linux-kernel - Re: [PATCH v6 2/2] Documentation: dt: binding: atmel-sama5d4-wdt: for SAMA5D4 watchdog driver

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Date:	Fri, 07 Aug 2015 08:27:05 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Wenyou Yang <wenyou.yang@...el.com>, wim@...ana.be,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org
CC:	sylvain.rochet@...secur.com, nicolas.ferre@...el.com,
	boris.brezillon@...e-electrons.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v6 2/2] Documentation: dt: binding: atmel-sama5d4-wdt:
 for SAMA5D4 watchdog driver

On 08/06/2015 03:17 AM, Wenyou Yang wrote:
> 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@...el.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   .../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@...68640 {
> +		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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