linux-kernel - Re: [PATCH v3 8/8] rtc: at91sam9: add DT bindings documentation

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Date:	Thu, 11 Sep 2014 11:42:13 +0200
From:	Johan Hovold <johan@...nel.org>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Andrew Victor <linux@...im.org.za>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, Johan Hovold <jhovold@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Douglas Gilbert <dgilbert@...erlog.com>
Subject: Re: [PATCH v3 8/8] rtc: at91sam9: add DT bindings documentation

On Thu, Sep 11, 2014 at 10:56:07AM +0200, Boris BREZILLON wrote:
> Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> ---
>  .../devicetree/bindings/rtc/atmel,at91sam9-rtc.txt | 24 ++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
> 
> diff --git a/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt b/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
> new file mode 100644
> index 0000000..258a036
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
> @@ -0,0 +1,24 @@
> +Atmel AT91SAM9260 Real Time Timer
> +
> +Required properties:
> +- compatible: should be: "atmel,at91sam9260-rtt"
> +- reg: should encode the memory region of the RTT controller
> +- interrupts: rtc alarm/event interrupt
> +- clocks: should contain one clock pointing the the slow clk
> +- atmel,time-reg: should encode the GPBR register used to store the RTC
> +		  time. The first cell should point to the GPBR node and
> +		  the second one encode the offset within the GPBR block
> +		  (or in other terms, the GPBR register used to store the
> +		  current time value).
> +
> +
> +
> +Example:
> +
> +rtc@...ffe00 {

This should be rtt@

> +	compatible = "atmel,at91sam9260-rtt";
> +	reg = <0xfffffd20 0x10>;
> +	interrupts = <1 4 7>;
> +	clocks = <&clk32k>;
> +	atmel,time-reg = <&gpbr 0x0>;

I think the property name could be more descriptive as it is specific to
when the RTT is used as an RTC. Perhaps, atmel,rtt-rtc-time-reg?

> +};

Johan
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