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76 lines
2.1 KiB
Diff
76 lines
2.1 KiB
Diff
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From bd1b9f66d5134e518419f4c4dacf1884c1616983 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
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Date: Thu, 28 Apr 2022 11:13:23 +0200
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Subject: [PATCH] watchdog: max63xx_wdt: Add support for specifying WDI logic
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via GPIO
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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On some boards is WDI logic of max6370 chip connected via GPIO.
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So extend max63xx_wdt driver to allow specifying WDI logic via GPIO.
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Signed-off-by: Pali Rohár <pali@kernel.org>
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---
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drivers/watchdog/max63xx_wdt.c | 24 ++++++++++++++++++++++++
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1 file changed, 24 insertions(+)
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--- a/drivers/watchdog/max63xx_wdt.c
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+++ b/drivers/watchdog/max63xx_wdt.c
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@@ -27,6 +27,7 @@
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/property.h>
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+#include <linux/gpio/consumer.h>
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#define DEFAULT_HEARTBEAT 60
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#define MAX_HEARTBEAT 60
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@@ -53,6 +54,9 @@ struct max63xx_wdt {
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void __iomem *base;
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spinlock_t lock;
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+ /* GPIOs */
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+ struct gpio_desc *gpio_wdi;
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+
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/* WDI and WSET bits write access routines */
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void (*ping)(struct max63xx_wdt *wdt);
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void (*set)(struct max63xx_wdt *wdt, u8 set);
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@@ -158,6 +162,17 @@ static const struct watchdog_info max63x
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.identity = "max63xx Watchdog",
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};
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+static void max63xx_gpio_ping(struct max63xx_wdt *wdt)
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+{
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+ spin_lock(&wdt->lock);
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+
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+ gpiod_set_value(wdt->gpio_wdi, 1);
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+ udelay(1);
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+ gpiod_set_value(wdt->gpio_wdi, 0);
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+
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+ spin_unlock(&wdt->lock);
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+}
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+
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static void max63xx_mmap_ping(struct max63xx_wdt *wdt)
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{
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u8 val;
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@@ -225,10 +240,19 @@ static int max63xx_wdt_probe(struct plat
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return -EINVAL;
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}
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+ wdt->gpio_wdi = devm_gpiod_get(dev, NULL, GPIOD_FLAGS_BIT_DIR_OUT);
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+ if (IS_ERR(wdt->gpio_wdi) && PTR_ERR(wdt->gpio_wdi) != -ENOENT)
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+ return dev_err_probe(dev, PTR_ERR(wdt->gpio_wdi),
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+ "unable to request gpio: %ld\n",
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+ PTR_ERR(wdt->gpio_wdi));
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+
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err = max63xx_mmap_init(pdev, wdt);
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if (err)
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return err;
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+ if (!IS_ERR(wdt->gpio_wdi))
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+ wdt->ping = max63xx_gpio_ping;
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+
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platform_set_drvdata(pdev, &wdt->wdd);
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watchdog_set_drvdata(&wdt->wdd, wdt);
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