netdev - [PATCH net-next v1 13/13] net: wwan: tmi: Add maintainers and documentation

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Date:   Tue, 22 Nov 2022 19:27:10 +0800
From:   Yanchao Yang <yanchao.yang@...iatek.com>
To:     Loic Poulain <loic.poulain@...aro.org>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev ML <netdev@...r.kernel.org>,
        kernel ML <linux-kernel@...r.kernel.org>
CC:     MTK ML <linux-mediatek@...ts.infradead.org>,
        Liang Lu <liang.lu@...iatek.com>,
        Haijun Liu <haijun.liu@...iatek.com>,
        Hua Yang <hua.yang@...iatek.com>,
        Ting Wang <ting.wang@...iatek.com>,
        Felix Chen <felix.chen@...iatek.com>,
        Mingliang Xu <mingliang.xu@...iatek.com>,
        Min Dong <min.dong@...iatek.com>,
        Aiden Wang <aiden.wang@...iatek.com>,
        Guohao Zhang <guohao.zhang@...iatek.com>,
        Chris Feng <chris.feng@...iatek.com>,
        Yanchao Yang <yanchao.yang@...iatek.com>,
        Lambert Wang <lambert.wang@...iatek.com>,
        Mingchuang Qiao <mingchuang.qiao@...iatek.com>,
        Xiayu Zhang <xiayu.zhang@...iatek.com>,
        Haozhe Chang <haozhe.chang@...iatek.com>,
        MediaTek Corporation <linuxwwan@...iatek.com>
Subject: [PATCH net-next v1 13/13] net: wwan: tmi: Add maintainers and documentation

From: MediaTek Corporation <linuxwwan@...iatek.com>

Adds maintainers and documentation for MediaTek TMI 5G WWAN modem
device driver.

Signed-off-by: Felix Chen <felix.chen@...iatek.com>
Signed-off-by: MediaTek Corporation <linuxwwan@...iatek.com>
---
 .../networking/device_drivers/wwan/index.rst  |  1 +
 .../networking/device_drivers/wwan/tmi.rst    | 48 +++++++++++++++++++
 MAINTAINERS                                   | 11 +++++
 3 files changed, 60 insertions(+)
 create mode 100644 Documentation/networking/device_drivers/wwan/tmi.rst

diff --git a/Documentation/networking/device_drivers/wwan/index.rst b/Documentation/networking/device_drivers/wwan/index.rst
index 370d8264d5dc..8298629b4d55 100644
--- a/Documentation/networking/device_drivers/wwan/index.rst
+++ b/Documentation/networking/device_drivers/wwan/index.rst
@@ -10,6 +10,7 @@ Contents:
 
    iosm
    t7xx
+   tmi
 
 .. only::  subproject and html
 
diff --git a/Documentation/networking/device_drivers/wwan/tmi.rst b/Documentation/networking/device_drivers/wwan/tmi.rst
new file mode 100644
index 000000000000..3655779bf692
--- /dev/null
+++ b/Documentation/networking/device_drivers/wwan/tmi.rst
@@ -0,0 +1,48 @@
+.. SPDX-License-Identifier: BSD-3-Clause-Clear
+
+.. Copyright (c) 2022, MediaTek Inc.
+
+.. _tmi_driver_doc:
+
+====================================================
+TMI driver for MTK PCIe based T-series 5G Modem
+====================================================
+The TMI(T-series Modem Interface) driver is a WWAN PCIe host driver developed
+for data exchange over PCIe interface between Host platform and MediaTek's
+T-series 5G modem. The driver exposes control plane and data plane interfaces
+to applications. The control plane provides device node interfaces for control
+data transactions. The data plane provides network link interfaces for IP data
+transactions.
+
+Control channel userspace ABI
+=============================
+/dev/wwan0at0 character device
+------------------------------
+The driver exposes an AT port by implementing AT WWAN Port.
+The userspace end of the control channel pipe is a /dev/wwan0at0 character
+device. Application shall use this interface to issue AT commands.
+
+/dev/wwan0mbim0 character device
+--------------------------------
+The driver exposes an MBIM interface to the MBIM function by implementing
+MBIM WWAN Port. The userspace end of the control channel pipe is a
+/dev/wwan0mbim0 character device. Applications shall use this interface
+for MBIM protocol communication.
+
+Data channel userspace ABI
+==========================
+wwan0-X network device
+----------------------
+The TMI driver exposes IP link interfaces "wwan0-X" of type "wwan" for IP
+traffic. Iproute network utility is used for creating "wwan0-X" network
+interfaces and for associating it with the MBIM IP session.
+
+The userspace management application is responsible for creating a new IP link
+prior to establishing an MBIM IP session where the SessionId is greater than 0.
+
+For example, creating a new IP link for an MBIM IP session with SessionId 1:
+
+  ip link add dev wwan0-1 parentdev wwan0 type wwan linkid 1
+
+The driver will automatically map the "wwan0-1" network device to MBIM IP
+session 1.
diff --git a/MAINTAINERS b/MAINTAINERS
index a96c60c787af..eac544b274ac 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13058,6 +13058,17 @@ L:	netdev@...r.kernel.org
 S:	Supported
 F:	drivers/net/wwan/t7xx/
 
+MEDIATEK TMI 5G WWAN MODEM DRIVER
+M:	Yanchao Yang <yanchao.yang@...iatek.com>
+M:	Min Dong <min.dong@...iatek.com>
+M:	MediaTek Corporation <linuxwwan@...iatek.com>
+R:	Liang Lu <liang.lu@...iatek.com>
+R:	Haijun Liu <haijun.liu@...iatek.com>
+R:	Lambert Wang <lambert.wang@...iatek.com>
+L:	netdev@...r.kernel.org
+S:	Supported
+F:	drivers/net/wwan/tmi/
+
 MEDIATEK USB3 DRD IP DRIVER
 M:	Chunfeng Yun <chunfeng.yun@...iatek.com>
 L:	linux-usb@...r.kernel.org
-- 
2.32.0