linux-kernel - Re: [PATCH v5 1/5] usb: Add support for Intel LJCA device

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Message-ID: <20230313170341.GV9667@google.com>
Date:   Mon, 13 Mar 2023 17:03:41 +0000
From:   Lee Jones <lee@...nel.org>
To:     Ye Xiang <xiang.ye@...el.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Matthias Kaehlcke <mka@...omium.org>,
        Wolfram Sang <wsa@...nel.org>,
        Tyrone Ting <kfting@...oton.com>,
        Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>, linux-usb@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-gpio@...r.kernel.org,
        srinivas.pandruvada@...el.com, heikki.krogerus@...ux.intel.com,
        andriy.shevchenko@...ux.intel.com, sakari.ailus@...ux.intel.com,
        zhifeng.wang@...el.com, wentong.wu@...el.com, lixu.zhang@...el.com
Subject: Re: [PATCH v5 1/5] usb: Add support for Intel LJCA device

On Mon, 13 Mar 2023, Ye Xiang wrote:

> This patch implements the USB part of Intel USB-I2C/GPIO/SPI adapter
> device named "La Jolla Cove Adapter" (LJCA).
>
> The communication between the various LJCA module drivers and the
> hardware will be muxed/demuxed by this driver. The sub-module of
> LJCA can use ljca_transfer() to issue a transfer between host
> and hardware.
>
> Each sub-module of LJCA device is identified by type field within
> the LJCA message header.
>
> The minimum code in ASL that covers this board is
> Scope (\_SB.PCI0.DWC3.RHUB.HS01)
>     {
>         Device (GPIO)
>         {
>             Name (_ADR, Zero)
>             Name (_STA, 0x0F)
>         }
>
>         Device (I2C)
>         {
>             Name (_ADR, One)
>             Name (_STA, 0x0F)
>         }
>
>         Device (SPI)
>         {
>             Name (_ADR, 0x02)
>             Name (_STA, 0x0F)
>         }
>     }
>
> Signed-off-by: Ye Xiang <xiang.ye@...el.com>
> Reviewed-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> ---
>  drivers/usb/misc/Kconfig  |  13 +
>  drivers/usb/misc/Makefile |   1 +
>  drivers/usb/misc/ljca.c   | 998 ++++++++++++++++++++++++++++++++++++++
>  include/linux/usb/ljca.h  |  95 ++++
>  4 files changed, 1107 insertions(+)
>  create mode 100644 drivers/usb/misc/ljca.c
>  create mode 100644 include/linux/usb/ljca.h
>
> diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
> index a5f7652db7da..59ec120c26d4 100644
> --- a/drivers/usb/misc/Kconfig
> +++ b/drivers/usb/misc/Kconfig
> @@ -273,6 +273,19 @@ config USB_LINK_LAYER_TEST
>  	  Layer Test Device. Say Y only when you want to conduct USB Super Speed
>  	  Link Layer Test for host controllers.
>
> +config USB_LJCA
> +	tristate "Intel La Jolla Cove Adapter support"
> +	select MFD_CORE
> +	depends on USB
> +	help
> +	  This adds support for Intel La Jolla Cove USB-I2C/SPI/GPIO
> +	  Master Adapter (LJCA). Additional drivers such as I2C_LJCA,
> +	  GPIO_LJCA and SPI_LJCA must be enabled in order to use the
> +	  functionality of the device.
> +
> +	  This driver can also be built as a module. If so, the module
> +	  will be called ljca.
> +
>  config USB_CHAOSKEY
>  	tristate "ChaosKey random number generator driver support"
>  	depends on HW_RANDOM
> diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile
> index 93581baec3a8..6f6adfbe17e0 100644
> --- a/drivers/usb/misc/Makefile
> +++ b/drivers/usb/misc/Makefile
> @@ -29,6 +29,7 @@ obj-$(CONFIG_USB_HUB_USB251XB)		+= usb251xb.o
>  obj-$(CONFIG_USB_HSIC_USB3503)		+= usb3503.o
>  obj-$(CONFIG_USB_HSIC_USB4604)		+= usb4604.o
>  obj-$(CONFIG_USB_CHAOSKEY)		+= chaoskey.o
> +obj-$(CONFIG_USB_LJCA)			+= ljca.o
>
>  obj-$(CONFIG_USB_SISUSBVGA)		+= sisusbvga/
>  obj-$(CONFIG_USB_LINK_LAYER_TEST)	+= lvstest.o
> diff --git a/drivers/usb/misc/ljca.c b/drivers/usb/misc/ljca.c
> new file mode 100644
> index 000000000000..ab98deaf0074
> --- /dev/null
> +++ b/drivers/usb/misc/ljca.c
> @@ -0,0 +1,998 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Intel La Jolla Cove Adapter USB driver
> + *
> + * Copyright (c) 2023, Intel Corporation.
> + */
> +
> +#include <linux/dev_printk.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/core.h>

Please don't use the MFD API outside of drivers/mfd.

If you wish to use the API, please do.

Strip out (only) the MFD parts and move them into drivers/mfd.

> +#include <linux/module.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/types.h>
> +#include <linux/usb.h>
> +#include <linux/usb/ljca.h>

--
Lee Jones [李琼斯]