From f4fff94e3e3a712ef062c44b64ecf8f552f48ea4 Mon Sep 17 00:00:00 2001
From: Wenyou Yang <wenyou.yang@atmel.com>
Date: Thu, 6 Aug 2015 18:17:05 +0800
Subject: [PATCH] Documentation: dt: binding: atmel-sama5d4-wdt: for SAMA5D4
watchdog driver
The compatible "atmel,sama5d4-wdt" supports the SAMA5D4 watchdog driver
and the watchdog's WDT_MR register can be written more than once.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
---
.../bindings/watchdog/atmel-sama5d4-wdt.txt | 35 +++++++++++++++++++
1 file changed, 35 insertions(+)
create mode 100644 Documentation/devicetree/bindings/watchdog/atmel-sama5d4-wdt.txt
diff --git a/Documentation/devicetree/bindings/watchdog/atmel-sama5d4-wdt.txt b/Documentation/devicetree/bindings/watchdog/atmel-sama5d4-wdt.txt
new file mode 100644
index 00000000000000..f7cc7c0609107d
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/atmel-sama5d4-wdt.txt
@@ -0,0 +1,35 @@
+* Atmel SAMA5D4 Watchdog Timer (WDT) Controller
+
+Required properties:
+- compatible: "atmel,sama5d4-wdt"
+- reg: base physical address and length of memory mapped region.
+
+Optional properties:
+- timeout-sec: watchdog timeout value (in seconds).
+- interrupts: interrupt number to the CPU.
+- atmel,watchdog-type: should be "hardware" or "software".
+ "hardware": enable watchdog fault reset. A watchdog fault triggers
+ watchdog reset.
+ "software": enable watchdog fault interrupt. A watchdog fault asserts
+ watchdog interrupt.
+- atmel,idle-halt: present if you want to stop the watchdog when the CPU is
+ in idle state.
+ CAUTION: This property should be used with care, it actually makes the
+ watchdog not counting when the CPU is in idle state, therefore the
+ watchdog reset time depends on mean CPU usage and will not reset at all
+ if the CPU stop working while it is in idle state, which is probably
+ not what you want.
+- atmel,dbg-halt: present if you want to stop the watchdog when the CPU is
+ in debug state.
+
+Example:
+ watchdog@fc068640 {
+ compatible = "atmel,sama5d4-wdt";
+ reg = <0xfc068640 0x10>;
+ interrupts = <4 IRQ_TYPE_LEVEL_HIGH 5>;
+ timeout-sec = <10>;
+ atmel,watchdog-type = "hardware";
+ atmel,dbg-halt;
+ atmel,idle-halt;
+ status = "okay";
+ };
--
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