linux-kernel - Re: [PATCH 3/4] watchdog: add driver for Ricoh RN5T618 watchdog

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Date:	Sun, 28 Sep 2014 22:36:46 +0200
From:	Wim Van Sebroeck <wim@...ana.be>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Beniamino Galvani <b.galvani@...il.com>,
	linux-kernel@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Carlo Caione <carlo@...one.org>
Subject: Re: [PATCH 3/4] watchdog: add driver for Ricoh RN5T618 watchdog

Hi Lee,

> Still waiting on a Watchdog Ack, so I can take this set in.
> 
> > This adds a driver for the watchdog timer available in Ricoh RN5T618
> > PMIC. The device supports a programmable expiration time of 1, 8, 32
> > or 128 seconds.
> > 
> > Signed-off-by: Beniamino Galvani <b.galvani@...il.com>
> > ---
> >  drivers/watchdog/Kconfig       |   11 +++
> >  drivers/watchdog/Makefile      |    1 +
> >  drivers/watchdog/rn5t618_wdt.c |  196 ++++++++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/rn5t618.h    |    4 +
> >  4 files changed, 212 insertions(+)
> >  create mode 100644 drivers/watchdog/rn5t618_wdt.c
> > 
> > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> > index f57312f..9eba6af 100644
> > --- a/drivers/watchdog/Kconfig
> > +++ b/drivers/watchdog/Kconfig
> > @@ -309,6 +309,17 @@ config ORION_WATCHDOG
> >  	  To compile this driver as a module, choose M here: the
> >  	  module will be called orion_wdt.
> >  
> > +config RN5T618_WATCHDOG
> > +	tristate "Ricoh RN5T618 watchdog"
> > +	depends on MFD_RN5T618
> > +	select WATCHDOG_CORE
> > +	help
> > +	  If you say yes here you get support for watchdog on the Ricoh
> > +	  RN5T618 PMIC.
> > +
> > +	  This driver can also be built as a module.  If so, the module
> > +	  will be called rn5t618_wdt.
> > +
> >  config SUNXI_WATCHDOG
> >  	tristate "Allwinner SoCs watchdog support"
> >  	depends on ARCH_SUNXI
> > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> > index 468c320..0afa343 100644
> > --- a/drivers/watchdog/Makefile
> > +++ b/drivers/watchdog/Makefile
> > @@ -47,6 +47,7 @@ obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o
> >  obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
> >  obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o
> >  obj-$(CONFIG_SUNXI_WATCHDOG) += sunxi_wdt.o
> > +obj-$(CONFIG_RN5T618_WATCHDOG) += rn5t618_wdt.o
> >  obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
> >  obj-$(CONFIG_STMP3XXX_RTC_WATCHDOG) += stmp3xxx_rtc_wdt.o
> >  obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
> > diff --git a/drivers/watchdog/rn5t618_wdt.c b/drivers/watchdog/rn5t618_wdt.c
> > new file mode 100644
> > index 0000000..3a76ad7
> > --- /dev/null
> > +++ b/drivers/watchdog/rn5t618_wdt.c
> > @@ -0,0 +1,196 @@
> > +/*
> > + * Watchdog driver for Ricoh RN5T618 PMIC
> > + *
> > + * Copyright (C) 2014 Beniamino Galvani <b.galvani@...il.com>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License
> > + * version 2 as published by the Free Software Foundation.
> > + *
> > + * You should have received a copy of the GNU General Public License
> > + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#include <linux/device.h>
> > +#include <linux/mfd/rn5t618.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/watchdog.h>
> > +
> > +#define DRIVER_NAME "rn5t618-wdt"
> > +
> > +static bool nowayout = WATCHDOG_NOWAYOUT;
> > +static unsigned int heartbeat = -1;
> > +
> > +module_param(heartbeat, int, 0);
> > +MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds");
> > +

These are the comments I just mailed:
1) this is actually a timeout value and not the same as the heartbeat of the watchdog device.
So I prefer this also to be called as timeout and not heartbeat.
2) this actually is an unsigned int.

For the rest OK by me.

Kind regards,
Wim.

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