netdev - Re: [PATCH net-next v1 01/13] net: wwan: tmi: Add PCIe core

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Date:   Sun, 4 Dec 2022 22:52:38 +0400
From:   Sergey Ryazanov <ryazanov.s.a@...il.com>
To:     Yanchao Yang <yanchao.yang@...iatek.com>
Cc:     Loic Poulain <loic.poulain@...aro.org>,
        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>,
        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>,
        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: Re: [PATCH net-next v1 01/13] net: wwan: tmi: Add PCIe core

Hello Yanchao,

On 22.11.2022 15:11, Yanchao Yang wrote:
> From: MediaTek Corporation <linuxwwan@...iatek.com>
> 
> Registers the TMI device driver with the kernel. Set up all the fundamental
> configurations for the device: PCIe layer, Modem Host Cross Core Interface
> (MHCCIF), Reset Generation Unit (RGU), modem common control operations and
> build infrastructure.
> 
> * PCIe layer code implements driver probe and removal, MSI-X interrupt
> initialization and de-initialization, and the way of resetting the device.
> * MHCCIF provides interrupt channels to communicate events such as handshake,
> PM and port enumeration.
> * RGU provides interrupt channels to generate notifications from the device
> so that the TMI driver could get the device reset.
> * Modem common control operations provide the basic read/write functions of
> the device's hardware registers, mask/unmask/get/clear functions of the
> device's interrupt registers and inquiry functions of the device's status.
> 
> Signed-off-by: Ting Wang <ting.wang@...iatek.com>
> Signed-off-by: MediaTek Corporation <linuxwwan@...iatek.com>
> ---
>   drivers/net/wwan/Kconfig                 |   11 +
>   drivers/net/wwan/Makefile                |    1 +
>   drivers/net/wwan/mediatek/Makefile       |   12 +
>   drivers/net/wwan/mediatek/mtk_common.h   |   30 +
>   drivers/net/wwan/mediatek/mtk_dev.c      |   50 +
>   drivers/net/wwan/mediatek/mtk_dev.h      |  503 ++++++++++
>   drivers/net/wwan/mediatek/pcie/mtk_pci.c | 1164 ++++++++++++++++++++++
>   drivers/net/wwan/mediatek/pcie/mtk_pci.h |  150 +++
>   drivers/net/wwan/mediatek/pcie/mtk_reg.h |   69 ++
>   9 files changed, 1990 insertions(+)
>   create mode 100644 drivers/net/wwan/mediatek/Makefile
>   create mode 100644 drivers/net/wwan/mediatek/mtk_common.h
>   create mode 100644 drivers/net/wwan/mediatek/mtk_dev.c
>   create mode 100644 drivers/net/wwan/mediatek/mtk_dev.h
>   create mode 100644 drivers/net/wwan/mediatek/pcie/mtk_pci.c
>   create mode 100644 drivers/net/wwan/mediatek/pcie/mtk_pci.h
>   create mode 100644 drivers/net/wwan/mediatek/pcie/mtk_reg.h
> 
> diff --git a/drivers/net/wwan/Kconfig b/drivers/net/wwan/Kconfig
> index 3486ffe94ac4..a93a0c511d50 100644
> --- a/drivers/net/wwan/Kconfig
> +++ b/drivers/net/wwan/Kconfig
> @@ -119,6 +119,17 @@ config MTK_T7XX
>   
>   	  If unsure, say N.
>   
> +config MTK_TMI
> +	tristate "TMI Driver for Mediatek T-series Device"
> +	depends on PCI
> +	help
> +	  This driver enables Mediatek T-series WWAN Device communication.
> +
> +	  If you have one of those Mediatek T-series WWAN Modules and wish to
> +	  use it in Linux say Y/M here.

 From this and the series descriptions, it is unclear which modem chips 
this driver is intended for and how does it correlate with the T7xx 
driver? Is the TMI driver a drop-in replacement for the t7xx driver, or 
does the TMI driver support any T-series chips except t7xx?

> +
> +	  If unsure, say N.
> +
>   endif # WWAN
>   
>   endmenu
> diff --git a/drivers/net/wwan/Makefile b/drivers/net/wwan/Makefile
> index 3960c0ae2445..198d8074851f 100644
> --- a/drivers/net/wwan/Makefile
> +++ b/drivers/net/wwan/Makefile
> @@ -14,3 +14,4 @@ obj-$(CONFIG_QCOM_BAM_DMUX) += qcom_bam_dmux.o
>   obj-$(CONFIG_RPMSG_WWAN_CTRL) += rpmsg_wwan_ctrl.o
>   obj-$(CONFIG_IOSM) += iosm/
>   obj-$(CONFIG_MTK_T7XX) += t7xx/
> +obj-$(CONFIG_MTK_TMI) += mediatek/

The driver is called mtk_tmi, but its code is placed to the directory 
with too generic name 'mediatek'. Do you plan too keep all possible 
future drivers in this directory?

--
Sergey