linux-kernel - Re: [PATCH v1 1/4] mhi_bus: core: Add support for MHI host interface

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Message-ID: <d7c9fdd2-6078-503a-517a-f20dd6d8098f@codeaurora.org>
Date:   Thu, 3 May 2018 20:05:04 -0700
From:   Sujeev Dias <sdias@...eaurora.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Tony Truong <truong@...eaurora.org>
Subject: Re: [PATCH v1 1/4] mhi_bus: core: Add support for MHI host interface

Hi Pavel


On 05/03/2018 12:21 PM, Pavel Machek wrote:
> Hi!
>
>> MHI Host Interface is a communication protocol to be used by the host
>> to control and communcate with modem over a high speed peripheral bus.
>> This module will allow host to communicate with external devices that
>> support MHI protocol.
> I have Motorola Droid 4 cellphone here, with Qualcomm GSM modem. But
> it talks over serial line and USB. I guess MHI is not applicable to my
> hardware?
>
MHI is for PCIe based modem, in any case I can't comment about 
commercial devices.
>> +MHI Devices
>> +-----------
>> +Logical device that bind to maximum of two physical MHI channels. Once MHI is in
>> +powered on state, each supported channel by controller will be allocated as a
>> +mhi_device.
> What kind of protocol is running over MHI? I guess its not AT
> commands. QMI? Or something entirely different?
All modem services between external modem and host go over MHI.
So QMI, AT, all other data and control services go thru MHI host driver.
> 									Pavel

Thanks
Sujeev

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