linux-kernel - Re: [PATCH 2/2] USB: misc: Add driver for the WCH CH341 in I2C/GPIO mode

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Date:   Mon, 19 Apr 2021 19:32:40 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Frank Zago <frank@...o.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Jan-Niklas Burfeind <kernel@...ionpri.me>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Wolfram Sang <wsa@...nel.org>, Johan Hovold <johan@...nel.org>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/2] USB: misc: Add driver for the WCH CH341 in I2C/GPIO
 mode

Hi--

On 4/19/21 7:25 PM, Frank Zago wrote:
> From: frank zago <frank@...o.net>
> 

> 
> Signed-off-by: Frank Zago <frank@...o.net>
> Signed-off-by: frank zago <frank@...o.net>

Don't think you need both of those.

> ---
>  MAINTAINERS                         |   6 +
>  drivers/usb/misc/Kconfig            |  18 ++
>  drivers/usb/misc/Makefile           |   1 +
>  drivers/usb/misc/ch341/Kconfig      |   0
>  drivers/usb/misc/ch341/Makefile     |   3 +
>  drivers/usb/misc/ch341/ch341-core.c |  87 +++++++++
>  drivers/usb/misc/ch341/ch341-gpio.c | 249 ++++++++++++++++++++++++++
>  drivers/usb/misc/ch341/ch341-i2c.c  | 267 ++++++++++++++++++++++++++++
>  drivers/usb/misc/ch341/ch341.h      |  50 ++++++
>  9 files changed, 681 insertions(+)
>  create mode 100644 drivers/usb/misc/ch341/Kconfig
>  create mode 100644 drivers/usb/misc/ch341/Makefile
>  create mode 100644 drivers/usb/misc/ch341/ch341-core.c
>  create mode 100644 drivers/usb/misc/ch341/ch341-gpio.c
>  create mode 100644 drivers/usb/misc/ch341/ch341-i2c.c
>  create mode 100644 drivers/usb/misc/ch341/ch341.h
> 

> diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
> index 8f1144359012..2d4db92f0de4 100644
> --- a/drivers/usb/misc/Kconfig
> +++ b/drivers/usb/misc/Kconfig
> @@ -284,3 +284,21 @@ config BRCM_USB_PINMAP
>  	  This option enables support for remapping some USB external
>  	  signals, which are typically on dedicated pins on the chip,
>  	  to any gpio.
> +
> +config USB_CH341_CORE
> +	tristate "USB WinChipHead CH341 in I2C/SPI/GPIO mode"
> +	depends on USB && GPIOLIB && I2C && SPI
> +	help
> +
> +	  If you say yes to this option, support for the CH341 chips,
> +	  running in I2C/SPI/GPIO mode will be included. Some versions
> +	  of the chip do not support all the functionnalities but
> +	  there is no way to differentiate them. For instance the
> +	  CH341A and CH341B support everything while the CH341T can
> +	  only do I2C.
> +
> +	  The serial mode is not supported by this driver. Use the
> +	  CH341 USB serial driver.
> +
> +	  This driver can also be built as a module.  If so, the
> +	  module will be called ch341-buses.

Above should be in drivers/usb/misc/ch341/Kconfig file instead?

> diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile
> index 5f4e598573ab..95c0ca15b8c9 100644
> --- a/drivers/usb/misc/Makefile
> +++ b/drivers/usb/misc/Makefile
> @@ -32,3 +32,4 @@ obj-$(CONFIG_USB_CHAOSKEY)		+= chaoskey.o
>  obj-$(CONFIG_USB_SISUSBVGA)		+= sisusbvga/
>  obj-$(CONFIG_USB_LINK_LAYER_TEST)	+= lvstest.o
>  obj-$(CONFIG_BRCM_USB_PINMAP)		+= brcmstb-usb-pinmap.o
> +obj-$(CONFIG_USB_CH341_CORE)		+= ch341/
> diff --git a/drivers/usb/misc/ch341/Kconfig b/drivers/usb/misc/ch341/Kconfig
> new file mode 100644
> index 000000000000..e69de29bb2d1

Is that file (above) empty on purpose?

> diff --git a/drivers/usb/misc/ch341/Makefile b/drivers/usb/misc/ch341/Makefile
> new file mode 100644
> index 000000000000..7c6429e7a46e
> --- /dev/null
> +++ b/drivers/usb/misc/ch341/Makefile
> @@ -0,0 +1,3 @@
> +obj-$(CONFIG_USB_CH341_CORE) := ch341-buses.o
> +
> +ch341-buses-objs := ch341-core.o ch341-i2c.o ch341-gpio.o


-- 
~Randy