrote:

> Yes, The user 'wm831x_power' did not implement any callbacks in
> 'usb_charger_detect_type()' function, but in
> 'usb_charger_detect_type()' function it just supplies different
> callbacks to get the charger type with simple logic. Anyway we can try
> to implement one callback to get the charger type and test the API.

The wm831x doesn't have any charger detection features, what it does
have is hardware for implementing a current limit on the power drawn
from USB.  What it's looking for from this framework is for something to
tell it how much current it should draw from USB so it can program the
hardware appropriately to impose that limit.

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