[RFC 2/4] mfd: add Gateworks System Controller core driver

Randy Dunlap
2018-02-28T02:00:25Z

On 02/27/2018 05:21 PM, Tim Harvey wrote:
> The Gateworks System Controller (GSC) is an I2C slave controller
> implemented with an MSP430 micro-controller whose firmware embeds the
> following features:
> - I/O expander (16 GPIO's) using PCA955x protocol
> - Real Time Clock using DS1672 protocol
> - User EEPROM using AT24 protocol
> - HWMON using custom protocol
> - Interrupt controller with tamper detect, user pushbotton
> - Watchdog controller capable of full board power-cycle
> - Power Control capable of full board power-cycle
>
> see http://trac.gateworks.com/wiki/gsc for more details
>
> Signed-off-by: Tim Harvey <tharvey@gateworks.com>
> ---
> drivers/mfd/Kconfig | 10 ++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/gsc.c | 330 ++++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/gsc.h | 79 ++++++++++++
> 4 files changed, 420 insertions(+)
> create mode 100644 drivers/mfd/gsc.c
> create mode 100644 include/linux/mfd/gsc.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 1d20a80..16dd486 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -341,6 +341,16 @@ config MFD_EXYNOS_LPASS
> Select this option to enable support for Samsung Exynos Low Power
> Audio Subsystem.
>
> +config MFD_GSC
> + tristate "Gateworks System Controller"
> + depends on (I2C && OF) || COMPILE_TEST

Do both I2C and OF have stubs so that a driver will build when they are
both disabled? I.e., only COMPILE_TEST is enabled?

> + select MFD_CORE
> + select REGMAP_I2C
> + select REGMAP_IRQ
> + help
> + Enable support for the Gateworks System Controller found
> + on Gateworks Single Board Computers.
> +
> config MFD_MC13XXX
> tristate
> depends on (SPI_MASTER || I2C)
thanks,
--
~Randy