[PATCH 09/23 v2] watchdog: coh901327: devicetree support

[Linus Walleij <linus.walleij@stericsson.com>]

From: Linus Walleij <linus.walleij@linaro.org>

This adds support for probing the COH 901 327 watchdog from
the device tree and also adds associated bindings.

Cc: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v1->v2: augment driver to call watchdog_init_timeout()
 so we can also set the timeout from the device tree, as per
 suggestion from Guenter Roeck.

Hi Wim, I'm seeking an ACK on this patch to take it into
ARM SoC along with the patches making use of this new
binding.
---
 .../bindings/watchdog/stericsson-coh901327.txt        | 19 +++++++++++++++++++
 drivers/watchdog/coh901327_wdt.c                      | 12 +++++++++---
 2 files changed, 28 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/watchdog/stericsson-coh901327.txt

diff --git a/Documentation/devicetree/bindings/watchdog/stericsson-coh901327.txt b/Documentation/devicetree/bindings/watchdog/stericsson-coh901327.txt
new file mode 100644
index 0000000..8ffb88e
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/stericsson-coh901327.txt
@@ -0,0 +1,19 @@
+ST-Ericsson COH 901 327 Watchdog timer
+
+Required properties:
+- compatible: must be "stericsson,coh901327".
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- interrupts: the interrupt used for the watchdog timeout warning.
+
+Optional properties:
+- timeout-sec: contains the watchdog timeout in seconds.
+
+Example:
+
+watchdog: watchdog@c0012000 {
+	compatible = "stericsson,coh901327";
+	reg = <0xc0012000 0x1000>;
+	interrupts = <3>;
+	timeout-sec = <60>;
+};
diff --git a/drivers/watchdog/coh901327_wdt.c b/drivers/watchdog/coh901327_wdt.c
index b9b8a8b..4bd070f 100644
--- a/drivers/watchdog/coh901327_wdt.c
+++ b/drivers/watchdog/coh901327_wdt.c
@@ -354,9 +354,9 @@ static int __init coh901327_probe(struct platform_device *pdev)
 
 	clk_disable(clk);
 
-	if (margin < 1 || margin > 327)
-		margin = 60;
-	coh901327_wdt.timeout = margin;
+	ret = watchdog_init_timeout(&coh901327_wdt, margin, &pdev->dev);
+	if (ret < 0)
+		coh901327_wdt.timeout = 60;
 
 	ret = watchdog_register_device(&coh901327_wdt);
 	if (ret == 0)
@@ -441,10 +441,16 @@ void coh901327_watchdog_reset(void)
 	/* Return and await doom */
 }
 
+static const struct of_device_id coh901327_dt_match[] = {
+	{ .compatible = "stericsson,coh901327" },
+	{},
+};
+
 static struct platform_driver coh901327_driver = {
 	.driver = {
 		.owner	= THIS_MODULE,
 		.name	= "coh901327_wdog",
+		.of_match_table = coh901327_dt_match,
 	},
 	.remove		= __exit_p(coh901327_remove),
 	.suspend	= coh901327_suspend,
-- 
1.7.11.3