[PATCH v5 6/8] watchdog: at91sam9_wdt: add timeout-sec property binding

[Fabio Porcedda]

Tested on at91sam9260 board (evk-pro3).

Signed-off-by: Fabio Porcedda <fabio.porcedda at gmail.com>
Cc: Andrew Victor <linux at maxim.org.za>
Cc: Nicolas Ferre <nicolas.ferre at atmel.com>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
 Documentation/devicetree/bindings/watchdog/atmel-wdt.txt |  4 ++++
 drivers/watchdog/Kconfig                                 |  1 +
 drivers/watchdog/at91sam9_wdt.c                          | 16 +++++++++++++---
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt b/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
index 2957ebb..fcdd48f 100644
--- a/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
@@ -7,9 +7,13 @@ Required properties:
 - reg: physical base address of the controller and length of memory mapped
   region.
 
+Optional properties:
+- timeout-sec: contains the watchdog timeout in seconds.
+
 Example:
 
 	watchdog at fffffd40 {
 		compatible = "atmel,at91sam9260-wdt";
 		reg = <0xfffffd40 0x10>;
+		timeout-sec = <10>;
 	};
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index ad1bb93..dda695f 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -114,6 +114,7 @@ config AT91RM9200_WATCHDOG
 config AT91SAM9X_WATCHDOG
 	tristate "AT91SAM9X / AT91CAP9 watchdog"
 	depends on ARCH_AT91 && !ARCH_AT91RM9200
+	select WATCHDOG_CORE
 	help
 	  Watchdog timer embedded into AT91SAM9X and AT91CAP9 chips. This will
 	  reboot your system when the timeout is reached.
diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c
index dc42e44..d864dc4 100644
--- a/drivers/watchdog/at91sam9_wdt.c
+++ b/drivers/watchdog/at91sam9_wdt.c
@@ -57,8 +57,10 @@
 #define WDT_TIMEOUT	(HZ/2)
 
 /* User land timeout */
+#define MIN_HEARTBEAT 1
+#define MAX_HEARTBEAT 16
 #define WDT_HEARTBEAT 15
-static int heartbeat = WDT_HEARTBEAT;
+static int heartbeat;
 module_param(heartbeat, int, 0);
 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeats in seconds. "
 	"(default = " __MODULE_STRING(WDT_HEARTBEAT) ")");
@@ -255,6 +257,12 @@ static struct miscdevice at91wdt_miscdev = {
 	.fops		= &at91wdt_fops,
 };
 
+static struct watchdog_device at91wdt_wdd __initdata = {
+	.timeout = WDT_HEARTBEAT,
+	.min_timeout = MIN_HEARTBEAT,
+	.max_timeout = MAX_HEARTBEAT,
+};
+
 static int __init at91wdt_probe(struct platform_device *pdev)
 {
 	struct resource	*r;
@@ -273,6 +281,8 @@ static int __init at91wdt_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
+	watchdog_init_timeout(&at91wdt_wdd, heartbeat, pdev->dev.of_node);
+
 	/* Set watchdog */
 	res = at91_wdt_settimeout(ms_to_ticks(WDT_HW_TIMEOUT * 1000));
 	if (res)
@@ -282,12 +292,12 @@ static int __init at91wdt_probe(struct platform_device *pdev)
 	if (res)
 		return res;
 
-	at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
+	at91wdt_private.next_heartbeat = jiffies + at91wdt_wdd.timeout * HZ;
 	setup_timer(&at91wdt_private.timer, at91_ping, 0);
 	mod_timer(&at91wdt_private.timer, jiffies + WDT_TIMEOUT);
 
 	pr_info("enabled (heartbeat=%d sec, nowayout=%d)\n",
-		heartbeat, nowayout);
+		at91wdt_wdd.timeout, nowayout);
 
 	return 0;
 }
-- 
1.8.0