The Congatec Board Controller is a microcontroller embedded on the x86 SoM of Congatec. It's able to manage lots of features, such as a watchdog, some GPIOs, I2C busses ... There is no datasheet or specific documentation for this Board Controller. The only sources of information are the driver, library and tools provided by Congatec in their yocto metalayer [1]. The Congatec implementation (available in [1]) doesn't follow the good practice (a unique driver, and all accesses are done using custom ioctls). This series implements an mfd driver, a gpio driver, a watchdog driver and an I2C bus driver, to use the standard API from userspace. For now, only the conga-SA7 module [2] is supported. For this board, the Board Controller has: - Two I2C busses - 14 GPIOs - A wathdog (with pretimeout support) It also has temperature, voltage and fan sensors. They will be supported later. For the development, the conga-SEVAL board [3] was used. With this board you have access to the 14 GPIOs, and the two I2C busses. On each I2C bus, a 24c16 EEPROM is present by default. To be able to drive GPIO 4, 5 and 6, a specific BIOS configuration is needed: HD audio shall be disabled, and they shall be set in GPIO mode. [1] https://git.congatec.com/x86/meta-congatec-x86/ [2] https://www.congatec.com/fileadmin/user_upload/Documents/Manual/SA70.pdf [3] https://www.congatec.com/fileadmin/user_upload/Documents/Manual/SEVAL.pdf Signed-off-by: Thomas Richard <thomas.richard@xxxxxxxxxxx> --- Thomas Richard (5): mfd: add Congatec Board Controller mfd driver gpio: Congatec Board Controller gpio driver i2c: Congatec Board Controller i2c bus driver watchdog: Congatec Board Controller watchdog timer driver MAINTAINERS: Add entry for Congatec Board Controller MAINTAINERS | 9 + drivers/gpio/Kconfig | 10 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-cgbc.c | 203 +++++++++++++++++++ drivers/i2c/busses/Kconfig | 10 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-cgbc.c | 407 +++++++++++++++++++++++++++++++++++++ drivers/mfd/Kconfig | 12 ++ drivers/mfd/Makefile | 1 + drivers/mfd/cgbc-core.c | 453 ++++++++++++++++++++++++++++++++++++++++++ drivers/watchdog/Kconfig | 10 + drivers/watchdog/Makefile | 1 + drivers/watchdog/cgbc_wdt.c | 217 ++++++++++++++++++++ include/linux/mfd/cgbc.h | 44 ++++ 14 files changed, 1379 insertions(+) --- base-commit: d31d4ea2a5e337e60f6da9a90e41d4061bdcec91 change-id: 20240503-congatec-board-controller-82c6b84cd4ea Best regards, -- Thomas Richard <thomas.richard@xxxxxxxxxxx>
