linux-kernel - Re: [PATCH v3 2/2] devicetree: Add Cadence WDT devicetree bindings documentation

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Date:	Mon, 14 Jul 2014 16:07:49 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Harini Katakam <harinik@...inx.com>
Cc:	"wim@...ana.be" <wim@...ana.be>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"rob@...dley.net" <rob@...dley.net>,
	"michals@...inx.com" <michals@...inx.com>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"harinikatakamlinux@...il.com" <harinikatakamlinux@...il.com>,
	"harini.katakam@...inx.com" <harini.katakam@...inx.com>
Subject: Re: [PATCH v3 2/2] devicetree: Add Cadence WDT devicetree bindings
 documentation

On Mon, Jul 14, 2014 at 01:16:09PM +0100, Harini Katakam wrote:
> Add cadence-wdt bindings documentation.
> 
> Signed-off-by: Harini Katakam <harinik@...inx.com>
> ---
> 
> v3 changes:
> - Change reset property type and improve description.
> - Improve description of clocks and interrupts.
> - Use watchdog@ in the example.
> - Use only cdns compatible string for now.
> 
> v2:
> No changes
> 
> ---
>  .../devicetree/bindings/watchdog/cadence-wdt.txt   |   27 ++++++++++++++++++++
>  1 file changed, 27 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/cadence-wdt.txt
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/cadence-wdt.txt b/Documentation/devicetree/bindings/watchdog/cadence-wdt.txt
> new file mode 100644
> index 0000000..ab23e38
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/cadence-wdt.txt
> @@ -0,0 +1,27 @@
> +Zynq Watchdog Device Tree Bindings
> +-------------------------------------------
> +
> +Required properties:
> +- compatible		: Should be "cdns,wdt-r1p2".
> +- clocks		: Input clock specifier. This should be the ref clk.

This wording makes it sound like the watchdog block has more than one
clock input. Does it?

> +- reg			: Physical base address and size of WDT registers map.
> +- interrupts		: Property with a value describing the interrupt
> +			  number. This interrupt is used for indication
> +			  when the watchdog times out.

Just say "the watchdog timeout interrupt", or (better) use the name of
the interrupt from the documentation.

> +- interrupt-parent	: Must be core interrupt controller.
> +
> +Optional properties
> +- reset			: If this property exists, then a reset is done
> +			  when watchdog times out.

That's a bit of an ambiguous name (too easy to misconstrue as a reset
device reference). Do any other watchdogs have similar properties?

Thanks,
Mark.

> +- timeout-sec		: Watchdog timeout value (in seconds).
> +
> +Example:
> +	watchdog@...05000 {
> +		compatible = "xlnx,zynq-wdt-r1p2";
> +		clocks = <&clkc 45>;
> +		interrupt-parent = <&intc>;
> +		interrupts = <0 9 1>;
> +		reg = <0xf8005000 0x1000>;
> +		reset;
> +		timeout-sec = <10>;
> +	};
> -- 
> 1.7.9.5
> 
> 
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