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

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Date:	Wed, 10 Dec 2014 22:37:13 +0800
From:	Yingjoe Chen <yingjoe.chen@...iatek.com>
To:	Arnd Bergmann <arnd@...db.de>
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


Hi Arnd,

On Wed, 2014-12-10 at 12:00 +0100, Arnd Bergmann wrote:
> On Wednesday 10 December 2014 18:50:00 Eddie Huang wrote:
> > From: Yingjoe Chen <yingjoe.chen@...iatek.com>
> > 
> > MT8173 intpol have 32 more irq pins, add support to it.
> > 
> > Signed-off-by: Yingjoe Chen <yingjoe.chen@...iatek.com>
> > Signed-off-by: Eddie Huang <eddie.huang@...iatek.com>
> > 
> 
> How about adding a property for the number of irq pins and leave the
> old compatible string in place? I don't think it would be good if
> we have to update this driver for each new SoC that uses this
> irqchip just to change one number.
> 
> 	Arnd

OK, I'll change to something like this in next version:


--- 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 = <3>;
                interrupt-parent = <&gic>;
                reg = <0 0x10200100 0 0x1c>;
+               mediatek,intpol-number = <224>;
        };

Joe.C


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