linux-kernel - Re: [PATCH] bus: mhi: Add Qcom WWAN control driver

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Message-ID: <20210308105059.22f6f038@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 8 Mar 2021 10:50:59 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Loic Poulain <loic.poulain@...aro.org>
Cc:     gregkh@...uxfoundation.org, manivannan.sadhasivam@...aro.org,
        hemantk@...eaurora.org, linux-arm-msm@...r.kernel.org,
        aleksander@...ksander.es, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bus: mhi: Add Qcom WWAN control driver

On Mon,  8 Mar 2021 19:40:51 +0100 Loic Poulain wrote:
> The MHI WWWAN control driver allows MHI Qcom based modems to expose
> different modem control protocols to userspace, so that userspace
> modem tools or daemon (e.g. ModemManager) can control WWAN config
> and state (APN config, SMS, provider selection...). A Qcom based
> modem can expose one or several of the following protocols:
> - AT: Well known AT commands interactive protocol (microcom, minicom...)
> - MBIM: Mobile Broadband Interface Model (libmbim, mbimcli)
> - QMI: Qcom MSM/Modem Interface (libqmi, qmicli)
> - QCDM: Qcom Modem diagnostic interface (libqcdm)
> - FIREHOSE: XML-based protocol for Modem firmware management
> 	    (qmi-firmware-update)
> 
> The different interfaces are exposed as character devices, in the same
> way as for USB modem variants.
> 
> Note that this patch is mostly a rework of the earlier MHI UCI
> tentative that was a generic interface for accessing MHI bus from
> userspace. As suggested, this new version is WWAN specific and is
> dedicated to only expose channels used for controlling a modem, and
> for which related opensource user support exist. Other MHI channels
> not fitting the requirements will request either to be plugged to
> the right Linux subsystem (when available) or to be discussed as a
> new MHI driver (e.g AI accelerator, WiFi debug channels, etc...).
> 
> Co-developed-by: Hemant Kumar <hemantk@...eaurora.org>
> Signed-off-by: Hemant Kumar <hemantk@...eaurora.org>
> Signed-off-by: Loic Poulain <loic.poulain@...aro.org>

You need to CC netdev.

>  drivers/bus/mhi/Kconfig     |  12 +
>  drivers/bus/mhi/Makefile    |   3 +
>  drivers/bus/mhi/wwan_ctrl.c | 559 ++++++++++++++++++++++++++++++++++++++++++++

Linux kernel tree is not organized by bus. This belongs somewhere under
drivers/net.