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Date: Sun, 31 Aug 2014 11:54:04 -0700
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Subject: Re: [PATCH 04/12] MIPS: GIC: Move MIPS_GIC_IRQ_BASE into platform irq.h
From: Andrew Bresticker <abrestic@chromium.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Ralf Baechle <ralf@linux-mips.org>, Rob Herring <robh+dt@kernel.org>,
        Pawel Moll <pawel.moll@arm.com>, Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>,
        Jeffrey Deans <jeffrey.deans@imgtec.com>,
        Markos Chandras <markos.chandras@imgtec.com>,
        Paul Burton <paul.burton@imgtec.com>,
        Thomas Gleixner <tglx@linutronix.de>,
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        Linux-MIPS <linux-mips@linux-mips.org>,
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On Sat, Aug 30, 2014 at 12:57 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Friday 29 August 2014 15:14:31 Andrew Bresticker wrote:
>> Define a generic MIPS_GIC_IRQ_BASE which is suitable for Malta and
>> the upcoming Danube board in <mach-generic/irq.h>.  Since Sead-3 is
>> different and uses a MIPS_GIC_IRQ_BASE equal to the CPU IRQ base (0),
>> define its MIPS_GIC_IRQ_BASE in <mach-sead3/irq.h>.
>>
>> Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
>>
>
> Why do you actually have to hardwire an IRQ base? Can't you move
> to the linear irqdomain code for DT based MIPS systems yet?

Neither Malta nor SEAD-3 use device-tree for interrupts yet, so they
still require a hard-coded IRQ base.  For boards using device-tree, I
stuck with a legacy IRQ domain as it allows most of the existing GIC
irqchip code to be reused.