linux-kernel - Re: [PATCH v2 2/5] irqchip: Add DT binding doc for dumb demuxer chips

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Date:	Tue, 13 Jan 2015 14:00:50 -0500
From:	Jason Cooper <jason@...edaemon.net>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	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
Subject: Re: [PATCH v2 2/5] irqchip: Add DT binding doc for dumb demuxer
 chips

Boris,

On Tue, Jan 13, 2015 at 07:46:18PM +0100, Boris Brezillon wrote:
> Add documentation for the dumb demuxer.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
>  .../bindings/interrupt-controller/dumb-demux.txt   | 34 ++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/dumb-demux.txt
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/dumb-demux.txt b/Documentation/devicetree/bindings/interrupt-controller/dumb-demux.txt
> new file mode 100644
> index 0000000..1c777ef
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/dumb-demux.txt
> @@ -0,0 +1,34 @@
> +* Generic Dumb Interrupt Demultiplexer
> +
> +This Dumb demultiplixer simply forward all incoming interrupts to its
> +enabled/unmasked children.

Please forgive the potentially naïve question, but what hardware is this
describing?

thx,

Jason.

> +
> +Required properties:
> +- compatible: Should be "irqchip-dumb-demux".
> +- interrupt-controller: Identifies the node as an interrupt controller.
> +- interrupts-extended or interrupt-parent and interrupts: Reference the source
> +  interrupt connected to this dumb demuxer.
> +- #interrupt-cells: The number of cells to define the interrupts (should be 1).
> +  The only cell is the IRQ number.
> +- irqs: u32 bitfield specifying the interrupts provided by the demuxer.
> +
> +Examples:
> +	/*
> +	 * Dumb demuxer controller
> +	 */
> +	dumb_irq1_demux: dumb-irq-demux@1 {
> +		compatible = "irqchip-dumb-demux";
> +		interrupt-controller;
> +		#interrupt-cells = <1>;
> +		interrupts-extended = <&aic 1 IRQ_TYPE_LEVEL_HIGH 7>;
> +		irqs = <0x3f>;
> +	};
> +
> +	/*
> +	 * Device connected on this dumb demuxer
> +	 */
> +	dma: dma-controller@...fec00 {
> +		compatible = "atmel,at91sam9g45-dma";
> +		reg = <0xffffec00 0x200>;
> +		interrupts-extended = <&dumb_irq1_demux 0>;
> +	};
> -- 
> 1.9.1
> 
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