linux-kernel - Re: [PATCH v2 2/2] dt/bindings: Add bindings for Layerscape external irqs

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Date:   Thu, 21 Dec 2017 16:44:00 -0600
From:   Rob Herring <robh@...nel.org>
To:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Andy Tang <andy.tang@....com>, Shawn Guo <shawnguo@...nel.org>,
        Alexander Stein <alexander.stein@...tec-electronic.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dt/bindings: Add bindings for Layerscape external
 irqs

On Wed, Dec 20, 2017 at 09:30:30AM +0100, Rasmus Villemoes wrote:
> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@...vas.dk>
> ---
>  .../interrupt-controller/fsl,ls-extirq.txt         | 37 ++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.txt
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.txt b/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.txt
> new file mode 100644
> index 000000000000..7e4680866364
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.txt
> @@ -0,0 +1,37 @@
> +* Freescale Layerscape external IRQs
> +
> +Some Layerscape SOCs (LS1021A, LS1043A, LS1046A) support inverting
> +the polarity of certain external interrupt lines.
> +
> +Required properties:
> +- compatible: should be "fsl,<soc-name>-extirq", e.g. "fsl,ls1021a-extirq".
> +- interrupt-controller: Identifies the node as an interrupt controller
> +- #interrupt-cells: Use the same format as specified by GIC in arm,gic.txt.
> +- interrupt-parent: phandle of GIC.
> +- syscon: phandle of Supplemental Configuration Unit (scfg) and offset
> +  to the INTPCR register.
> +- interrupts: Specifies the mapping to interrupt numbers in the parent
> +  interrupt controller. Interrupts are mapped one-to-one to parent
> +  interrupts.
> +
> +Optional properties:
> +- bit-reverse: This boolean property should be set on the LS1021A if

fsl,bit-reverse

> +  the SCFGREVCR register has been set to all-ones (which is usually
> +  the case), meaning that all reads and writes of SCFG registers are
> +  implicitly bit-reversed. Other compatible platforms do not have such
> +  a register.
> +
> +Example:
> +	extirq: extirq {

Node name should still be "interrupt-controller".

> +		compatible = "fsl,ls1021a-extirq";
> +		#interrupt-cells = <3>;
> +		interrupt-controller;
> +		interrupt-parent = <&gic>;
> +		syscon = <&scfg 0x1ac>;
> +		interrupts = <163 164 165 167 168 169>;
> +		bit-reverse;
> +	};
> +
> +
> +	interrupts-extended = <&gic GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
> +			      <&extirq GIC_SPI 1 IRQ_TYPE_LEVEL_LOW>;
> -- 
> 2.7.4
>