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    Subject[PATCH v8 8/8] watchdog: bd70528: Initial support for ROHM BD70528 watchdog block
    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@fi.rohmeurope.com>
    Acked-by: Guenter Roeck <linux@roeck-us.net>
    ---
    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..cab802ddde06
    --- /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_set(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_set(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_set(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, &reg);
    + 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@fi.rohmeurope.com>");
    +MODULE_DESCRIPTION("BD70528 watchdog driver");
    +MODULE_LICENSE("GPL");
    --
    2.14.3

    --
    Matti Vaittinen, Linux device drivers
    ROHM Semiconductors, Finland SWDC
    Kiviharjunlenkki 1E
    90220 OULU
    FINLAND

    ~~~ "I don't think so," said Rene Descartes. Just then, he vanished ~~~

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