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

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Date:	Thu, 10 Mar 2016 17:41:22 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Lu Baolu <baolu.lu@...ux.intel.com>
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 Fri, Mar 11, 2016 at 08:20:43AM +0800, Lu Baolu wrote:
> 
> 
> 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.

Ah, totally missed it, sorry about that am not expecting that below a
diffstat.

greg k-h