linux-kernel - Re: [PATCH v2 1/3] binding: irqchip: mtk-cirq: Add binding document

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Date:   Wed, 9 Nov 2016 12:26:13 -0600
From:   Rob Herring <robh@...nel.org>
To:     Youlin Pei <youlin.pei@...iatek.com>
Cc:     Marc Zyngier <marc.zyngier@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        hongkun.cao@...iatek.com, yong.wu@...iatek.com,
        erin.lo@...iatek.com, chieh-jay.liu@...iatek.com
Subject: Re: [PATCH v2 1/3] binding: irqchip: mtk-cirq: Add binding document

On Tue, Nov 01, 2016 at 07:52:00PM +0800, Youlin Pei wrote:
> This commit adds the device tree binding document for
> the mediatek cirq.
> 
> Signed-off-by: Youlin Pei <youlin.pei@...iatek.com>
> ---
>  .../interrupt-controller/mediatek,cirq.txt         |   30 ++++++++++++++++++++
>  1 file changed, 30 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/mediatek,cirq.txt
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/mediatek,cirq.txt b/Documentation/devicetree/bindings/interrupt-controller/mediatek,cirq.txt
> new file mode 100644
> index 0000000..84e8123
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/mediatek,cirq.txt
> @@ -0,0 +1,30 @@
> +* Mediatek 27xx cirq
> +
> +In Mediatek SOCs, the CIRQ is a low power interrupt controller designed to
> +works outside MCUSYS which comprises with Cortex-Ax cores,CCI and GIC.

s/works/work/

> +The external interrupts (outside MCUSYS) will feed through CIRQ and connect
> +to GIC in MCUSYS. When CIRQ is enabled, it will record the edge-sensitive
> +interrupts and generated a pulse signal to parent interrupt controller when

s/generated/generate/

> +flush command is executed. With CIRQ, MCUSYS can be completely turned off
> +to improve the system power consumption without losing interrupts.
> +
> +Required properties:
> +- compatible: should be: "mediatek,mtk-cirq".

This should be SoC specific. This is fine as a fallback if the same 
block is in many SoCs, but mediatek and mtk is a bit redundant.

> +- 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 irq parent for cirq. The parent must
> +  use the same interrupt-cells format as GIC.
> +- reg: Physical base address of the cirq registers and length of memory
> +  mapped region.
> +- mediatek,ext-irq-start: Identifies external irq start number in different
> +  SOCs.

Wouldn't this always be 32 if the GIC is the parent? If 32 is the common 
case, then use the SoC compatible to determine this value.

> +
> +Example:
> +	cirq: interrupt-controller@...04000 {
> +		compatible = "mediatek,mtk-cirq";
> +		interrupt-controller;
> +		#interrupt-cells = <3>;
> +		interrupt-parent = <&sysirq>;
> +		reg = <0 0x10204000 0 0x4000>;
> +		mediatek,ext-irq-start = <32>;
> +	};
> -- 
> 1.7.9.5
>