linux-kernel - [PATCH v4 0/3] WCH CH341 GPIO and SPI support

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Message-Id: <20220321042142.69239-1-frank@zago.net>
Date:   Sun, 20 Mar 2022 23:21:39 -0500
From:   frank zago <frank@...o.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Wolfram Sang <wsa@...nel.org>, Johan Hovold <johan@...nel.org>,
        linux-usb@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org,
        frank zago <frank@...o.net>
Subject: [PATCH v4 0/3] WCH CH341 GPIO and SPI support

The CH341 is a multifunction chip, presenting 3 different USB PID. One
of these functions is for I2C/SPI/GPIO. This new set of drivers will
manage I2C and GPIO.


Changes from v3:
  - really converted to an MFD driver. Driver is now split into 3
    modules (MFD+I2C+GPIO).
  - minor code cleanups

Changes from v2:
  - bug fixes
  - more robust USB enumeration
  - Changed to an MFD driver as suggested

During testing I found that i2c handles hot removal, but not gpio. The
gpio subsystem will complain with 'REMOVING GPIOCHIP WITH GPIOS STILL
REQUESTED', but it's a gpiolib issue.

Changes from v1:
  - Removed double Signed-off-by
  - Move Kconfig into the same directory as the driver


frank zago (3):
  mfd: ch341: add core driver for the WCH CH341 in I2C/GPIO mode
  gpio: ch341: add MFD cell driver for the CH341
  i2c: ch341: add MFD cell driver CH341 for I2C

 Documentation/misc-devices/ch341.rst | 114 ++++++++
 Documentation/misc-devices/index.rst |   1 +
 MAINTAINERS                          |   9 +
 drivers/gpio/Kconfig                 |  10 +
 drivers/gpio/Makefile                |   1 +
 drivers/gpio/gpio-ch341.c            | 421 +++++++++++++++++++++++++++
 drivers/i2c/busses/Kconfig           |  10 +
 drivers/i2c/busses/Makefile          |   1 +
 drivers/i2c/busses/i2c-ch341.c       | 325 +++++++++++++++++++++
 drivers/mfd/Kconfig                  |  12 +
 drivers/mfd/Makefile                 |   1 +
 drivers/mfd/ch341-core.c             | 109 +++++++
 include/linux/mfd/ch341.h            |  25 ++
 13 files changed, 1039 insertions(+)
 create mode 100644 Documentation/misc-devices/ch341.rst
 create mode 100644 drivers/gpio/gpio-ch341.c
 create mode 100644 drivers/i2c/busses/i2c-ch341.c
 create mode 100644 drivers/mfd/ch341-core.c
 create mode 100644 include/linux/mfd/ch341.h

--
2.32.0