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In-Reply-To: <20160325070937.GA22398@peterchendt>
References: <cover.1458822334.git.baolin.wang@linaro.org>
	<20160325070937.GA22398@peterchendt>
Date: Mon, 28 Mar 2016 14:51:40 +0800
Message-ID: <CAMz4kuJYBg4eortA35Dhr4-jPVhLzu9XhjpOcu0hDWq6FV09mw@mail.gmail.com>
Subject: Re: [PATCH v8 0/4] Introduce usb charger framework to deal with the
 usb gadget power negotation
From: Baolin Wang <baolin.wang@linaro.org>
To: Peter Chen <hzpeterchen@gmail.com>
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>
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Sender: linux-kernel-owner@vger.kernel.org
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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.

>
> --
> Best Regards,
> Peter Chen


-- 
Baolin.wang
Best Regards