From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wenyou Yang Subject: [PATCH v5 2/2] Documentation: dt: binding: atmel-sama5d4-wdt: for SAMA5D4 watchdog driver Date: Thu, 6 Aug 2015 16:34:15 +0800 Message-ID: <1438850055-30104-3-git-send-email-wenyou.yang@atmel.com> References: <1438850055-30104-1-git-send-email-wenyou.yang@atmel.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1438850055-30104-1-git-send-email-wenyou.yang@atmel.com> Sender: linux-kernel-owner@vger.kernel.org To: wim@iguana.be, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org Cc: sylvain.rochet@finsecur.com, nicolas.ferre@atmel.com, boris.brezillon@free-electrons.com, wenyou.yang@atmel.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org 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 --- .../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 0000000..f7cc7c0 --- /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"; + }; -- 1.7.9.5