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From bd1b9f66d5134e518419f4c4dacf1884c1616983 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
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 <pali@kernel.org>
---
drivers/watchdog/max63xx_wdt.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
--- a/drivers/watchdog/max63xx_wdt.c
+++ b/drivers/watchdog/max63xx_wdt.c
@@ -26,6 +26,7 @@
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/slab.h>
+#include <linux/gpio/consumer.h>
#define DEFAULT_HEARTBEAT 60
#define MAX_HEARTBEAT 60
@@ -52,6 +53,9 @@ 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);
@@ -157,6 +161,17 @@ 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;
@@ -221,10 +236,19 @@ 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);
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