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 <pali@xxxxxxxxxx> --- Changes in v2: * Usage of dev_err_probe() * Fixing assignment of wdt->ping * Remove clearing of wdt->gpio_wdi * Move YAML change to separate patch --- drivers/watchdog/max63xx_wdt.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/watchdog/max63xx_wdt.c b/drivers/watchdog/max63xx_wdt.c index 9e1541cfae0d..6e43f9e6d7eb 100644 --- a/drivers/watchdog/max63xx_wdt.c +++ b/drivers/watchdog/max63xx_wdt.c @@ -27,6 +27,7 @@ #include <linux/io.h> #include <linux/slab.h> #include <linux/property.h> +#include <linux/gpio/consumer.h> #define DEFAULT_HEARTBEAT 60 #define MAX_HEARTBEAT 60 @@ -53,6 +54,9 @@ 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); @@ -158,6 +162,17 @@ static const struct watchdog_info max63xx_wdt_info = { .identity = "max63xx Watchdog", }; +static void max63xx_gpio_ping(struct max63xx_wdt *wdt) +{ + spin_lock(&wdt->lock); + + gpiod_set_value_cansleep(wdt->gpio_wdi, 1); + udelay(1); + gpiod_set_value_cansleep(wdt->gpio_wdi, 0); + + spin_unlock(&wdt->lock); +} + static void max63xx_mmap_ping(struct max63xx_wdt *wdt) { u8 val; @@ -225,10 +240,19 @@ static int max63xx_wdt_probe(struct platform_device *pdev) 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); -- 2.20.1