linux-kernel - Re: [RFC 4/4] irqchip: gicv2m: Add supports for ARM GICv2m MSI(-X)

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Date:	Mon, 29 Sep 2014 16:42:18 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	suravee.suthikulpanit@....com, will.deacon@....com,
	liviu.dudau@....com, marc.zyngier@....com, mark.rutland@....com,
	catalin.marinas@....com, jason@...edaemon.net, tglx@...utronix.de,
	robh+dt@...nel.org, bhelgaas@...gle.com,
	Mark Rutland <Mark.Rutland@....com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	Marc Zyngier <Marc.Zyngier@....com>, linux-pci@...r.kernel.org,
	Will Deacon <Will.Deacon@....com>,
	linux-kernel@...r.kernel.org,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [RFC 4/4] irqchip: gicv2m: Add supports for ARM GICv2m MSI(-X)

On Sunday 28 September 2014 15:53:30 suravee.suthikulpanit@....com wrote:
> +       interrupt-controller@...01000 {
> +               compatible = "arm,gic-400";
> +               #interrupt-cells = >;
> +               #address-cells = <2>;
> +               #size-cells = <2>;
> +               interrupt-controller;
> +               interrupts = <1 8 0xf04>;
> +               ranges = <0 0 0 0xe1100000 0 0x100000>;
> +               reg = <0x0 0xe1110000 0 0x01000>,
> +                     <0x0 0xe112f000 0 0x02000>,
> +                     <0x0 0xe1140000 0 0x10000>,
> +                     <0x0 0xe1160000 0 0x10000>;
> +               v2m0: v2m@...000 {
> +                       compatible = "arm,gic-v2m-frame";
> +                       msi-controller;
> +                       reg = <0x0 0x80000 0 0x1000>;
> +               };
> +
> +               ....
> +
> +               v2mN: v2m@...000 {
> +                       compatible = "arm,gic-v2m-frame";
> +                       msi-controller;
> +                       reg = <0x0 0x90000 0 0x1000>;
> +               };
> +       };
> 

Could this just be modeled as a separate msi-controller node
outside of the GIC?

Instead of the arm,msi-base-spi/arm,msi-num-spis properties, how
about using regular "interrupts"/"interrupt-parent" properties listing
the exact interrupts? That would also make it more flexible in
case the same layout is used with a parent other than the GIC.

	ARnd
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