linux-kernel - Re: [PATCH v5 1/2] ARM: dts: at91: shdwc binding: add new shutdown controller documentation

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Date:	Thu, 17 Mar 2016 21:14:03 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	linux-arm-kernel@...ts.infradead.org, sre@...nel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk
Subject: Re: [PATCH v5 1/2] ARM: dts: at91: shdwc binding: add new shutdown
 controller documentation

On 16/03/2016 at 14:19:49 +0100, Nicolas Ferre wrote :
> The new shutdown controller compatible with sama5d2 has a new binding
> documentation and properties.
> 
> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
> Cc: devicetree@...r.kernel.org
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Pawel Moll <pawel.moll@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
> 
> doc
> 

with that spurious "doc" removed,

Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>



> ---
> 
> Changes in v5:
> - change naming for this driver: instead of the "alternate shdwc" we choose a
>   more specific "sama5d2-compatible shdwc" wording.
> 
> Changes in v4:
> - change property to debounce-delay-us so that we can use a generic property
>   and we can have the unit explicitly included it the name according to
>   Documentation/devicetree/bindings/property-units.txt.
> - move to atmel,wakeup-active-high boolean property instead of a "high", "low"
>   string comparison.
> 
> Changes in v3:
> - get and use slow clock and specify its handler in binding
> 
> Changes in v2: None
> 
>  .../devicetree/bindings/arm/atmel-at91.txt         | 59 ++++++++++++++++++++++
>  1 file changed, 59 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/atmel-at91.txt b/Documentation/devicetree/bindings/arm/atmel-at91.txt
> index 7fd64ec9ee1d..2f5a07b32fb7 100644
> --- a/Documentation/devicetree/bindings/arm/atmel-at91.txt
> +++ b/Documentation/devicetree/bindings/arm/atmel-at91.txt
> @@ -147,6 +147,65 @@ Example:
>  		clocks = <&clk32k>;
>  	};
>  
> +SHDWC SAMA5D2-Compatible Shutdown Controller
> +
> +1) shdwc node
> +
> +required properties:
> +- compatible: should be "atmel,sama5d2-shdwc".
> +- reg: should contain registers location and length
> +- clocks: phandle to input clock.
> +- #address-cells: should be one. The cell is the wake-up input index.
> +- #size-cells: should be zero.
> +
> +optional properties:
> +
> +- debounce-delay-us: minimum wake-up inputs debouncer period in
> +  microseconds. It's usually a board-related property.
> +- atmel,wakeup-rtc-timer: boolean to enable Real-Time Clock wake-up.
> +
> +The node contains child nodes for each wake-up input that the platform uses.
> +
> +2) input nodes
> +
> +Wake-up input nodes are usually described in the "board" part of the Device
> +Tree. Note also that input 0 is linked to the wake-up pin and is frequently
> +used.
> +
> +Required properties:
> +- reg: should contain the wake-up input index [0 - 15].
> +
> +Optional properties:
> +- atmel,wakeup-active-high: boolean, the corresponding wake-up input described
> +  by the child, forces the wake-up of the core power supply on a high level.
> +  The default is to be active low.
> +
> +Example:
> +
> +On the SoC side:
> +	shdwc@...48010 {
> +		compatible = "atmel,sama5d2-shdwc";
> +		reg = <0xf8048010 0x10>;
> +		clocks = <&clk32k>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		atmel,wakeup-rtc-timer;
> +	};
> +
> +On the board side:
> +	shdwc@...48010 {
> +		debounce-delay-us = <976>;
> +
> +		input@0 {
> +			reg = <0>;
> +		};
> +
> +		input@1 {
> +			reg = <1>;
> +			atmel,wakeup-active-high;
> +		};
> +	};
> +
>  Special Function Registers (SFR)
>  
>  Special Function Registers (SFR) manage specific aspects of the integrated
> -- 
> 2.1.3
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com