linux-kernel - [PATCH 3/3] watchdog: dw_wdt: add a devicetree binding

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Message-Id: <201306262005.05765.heiko@sntech.de>
Date:	Wed, 26 Jun 2013 20:05:05 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Wim Van Sebroeck <wim@...ana.be>
Cc:	Jamie Iles <jamie@...ieiles.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-watchdog@...r.kernel.org
Subject: [PATCH 3/3] watchdog: dw_wdt: add a devicetree binding

The dw_wdt does not use any platform-specific data, so no new properties
need to be introduced. The dw-apb-wdt naming follows other designware
components in the kernel and is also written like this in documentation
describing the component.

Signed-off-by: Heiko Stuebner <heiko@...ech.de>
---
 .../devicetree/bindings/watchdog/snps-dw-apb-wdt.txt |   18 ++++++++++++++++++
 drivers/watchdog/dw_wdt.c                            |   10 ++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/snps-dw-apb-wdt.txt

diff --git a/Documentation/devicetree/bindings/watchdog/snps-dw-apb-wdt.txt b/Documentation/devicetree/bindings/watchdog/snps-dw-apb-wdt.txt
new file mode 100644
index 0000000..c20cdd1
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/snps-dw-apb-wdt.txt
@@ -0,0 +1,18 @@
+* Synosis DesignWare APB Watchdog
+
+The Watchdog controller is used for resuming system operation
+after a preset amount of time during which the WDT reset event has not
+occurred.
+
+Required properties:
+- compatible : "snps,dw-apb-wdt"
+- reg : offset and length of the register set for the device.
+- clocks : the periphal clock of the controller.
+
+Example:
+
+	watchdog@...4c000 {
+		compatible = "snps,dw-apb-wdt";
+		reg = <0x2004c000 0x100>;
+		clocks = <&wdt_clock>;
+	};
diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index b922bec..829e148 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -35,6 +35,7 @@
 #include <linux/timer.h>
 #include <linux/uaccess.h>
 #include <linux/watchdog.h>
+#include <linux/of.h>
 
 #define WDOG_CONTROL_REG_OFFSET		    0x00
 #define WDOG_CONTROL_REG_WDT_EN_MASK	    0x01
@@ -337,12 +338,21 @@ static int dw_wdt_drv_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id dw_wdt_of_match[] = {
+	{ .compatible = "snps,dw-apb-wdt", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
+#endif
+
 static struct platform_driver dw_wdt_driver = {
 	.probe		= dw_wdt_drv_probe,
 	.remove		= dw_wdt_drv_remove,
 	.driver		= {
 		.name	= "dw_wdt",
 		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(dw_wdt_of_match),
 		.pm	= &dw_wdt_pm_ops,
 	},
 };
-- 
1.7.10.4

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