Re: [PATCH v3 0/7] usb: add support for Intel dual role port mux
From: Lu Baolu
Date: Thu Mar 10 2016 - 19:20:53 EST
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.
> greg k-h