linux-kernel - Re: [PATCH 2/4] irqchip: mediatek: Add support for mt8173

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Date:	Wed, 10 Dec 2014 15:41:15 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Eddie Huang <eddie.huang@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, srv_heupstream@...iatek.com,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Mark Brown <broonie@...aro.org>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, Robert Richter <rrichter@...ium.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	Kumar Gala <galak@...eaurora.org>,
	Olof Johansson <olof@...om.net>,
	Thomas Gleixner <tglx@...utronix.de>, yh.chen@...iatek.com
Subject: Re: [PATCH 2/4] irqchip: mediatek: Add support for mt8173

On Wednesday 10 December 2014 22:37:13 Yingjoe Chen wrote:
> OK, I'll change to something like this in next version:

I've just taken another look at the driver and have a different
suggestion:

> --- a/Documentation/devicetree/bindings/arm/mediatek/mediatek,sysirq.txt
> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,sysirq.txt
> @@ -17,12 +17,17 @@ Required properties:
>    use the same interrupt-cells format as GIC.
>  - reg: Physical base address of the intpol registers and length of memory
>    mapped region.
> 
> +Optional properties:
> +- mediatek,intpol-number: The number of interrupts supported by intpol,
> +  default 224 if omitted.
> +
>  Example:
>         sysirq: interrupt-controller@...00100 {
>                 compatible = "mediatek,mt6589-sysirq", "mediatek,mt6577-sysirq";
>                 interrupt-controller;
>                 #interrupt-cells = >;
>                 interrupt-parent = <&gic>;
>                 reg = <0 0x10200100 0 0x1c>;
> +               mediatek,intpol-number = <224>;
>         };

The number of interrupt pins directly corresponds to the size of the reg
property in bits, so I think you can just use that and don't even need
another property.

	Arnd
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