linux-kernel - Re: [PATCH v1 1/1] mux: mux-intel-usb: Add Intel USB Multiplexer driver

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Date:   Tue, 30 May 2017 11:21:00 -0700
From:   sathyanarayanan kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Peter Rosin <peda@...ntia.se>,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sathyanarayanan Kuppuswamy Natarajan <sathyaosid@...il.com>
Subject: Re: [PATCH v1 1/1] mux: mux-intel-usb: Add Intel USB Multiplexer
 driver

Hi Andy,


On 05/30/2017 09:20 AM, Andy Shevchenko wrote:
> On Tue, May 30, 2017 at 3:47 AM,
> <sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
>> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>>
>> In some Intel SOCs, a single USB port is shared between USB device and
> SoCs
>
>> host controller and an internal mux is used to control the selection of
>> port by host/device controllers. This driver adds support for the USB
>> internal mux, and all consumers of this mux can use interfaces provided
>> by mux subsytem to control the state of the internal mux.
>> +config MUX_INTEL_USB
>> +       tristate "Intel USB Mux"
> It's indeed Intel's IP?
Register map to control this MUX comes from Intel vendor defined XHCI 
extended cap region of SOC.
> I would rather believe that it is some 3rd
> party known IP block with platform specific soldering.
I don't think its platform specific support. I believe its a SOC 
specific thing( mainly for CHT and APL SoCs).
>

-- 
Sathyanarayanan Kuppuswamy
Linux kernel developer