From bd1b9f66d5134e518419f4c4dacf1884c1616983 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= Date: Thu, 28 Apr 2022 11:13:23 +0200 Subject: [PATCH] watchdog: max63xx_wdt: Add support for specifying WDI logic via GPIO MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On some boards is WDI logic of max6370 chip connected via GPIO. So extend max63xx_wdt driver to allow specifying WDI logic via GPIO. Signed-off-by: Pali Rohár --- drivers/watchdog/max63xx_wdt.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) --- a/drivers/watchdog/max63xx_wdt.c +++ b/drivers/watchdog/max63xx_wdt.c @@ -24,6 +24,7 @@ #include #include #include +#include #define DEFAULT_HEARTBEAT 60 #define MAX_HEARTBEAT 60 @@ -50,6 +51,9 @@ struct max63xx_wdt { void __iomem *base; spinlock_t lock; + /* GPIOs */ + struct gpio_desc *gpio_wdi; + /* WDI and WSET bits write access routines */ void (*ping)(struct max63xx_wdt *wdt); void (*set)(struct max63xx_wdt *wdt, u8 set); @@ -155,6 +159,17 @@ static const struct watchdog_info max63x .identity = "max63xx Watchdog", }; +static void max63xx_gpio_ping(struct max63xx_wdt *wdt) +{ + spin_lock(&wdt->lock); + + gpiod_set_value(wdt->gpio_wdi, 1); + udelay(1); + gpiod_set_value(wdt->gpio_wdi, 0); + + spin_unlock(&wdt->lock); +} + static void max63xx_mmap_ping(struct max63xx_wdt *wdt) { u8 val; @@ -222,10 +237,19 @@ static int max63xx_wdt_probe(struct plat return -EINVAL; } + wdt->gpio_wdi = devm_gpiod_get(dev, NULL, GPIOD_FLAGS_BIT_DIR_OUT); + if (IS_ERR(wdt->gpio_wdi) && PTR_ERR(wdt->gpio_wdi) != -ENOENT) + return dev_err_probe(dev, PTR_ERR(wdt->gpio_wdi), + "unable to request gpio: %ld\n", + PTR_ERR(wdt->gpio_wdi)); + err = max63xx_mmap_init(pdev, wdt); if (err) return err; + if (!IS_ERR(wdt->gpio_wdi)) + wdt->ping = max63xx_gpio_ping; + platform_set_drvdata(pdev, &wdt->wdd); watchdog_set_drvdata(&wdt->wdd, wdt);