linux-kernel - Re: [RFC 2/4] mfd: add Gateworks System Controller core driver

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Message-ID: <170c83e1-8a34-5103-3767-139b22081cf9@infradead.org>
Date:   Tue, 27 Feb 2018 18:00:25 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Tim Harvey <tharvey@...eworks.com>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-hwmon@...r.kernel.org,
        linux-input@...r.kernel.org
Subject: Re: [RFC 2/4] mfd: add Gateworks System Controller core driver

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@...eworks.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