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Date: Wed, 13 Feb 2019 07:09:07 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
mazziesaccount@...il.com
Cc: heikki.haikola@...rohmeurope.com, mikko.mutanen@...rohmeurope.com,
lee.jones@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
broonie@...nel.org, gregkh@...uxfoundation.org, rafael@...nel.org,
mturquette@...libre.com, sboyd@...nel.org,
linus.walleij@...aro.org, bgolaszewski@...libre.com,
sre@...nel.org, lgirdwood@...il.com, a.zummo@...ertech.it,
alexandre.belloni@...tlin.com, wim@...ux-watchdog.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
linux-pm@...r.kernel.org, linux-rtc@...r.kernel.org,
linux-watchdog@...r.kernel.org, bogdan-petru.chircu-mare@....com
Subject: Re: [PATCH v9 8/8] watchdog: bd70528: Initial support for ROHM
BD70528 watchdog block
On 2/13/19 5:37 AM, Matti Vaittinen wrote:
> Initial support for watchdog block included in ROHM BD70528
> power management IC.
>
> Configurations for low power states are still to be checked.
>
> Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> Acked-by: Guenter Roeck <linux@...ck-us.net>
> ---
>
> I maintained the ack from Guenter as only change is to use function
> exported by MFD instead of pointer to function provided by MFD. Please
> let me know if this is not Ok.
>
NP. With functions exported by MFD, my choice would have been to handle
locking there as well with respective locking/unlocking functions exported.
But that is your call to make, not mine.
Guenter
> drivers/watchdog/Kconfig | 12 +++
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/bd70528_wdt.c | 190 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 203 insertions(+)
> create mode 100644 drivers/watchdog/bd70528_wdt.c
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 57f017d74a97..f30e3a3e886e 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -90,6 +90,18 @@ config SOFT_WATCHDOG_PRETIMEOUT
> watchdog. Be aware that governors might affect the watchdog because it
> is purely software, e.g. the panic governor will stall it!
>
> +config BD70528_WATCHDOG
> + tristate "ROHM BD70528 PMIC Watchdog"
> + depends on MFD_ROHM_BD70528
> + select WATCHDOG_CORE
> + help
> + Support for the watchdog in the ROHM BD70528 PMIC. Watchdog trigger
> + cause system reset.
> +
> + Say Y here to include support for the ROHM BD70528 watchdog.
> + Alternatively say M to compile the driver as a module,
> + which will be called bd70528_wdt.
> +
> config DA9052_WATCHDOG
> tristate "Dialog DA9052 Watchdog"
> depends on PMIC_DA9052 || COMPILE_TEST
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index a0917ef28e07..1ce87a3b1172 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -204,6 +204,7 @@ obj-$(CONFIG_WATCHDOG_SUN4V) += sun4v_wdt.o
> obj-$(CONFIG_XEN_WDT) += xen_wdt.o
>
> # Architecture Independent
> +obj-$(CONFIG_BD70528_WATCHDOG) += bd70528_wdt.o
> obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
> obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o
> obj-$(CONFIG_DA9062_WATCHDOG) += da9062_wdt.o
> diff --git a/drivers/watchdog/bd70528_wdt.c b/drivers/watchdog/bd70528_wdt.c
> new file mode 100644
> index 000000000000..5921be93c1ba
> --- /dev/null
> +++ b/drivers/watchdog/bd70528_wdt.c
> @@ -0,0 +1,190 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (C) 2018 ROHM Semiconductors
> +// ROHM BD70528MWV watchdog driver
> +
> +#include <linux/bcd.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/rohm-bd70528.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/watchdog.h>
> +
> +/*
> + * Max time we can set is 1 hour, 59 minutes and 59 seconds
> + * and Minimum time is 1 second
> + */
> +#define WDT_MAX_MS ((2 * 60 * 60 - 1) * 1000)
> +#define WDT_MIN_MS 1000
> +#define DEFAULT_TIMEOUT 60
> +
> +struct wdtbd70528 {
> + struct device *dev;
> + struct regmap *regmap;
> + struct mutex *rtc_lock;
> + struct watchdog_device wdt;
> +};
> +
> +static int bd70528_wdt_set_locked(struct wdtbd70528 *w, int enable)
> +{
> + struct bd70528 *bd70528;
> +
> + bd70528 = container_of(w->rtc_lock, struct bd70528, rtc_timer_lock);
> + return bd70528_wdt_set(bd70528, enable, NULL);
> +}
> +
> +static int bd70528_wdt_change(struct wdtbd70528 *w, int enable)
> +{
> + int ret;
> +
> + mutex_lock(w->rtc_lock);
> + ret = bd70528_wdt_set_locked(w, enable);
> + mutex_unlock(w->rtc_lock);
> +
> + return ret;
> +}
> +
> +static int bd70528_wdt_start(struct watchdog_device *wdt)
> +{
> + struct wdtbd70528 *w = watchdog_get_drvdata(wdt);
> +
> + dev_dbg(w->dev, "WDT ping...\n");
> + return bd70528_wdt_change(w, 1);
> +}
> +
> +static int bd70528_wdt_stop(struct watchdog_device *wdt)
> +{
> + struct wdtbd70528 *w = watchdog_get_drvdata(wdt);
> +
> + dev_dbg(w->dev, "WDT stopping...\n");
> + return bd70528_wdt_change(w, 0);
> +}
> +
> +static int bd70528_wdt_set_timeout(struct watchdog_device *wdt,
> + unsigned int timeout)
> +{
> + unsigned int hours;
> + unsigned int minutes;
> + unsigned int seconds;
> + int ret;
> + struct wdtbd70528 *w = watchdog_get_drvdata(wdt);
> +
> + seconds = timeout;
> + hours = timeout / (60 * 60);
> + /* Maximum timeout is 1h 59m 59s => hours is 1 or 0 */
> + if (hours)
> + seconds -= (60 * 60);
> + minutes = seconds / 60;
> + seconds = seconds % 60;
> +
> + mutex_lock(w->rtc_lock);
> +
> + ret = bd70528_wdt_set_locked(w, 0);
> + if (ret)
> + goto out_unlock;
> +
> + ret = regmap_update_bits(w->regmap, BD70528_REG_WDT_HOUR,
> + BD70528_MASK_WDT_HOUR, hours);
> + if (ret) {
> + dev_err(w->dev, "Failed to set WDT hours\n");
> + goto out_en_unlock;
> + }
> + ret = regmap_update_bits(w->regmap, BD70528_REG_WDT_MINUTE,
> + BD70528_MASK_WDT_MINUTE, bin2bcd(minutes));
> + if (ret) {
> + dev_err(w->dev, "Failed to set WDT minutes\n");
> + goto out_en_unlock;
> + }
> + ret = regmap_update_bits(w->regmap, BD70528_REG_WDT_SEC,
> + BD70528_MASK_WDT_SEC, bin2bcd(seconds));
> + if (ret)
> + dev_err(w->dev, "Failed to set WDT seconds\n");
> + else
> + dev_dbg(w->dev, "WDT tmo set to %u\n", timeout);
> +
> +out_en_unlock:
> + ret = bd70528_wdt_set_locked(w, 1);
> +out_unlock:
> + mutex_unlock(w->rtc_lock);
> +
> + return ret;
> +}
> +
> +static const struct watchdog_info bd70528_wdt_info = {
> + .identity = "bd70528-wdt",
> + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
> +};
> +
> +static const struct watchdog_ops bd70528_wdt_ops = {
> + .start = bd70528_wdt_start,
> + .stop = bd70528_wdt_stop,
> + .set_timeout = bd70528_wdt_set_timeout,
> +};
> +
> +static int bd70528_wdt_probe(struct platform_device *pdev)
> +{
> + struct bd70528 *bd70528;
> + struct wdtbd70528 *w;
> + int ret;
> + unsigned int reg;
> +
> + bd70528 = dev_get_drvdata(pdev->dev.parent);
> + if (!bd70528) {
> + dev_err(&pdev->dev, "No MFD driver data\n");
> + return -EINVAL;
> + }
> + w = devm_kzalloc(&pdev->dev, sizeof(*w), GFP_KERNEL);
> + if (!w)
> + return -ENOMEM;
> +
> + w->regmap = bd70528->chip.regmap;
> + w->rtc_lock = &bd70528->rtc_timer_lock;
> + w->dev = &pdev->dev;
> +
> + w->wdt.info = &bd70528_wdt_info;
> + w->wdt.ops = &bd70528_wdt_ops;
> + w->wdt.min_hw_heartbeat_ms = WDT_MIN_MS;
> + w->wdt.max_hw_heartbeat_ms = WDT_MAX_MS;
> + w->wdt.parent = pdev->dev.parent;
> + w->wdt.timeout = DEFAULT_TIMEOUT;
> + watchdog_set_drvdata(&w->wdt, w);
> + watchdog_init_timeout(&w->wdt, 0, pdev->dev.parent);
> +
> + ret = bd70528_wdt_set_timeout(&w->wdt, w->wdt.timeout);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to set the watchdog timeout\n");
> + return ret;
> + }
> +
> + mutex_lock(w->rtc_lock);
> + ret = regmap_read(w->regmap, BD70528_REG_WDT_CTRL, ®);
> + mutex_unlock(w->rtc_lock);
> +
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to get the watchdog state\n");
> + return ret;
> + }
> + if (reg & BD70528_MASK_WDT_EN) {
> + dev_dbg(&pdev->dev, "watchdog was running during probe\n");
> + set_bit(WDOG_HW_RUNNING, &w->wdt.status);
> + }
> +
> + ret = devm_watchdog_register_device(&pdev->dev, &w->wdt);
> + if (ret < 0)
> + dev_err(&pdev->dev, "watchdog registration failed: %d\n", ret);
> +
> + return ret;
> +}
> +static struct platform_driver bd70528_wdt = {
> + .driver = {
> + .name = "bd70528-wdt"
> + },
> + .probe = bd70528_wdt_probe,
> +};
> +
> +module_platform_driver(bd70528_wdt);
> +
> +MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@...rohmeurope.com>");
> +MODULE_DESCRIPTION("BD70528 watchdog driver");
> +MODULE_LICENSE("GPL");
>
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