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Message-ID: <8ce6ed51-7963-0279-f771-66226e6b5a6d@roeck-us.net>
Date: Mon, 11 Oct 2021 10:17:46 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Luca Ceresoli <luca@...aceresoli.net>, linux-kernel@...r.kernel.org
Cc: Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Chanwoo Choi <cw00.choi@...sung.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Wim Van Sebroeck <wim@...ux-watchdog.org>,
devicetree@...r.kernel.org, linux-rtc@...r.kernel.org,
linux-watchdog@...r.kernel.org,
Chiwoong Byun <woong.byun@...sung.com>,
Laxman Dewangan <ldewangan@...dia.com>
Subject: Re: [PATCH 7/8] watchdog: max77714: add driver for the watchdog in
the MAX77714 PMIC
On 10/11/21 8:56 AM, Luca Ceresoli wrote:
> Add a simple driver to suppor the watchdog embedded in the Maxim MAX77714
> PMIC.
>
> Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>
> ---
> MAINTAINERS | 1 +
> drivers/watchdog/Kconfig | 9 ++
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/max77714_wdt.c | 171 ++++++++++++++++++++++++++++++++
> 4 files changed, 182 insertions(+)
> create mode 100644 drivers/watchdog/max77714_wdt.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index df394192f14e..08900b5729a5 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -11390,6 +11390,7 @@ M: Luca Ceresoli <luca@...aceresoli.net>
> S: Maintained
> F: Documentation/devicetree/bindings/mfd/maxim,max77714.yaml
> F: drivers/mfd/max77714.c
> +F: drivers/watchdog/max77714_wdt.c
> F: include/linux/mfd/max77714.h
>
> MAXIM MAX77802 PMIC REGULATOR DEVICE DRIVER
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index bf59faeb3de1..00bc3f932a6c 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -699,6 +699,15 @@ config MAX77620_WATCHDOG
> MAX77620 chips. To compile this driver as a module,
> choose M here: the module will be called max77620_wdt.
>
> +config MAX77714_WATCHDOG
> + tristate "Maxim MAX77714 Watchdog Timer"
> + depends on MFD_MAX77714 || COMPILE_TEST
> + help
> + This is the driver for watchdog timer in the MAX77714 PMIC.
> + Say 'Y' here to enable the watchdog timer support for
> + MAX77714 chips. To compile this driver as a module,
> + choose M here: the module will be called max77714_wdt.
> +
> config IMX2_WDT
> tristate "IMX2+ Watchdog"
> depends on ARCH_MXC || ARCH_LAYERSCAPE || COMPILE_TEST
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 1bd2d6f37c53..268a942311a0 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -215,6 +215,7 @@ obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
> obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
> obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o
> obj-$(CONFIG_MAX77620_WATCHDOG) += max77620_wdt.o
> +obj-$(CONFIG_MAX77714_WATCHDOG) += max77714_wdt.o
> obj-$(CONFIG_ZIIRAVE_WATCHDOG) += ziirave_wdt.o
> obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
> obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o
> diff --git a/drivers/watchdog/max77714_wdt.c b/drivers/watchdog/max77714_wdt.c
> new file mode 100644
> index 000000000000..2d468db849f9
> --- /dev/null
> +++ b/drivers/watchdog/max77714_wdt.c
> @@ -0,0 +1,171 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Maxim MAX77714 Watchdog Driver
> + *
> + * Copyright (C) 2021 Luca Ceresoli
> + * Author: Luca Ceresoli <luca@...aceresoli.net>
> + */
> +
> +#include <linux/err.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/max77714.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/watchdog.h>
> +
> +struct max77714_wdt {
> + struct device *dev;
> + struct regmap *rmap;
> + struct watchdog_device wd_dev;
> +};
> +
> +/* Timeout in seconds, indexed by TWD bits of CNFG_GLBL2 register */
> +unsigned int max77714_margin_value[] = { 2, 16, 64, 128 };
static
> +
> +static int max77714_wdt_start(struct watchdog_device *wd_dev)
> +{
> + struct max77714_wdt *wdt = watchdog_get_drvdata(wd_dev);
> +
> + return regmap_update_bits(wdt->rmap, MAX77714_CNFG_GLBL2,
> + MAX77714_WDTEN, MAX77714_WDTEN);
> +}
> +
> +static int max77714_wdt_stop(struct watchdog_device *wd_dev)
> +{
> + struct max77714_wdt *wdt = watchdog_get_drvdata(wd_dev);
> +
> + return regmap_update_bits(wdt->rmap, MAX77714_CNFG_GLBL2,
> + MAX77714_WDTEN, 0);
> +}
> +
> +static int max77714_wdt_ping(struct watchdog_device *wd_dev)
> +{
> + struct max77714_wdt *wdt = watchdog_get_drvdata(wd_dev);
> +
> + return regmap_update_bits(wdt->rmap, MAX77714_CNFG_GLBL3,
> + MAX77714_WDTC, 1);
> +}
> +
> +static int max77714_wdt_set_timeout(struct watchdog_device *wd_dev,
> + unsigned int timeout)
> +{
> + struct max77714_wdt *wdt = watchdog_get_drvdata(wd_dev);
> + unsigned int new_timeout, new_twd;
> + int err;
> +
> + for (new_twd = 0; new_twd < ARRAY_SIZE(max77714_margin_value) - 1; new_twd++)
> + if (timeout <= max77714_margin_value[new_twd])
> + break;
> +
> + /* new_wdt is not out of bounds here due to the "- 1" in the for loop */
> + new_timeout = max77714_margin_value[new_twd];
> +
> + /*
> + * "If the value of TWD needs to be changed, clear the system
> + * watchdog timer first [...], then change the value of TWD."
> + * (MAX77714 datasheet)
> + */
> + err = regmap_update_bits(wdt->rmap, MAX77714_CNFG_GLBL3,
> + MAX77714_WDTC, 1);
> + if (err)
> + return err;
> +
> + err = regmap_update_bits(wdt->rmap, MAX77714_CNFG_GLBL2,
> + MAX77714_TWD_MASK, new_twd);
> + if (err)
> + return err;
> +
> + wd_dev->timeout = new_timeout;
> +
> + dev_dbg(wdt->dev, "New timeout = %u s (WDT = 0x%x)", new_timeout, new_twd);
> +
> + return 0;
> +}
> +
> +static const struct watchdog_info max77714_wdt_info = {
> + .identity = "max77714-watchdog",
> + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
> +};
> +
> +static const struct watchdog_ops max77714_wdt_ops = {
> + .start = max77714_wdt_start,
> + .stop = max77714_wdt_stop,
> + .ping = max77714_wdt_ping,
> + .set_timeout = max77714_wdt_set_timeout,
> +};
> +
> +static int max77714_wdt_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct max77714_wdt *wdt;
> + struct watchdog_device *wd_dev;
> + unsigned int regval;
> + int err;
> +
> + wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
> + if (!wdt)
> + return -ENOMEM;
> +
> + wdt->dev = dev;
> +
> + wd_dev = &wdt->wd_dev;
> + wd_dev->info = &max77714_wdt_info;
> + wd_dev->ops = &max77714_wdt_ops;
> + wd_dev->min_timeout = 2;
> + wd_dev->max_timeout = 128;
> +
> + platform_set_drvdata(pdev, wdt);
> + watchdog_set_drvdata(wd_dev, wdt);
> +
> + wdt->rmap = dev_get_regmap(dev->parent, NULL);
> + if (!wdt->rmap)
> + return dev_err_probe(wdt->dev, -ENODEV, "Failed to get parent regmap\n");
> +
> + /* WD_RST_WK: if 1 wdog restarts; if 0 wdog shuts down */
> + err = regmap_update_bits(wdt->rmap, MAX77714_CNFG2_ONOFF,
> + MAX77714_WD_RST_WK, MAX77714_WD_RST_WK);
> + if (err)
> + return dev_err_probe(wdt->dev, err, "Error updating CNFG2_ONOFF\n");
> +
> + err = regmap_read(wdt->rmap, MAX77714_CNFG_GLBL2, ®val);
> + if (err)
> + return dev_err_probe(wdt->dev, err, "Error reading CNFG_GLBL2\n");
> +
> + /* enable watchdog | enable auto-clear in sleep state */
> + regval |= (MAX77714_WDTEN | MAX77714_WDTSLPC);
> +
> + err = regmap_write(wdt->rmap, MAX77714_CNFG_GLBL2, regval);
> + if (err)
> + return dev_err_probe(wdt->dev, err, "Error writing CNFG_GLBL2\n");
> +
> + wd_dev->timeout = max77714_margin_value[regval & MAX77714_TWD_MASK];
> +
> + dev_dbg(wdt->dev, "Timeout = %u s (WDT = 0x%x)",
> + wd_dev->timeout, regval & MAX77714_TWD_MASK);
> +
> + set_bit(WDOG_HW_RUNNING, &wd_dev->status);
> +
> + watchdog_stop_on_unregister(wd_dev);
> +
> + err = devm_watchdog_register_device(dev, wd_dev);
> + if (err)
> + return dev_err_probe(dev, err, "Cannot register watchdog device\n");
> +
> + dev_info(dev, "registered as /dev/watchdog%d\n", wd_dev->id);
> +
> + return 0;
> +}
> +
> +static struct platform_driver max77714_wdt_driver = {
> + .driver = {
> + .name = "max77714-watchdog",
> + },
> + .probe = max77714_wdt_probe,
> +};
> +
> +module_platform_driver(max77714_wdt_driver);
> +
> +MODULE_DESCRIPTION("MAX77714 watchdog timer driver");
> +MODULE_AUTHOR("Luca Ceresoli <luca@...aceresoli.net>");
> +MODULE_LICENSE("GPL v2");
>
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