linux-kernel - RE: [PATCH v4 2/2] rtc: max31335: add driver support

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Message-ID: <CY4PR03MB3399426A31899901EBADDECF9BA7A@CY4PR03MB3399.namprd03.prod.outlook.com>
Date:   Wed, 1 Nov 2023 15:21:56 +0000
From:   "Miclaus, Antoniu" <Antoniu.Miclaus@...log.com>
To:     Guenter Roeck <linux@...ck-us.net>
CC:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>
Subject: RE: [PATCH v4 2/2] rtc: max31335: add driver support

> On Wed, Nov 01, 2023 at 11:48:14AM +0200, Antoniu Miclaus wrote:
> > RTC driver for MAX31335 ±2ppm Automotive Real-Time Clock with
> > Integrated MEMS Resonator.
> >
> > Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> > ---
> > changes in v4:
> >  - add Kconfig entry for HWMON dependency.
> >  MAINTAINERS                |   8 +
> >  drivers/rtc/Kconfig        |  20 +
> >  drivers/rtc/Makefile       |   1 +
> >  drivers/rtc/rtc-max31335.c | 765
> +++++++++++++++++++++++++++++++++++++
> >  4 files changed, 794 insertions(+)
> >  create mode 100644 drivers/rtc/rtc-max31335.c
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index dd5de540ec0b..bc484cb997ab 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -12823,6 +12823,14 @@ F:
> 	Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> >  F:	Documentation/hwmon/max31827.rst
> >  F:	drivers/hwmon/max31827.c
> >
> > +MAX31335 RTC DRIVER
> > +M:	Antoniu Miclaus <antoniu.miclaus@...log.com>
> > +L:	linux-rtc@...r.kernel.org
> > +S:	Supported
> > +W:	https://ez.analog.com/linux-software-drivers
> > +F:	Documentation/devicetree/bindings/rtc/adi,max31335.yaml
> > +F:	drivers/rtc/rtc-max31335.c
> > +
> >  MAX6650 HARDWARE MONITOR AND FAN CONTROLLER DRIVER
> >  L:	linux-hwmon@...r.kernel.org
> >  S:	Orphan
> > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> > index d7502433c78a..360da13fe61b 100644
> > --- a/drivers/rtc/Kconfig
> > +++ b/drivers/rtc/Kconfig
> > @@ -373,6 +373,26 @@ config RTC_DRV_MAX8997
> >  	  This driver can also be built as a module. If so, the module
> >  	  will be called rtc-max8997.
> >
> > +config RTC_DRV_MAX31335
> > +	tristate "Analog Devices MAX31335"
> > +	depends on I2C
> > +	select REGMAP_I2C
> > +	help
> > +	  If you say yes here you get support for the Analog Devices
> > +	  MAX31335.
> > +
> > +	  This driver can also be built as a module. If so, the module
> > +	  will be called rtc-max31335.
> > +
> > +config RTC_DRV_MAX31335_HWMON
> > +	bool "HWMON support for Analog Devices MAX31335"
> > +	depends on RTC_DRV_MAX31335 && HWMON
> > +	depends on !(RTC_DRV_MAX31335=y && HWMON=m)
> > +	default y
> > +	help
> > +	  Say Y here if you want to expose temperature sensor data on
> > +	  rtc-max31335.
> > +
> 
> This isn't used in the driver. Did you test with HWMON=n ?
> 

I need to start thinking a bit more out of the box instead of 
taking other driver approaches as being the only way to go. 😊

Will fix in v5.

> Guenter