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Date: Mon, 29 Sep 2014 08:58:45 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Wim Van Sebroeck <wim@...ana.be>
Cc: Beniamino Galvani <b.galvani@...il.com>,
linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v3] watchdog: add driver for Ricoh RN5T618 watchdog
I'm not sure why a) this patch was sent to me in the first place and
b) why anyone would think this should go in through MFD?
> You have my Acked-by or Signbed-off-by on this one.
> I believe this goes via the mfd tree.
Wim,
When you Ack something, you should add your full Acked-by string.
Patches should only be Signed-off(-by) when you are part of the
distribution path i.e. when you send patches to another Maintainer
and/or Linus.
> > 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>
> > Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> > ---
> >
> > Hi,
> >
> > this is the third version of Ricoh RN5T618 watchdog driver. The other
> > patches of the original series adding MFD and regulator support have
> > already been merged.
> >
> > Changes since v2 (http://lwn.net/Articles/610000/ ):
> > - rename 'heartbeat' module parameter to 'timeout'
> > - change parameter type to uint
> >
> > Changes since v1:
> > - initialized heartbeat parameter to 0 instead of -1
> > - simplified code path in set_timeout function
> > - fixed module unloading
> > - made 'time' unsigned in struct rn5t618_wdt_map
> >
> > drivers/watchdog/Kconfig | 11 +++
> > drivers/watchdog/Makefile | 1 +
> > drivers/watchdog/rn5t618_wdt.c | 198 +++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 210 insertions(+)
> > create mode 100644 drivers/watchdog/rn5t618_wdt.c
> >
> > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> > index 3ee951b..6fd5a87 100644
> > --- a/drivers/watchdog/Kconfig
> > +++ b/drivers/watchdog/Kconfig
> > @@ -327,6 +327,17 @@ 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 44f5d68..f105999 100644
> > --- a/drivers/watchdog/Makefile
> > +++ b/drivers/watchdog/Makefile
> > @@ -48,6 +48,7 @@ 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..d1c1227
> > --- /dev/null
> > +++ b/drivers/watchdog/rn5t618_wdt.c
> > @@ -0,0 +1,198 @@
> > +/*
> > + * 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 timeout;
> > +
> > +module_param(timeout, uint, 0);
> > +MODULE_PARM_DESC(timeout, "Initial watchdog timeout in seconds");
> > +
> > +module_param(nowayout, bool, 0);
> > +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
> > + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> > +
> > +struct rn5t618_wdt {
> > + struct watchdog_device wdt_dev;
> > + struct rn5t618 *rn5t618;
> > +};
> > +
> > +/*
> > + * This array encodes the values of WDOGTIM field for the supported
> > + * watchdog expiration times. If the watchdog is not accessed before
> > + * the timer expiration, the PMU generates an interrupt and if the CPU
> > + * doesn't clear it within one second the system is restarted.
> > + */
> > +static const struct {
> > + u8 reg_val;
> > + unsigned int time;
> > +} rn5t618_wdt_map[] = {
> > + { 0, 1 },
> > + { 1, 8 },
> > + { 2, 32 },
> > + { 3, 128 },
> > +};
> > +
> > +static int rn5t618_wdt_set_timeout(struct watchdog_device *wdt_dev,
> > + unsigned int t)
> > +{
> > + struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev);
> > + int ret, i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(rn5t618_wdt_map); i++) {
> > + if (rn5t618_wdt_map[i].time + 1 >= t)
> > + break;
> > + }
> > +
> > + if (i == ARRAY_SIZE(rn5t618_wdt_map))
> > + return -EINVAL;
> > +
> > + ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG,
> > + RN5T618_WATCHDOG_WDOGTIM_M,
> > + rn5t618_wdt_map[i].reg_val);
> > + if (!ret)
> > + wdt_dev->timeout = rn5t618_wdt_map[i].time;
> > +
> > + return ret;
> > +}
> > +
> > +static int rn5t618_wdt_start(struct watchdog_device *wdt_dev)
> > +{
> > + struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev);
> > + int ret;
> > +
> > + ret = rn5t618_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
> > + if (ret)
> > + return ret;
> > +
> > + /* enable repower-on */
> > + ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_REPCNT,
> > + RN5T618_REPCNT_REPWRON,
> > + RN5T618_REPCNT_REPWRON);
> > + if (ret)
> > + return ret;
> > +
> > + /* enable watchdog */
> > + ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG,
> > + RN5T618_WATCHDOG_WDOGEN,
> > + RN5T618_WATCHDOG_WDOGEN);
> > + if (ret)
> > + return ret;
> > +
> > + /* enable watchdog interrupt */
> > + return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_PWRIREN,
> > + RN5T618_PWRIRQ_IR_WDOG,
> > + RN5T618_PWRIRQ_IR_WDOG);
> > +}
> > +
> > +static int rn5t618_wdt_stop(struct watchdog_device *wdt_dev)
> > +{
> > + struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev);
> > +
> > + return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG,
> > + RN5T618_WATCHDOG_WDOGEN, 0);
> > +}
> > +
> > +static int rn5t618_wdt_ping(struct watchdog_device *wdt_dev)
> > +{
> > + struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev);
> > + unsigned int val;
> > + int ret;
> > +
> > + /* The counter is restarted after a R/W access to watchdog register */
> > + ret = regmap_read(wdt->rn5t618->regmap, RN5T618_WATCHDOG, &val);
> > + if (ret)
> > + return ret;
> > +
> > + ret = regmap_write(wdt->rn5t618->regmap, RN5T618_WATCHDOG, val);
> > + if (ret)
> > + return ret;
> > +
> > + /* Clear pending watchdog interrupt */
> > + return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_PWRIRQ,
> > + RN5T618_PWRIRQ_IR_WDOG, 0);
> > +}
> > +
> > +static struct watchdog_info rn5t618_wdt_info = {
> > + .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE |
> > + WDIOF_KEEPALIVEPING,
> > + .identity = DRIVER_NAME,
> > +};
> > +
> > +static struct watchdog_ops rn5t618_wdt_ops = {
> > + .owner = THIS_MODULE,
> > + .start = rn5t618_wdt_start,
> > + .stop = rn5t618_wdt_stop,
> > + .ping = rn5t618_wdt_ping,
> > + .set_timeout = rn5t618_wdt_set_timeout,
> > +};
> > +
> > +static int rn5t618_wdt_probe(struct platform_device *pdev)
> > +{
> > + struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent);
> > + struct rn5t618_wdt *wdt;
> > + int min_timeout, max_timeout;
> > +
> > + wdt = devm_kzalloc(&pdev->dev, sizeof(struct rn5t618_wdt), GFP_KERNEL);
> > + if (!wdt)
> > + return -ENOMEM;
> > +
> > + min_timeout = rn5t618_wdt_map[0].time;
> > + max_timeout = rn5t618_wdt_map[ARRAY_SIZE(rn5t618_wdt_map) - 1].time;
> > +
> > + wdt->rn5t618 = rn5t618;
> > + wdt->wdt_dev.info = &rn5t618_wdt_info;
> > + wdt->wdt_dev.ops = &rn5t618_wdt_ops;
> > + wdt->wdt_dev.min_timeout = min_timeout;
> > + wdt->wdt_dev.max_timeout = max_timeout;
> > + wdt->wdt_dev.timeout = max_timeout;
> > + wdt->wdt_dev.parent = &pdev->dev;
> > +
> > + watchdog_set_drvdata(&wdt->wdt_dev, wdt);
> > + watchdog_init_timeout(&wdt->wdt_dev, timeout, &pdev->dev);
> > + watchdog_set_nowayout(&wdt->wdt_dev, nowayout);
> > +
> > + platform_set_drvdata(pdev, wdt);
> > +
> > + return watchdog_register_device(&wdt->wdt_dev);
> > +}
> > +
> > +static int rn5t618_wdt_remove(struct platform_device *pdev)
> > +{
> > + struct rn5t618_wdt *wdt = platform_get_drvdata(pdev);
> > +
> > + watchdog_unregister_device(&wdt->wdt_dev);
> > +
> > + return 0;
> > +}
> > +
> > +static struct platform_driver rn5t618_wdt_driver = {
> > + .probe = rn5t618_wdt_probe,
> > + .remove = rn5t618_wdt_remove,
> > + .driver = {
> > + .name = DRIVER_NAME,
> > + },
> > +};
> > +
> > +module_platform_driver(rn5t618_wdt_driver);
> > +
> > +MODULE_AUTHOR("Beniamino Galvani <b.galvani@...il.com>");
> > +MODULE_DESCRIPTION("RN5T618 watchdog driver");
> > +MODULE_LICENSE("GPL v2");
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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