linux-kernel - Re: [PATCH v3 0/7] usb: add support for Intel dual role port mux

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Message-ID: <56E20F5B.3050204@linux.intel.com>
Date:	Fri, 11 Mar 2016 08:20:43 +0800
From:	Lu Baolu <baolu.lu@...ux.intel.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Felipe Balbi <balbi@...nel.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Lee Jones <lee.jones@...aro.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/7] usb: add support for Intel dual role port mux



On 03/11/2016 08:03 AM, Greg Kroah-Hartman wrote:
> On Tue, Mar 08, 2016 at 03:53:41PM +0800, Lu Baolu wrote:
>> Intel SOC chips are featured with USB dual role. The host role is
>> provided by Intel xHCI IP, and the gadget role is provided by IP
>> from designware. Tablet platform designs always share a single
>> port for both host and gadget controllers. There is a mux to
>> switch the port to the right controller according to the cable
>> type. OS needs to provide the callback to control the mux when
>> a plug-in event raises. The method to control the mux is platform
>> dependent. At least three types of implementation can be found
>> across current devices. 1) GPIO pins; 2) a unit which can be
>> controlled by memory mapped registers; 3) ACPI ASL code.
>>
>> This patch series adds supports for Intel dual role port mux.
>> It includes:
>> (1) A helper layer on top of extcon for individual mux driver.
>>     It listens to the USB-HOST extcon cable and call the switch
>>     call-back when the cable state changes.
>> (2) Drivers for GPIO controlled port mux which could be found on
>>     Baytrail devices. A mfd driver is used to split the GPIOs into
>>     USB gpio extcon device and a USB mux device. Driver for USB
>>     gpio extcon device is already in upstream Linux. This patch
>>     series includes a driver for GPIO USB mux.
>> (3) Drivers for USB port mux controlled through memory mapped
>>     registers and the logic to create the mux device. This type
>>     of dual role port mux could be found in Cherry Trail and
>>     Broxton devices.
>>
>> Lu Baolu (7):
>>   extcon: usb-gpio: add device binding for platform device
>>   extcon: usb-gpio: add support for ACPI gpio interface
>>   usb: mux: add common code for Intel dual role port mux
>>   usb: mux: add driver for Intel gpio controlled port mux
>>   usb: mux: add driver for Intel drcfg controlled port mux
>>   usb: pci-quirks: add Intel USB drcfg mux device
>>   mfd: intel_vuport: Add Intel virtual USB port MFD Driver
> You don't describe here what you changed from v2, or even from v1.
> Please always be specific, we don't remember what your last submissions
> looked like at all...

I am sorry. I put the change log after file change summary.
I will move it up here next time.

Best regards,
Baolu

>
> thanks,
>
> greg k-h
>