linux-kernel - Re: [PATCH 1/3] mfd: ds1374: Introduce Dallas/Maxim DS1374 MFD core driver

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Date:   Mon, 22 Jun 2020 12:14:13 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Johnson CH Chen (陳昭勳) 
        <JohnsonCH.Chen@...a.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        "linux@...ck-us.net" <linux@...ck-us.net>
Subject: Re: [PATCH 1/3] mfd: ds1374: Introduce Dallas/Maxim DS1374 MFD core
 driver

On Mon, 22 Jun 2020, Johnson CH Chen (陳昭勳) wrote:

> Dallas/Maxim DS1374 is a counter designed to continuously count
> time in seconds. It provides an I2C interface to the host to
> access RTC clock or Alarm/Watchdog timer.
> 
> Add MFD Core driver, supporting the I2C communication to RTC and
> Watchdog devices.
> 
> Signed-off-by: Johnson Chen <johnsonch.chen@...a.com>
> ---
>  drivers/mfd/Kconfig  |  11 +++++
>  drivers/mfd/Makefile |   2 +
>  drivers/mfd/ds1374.c | 101 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 114 insertions(+)
>  create mode 100644 drivers/mfd/ds1374.c

Not sure I see the point of this driver.

How/where is the device part registered?

Is it DT only?  If not, what else?

Also where are the bindings?

> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 687e9c848053w.d16031f4b487 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1980,6 +1980,17 @@ config MFD_STM32_LPTIMER
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called stm32-lptimer.
>  
> +config MFD_DS1374
> +	tristate "Support for Dallas/Maxim DS1374"
> +	depends on I2C
> +	select MFD_CORE
> +	help
> +	  Say yes here to add support for Dallas/Maxim DS1374 Semiconductor.
> +	  This driver provides RTC and watchdog.
> +
> +	  This driver can also be built as a module. If so, module will be
> +	  called ds1374.
> +
>  config MFD_STM32_TIMERS
>  	tristate "Support for STM32 Timers"
>  	depends on (ARCH_STM32 && OF) || COMPILE_TEST

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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