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Date:   Sat, 15 Jan 2022 15:53:28 +0100
From:   Loic Poulain <>
To:     Ricardo Martinez <>
Subject: Re: [PATCH net-next v4 00/13] net: wwan: t7xx: PCIe driver for
 MediaTek M.2 modem

On Fri, 14 Jan 2022 at 02:06, Ricardo Martinez
<> wrote:
> t7xx is the PCIe host device driver for Intel 5G 5000 M.2 solution which
> is based on MediaTek's T700 modem to provide WWAN connectivity.
> The driver uses the WWAN framework infrastructure to create the following
> control ports and network interfaces:
> * /dev/wwan0mbim0 - Interface conforming to the MBIM protocol.
>   Applications like libmbim [1] or Modem Manager [2] from v1.16 onwards
>   with [3][4] can use it to enable data communication towards WWAN.
> * /dev/wwan0at0 - Interface that supports AT commands.
> * wwan0 - Primary network interface for IP traffic.
> The main blocks in t7xx driver are:
> * PCIe layer - Implements probe, removal, and power management callbacks.
> * Port-proxy - Provides a common interface to interact with different types
>   of ports such as WWAN ports.
> * Modem control & status monitor - Implements the entry point for modem
>   initialization, reset and exit, as well as exception handling.
> * CLDMA (Control Layer DMA) - Manages the HW used by the port layer to send
>   control messages to the modem using MediaTek's CCCI (Cross-Core
>   Communication Interface) protocol.
> * DPMAIF (Data Plane Modem AP Interface) - Controls the HW that provides
>   uplink and downlink queues for the data path. The data exchange takes
>   place using circular buffers to share data buffer addresses and metadata
>   to describe the packets.
> * MHCCIF (Modem Host Cross-Core Interface) - Provides interrupt channels
>   for bidirectional event notification such as handshake, exception, PM and
>   port enumeration.
> The compilation of the t7xx driver is enabled by the CONFIG_MTK_T7XX config
> option which depends on CONFIG_WWAN.
> This driver was originally developed by MediaTek. Intel adapted t7xx to
> the WWAN framework, optimized and refactored the driver source in close
> collaboration with MediaTek. This will enable getting the t7xx driver on
> Approved Vendor List for interested OEM's and ODM's productization plans
> with Intel 5G 5000 M.2 solution.

>From a WWAN framework perspective:

Reviewed-by: Loic Poulain <>

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