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Date:   Wed, 25 Mar 2020 14:15:16 +0000
From:   Marc Zyngier <maz@kernel.org>
To:     Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc:     Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        linux-mips@vger.kernel.org, Huacai Chen <chenhc@lemote.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
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        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
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        Allison Randal <allison@lohutok.net>,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH v8 06/11] irqchip: mips-cpu: Convert to simple domain
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On 2020-03-25 13:59, Jiaxun Yang wrote:

[...]

>>> So probably we can use legacy domain when  MIPS IRQ BASE is in the
>>> range of legacy IRQ
>>> and switch to simple domain when it's not in that range?
>> 
>> No, see below.
>> 
>>> Here in Loongson systems IRQ 0-15 is occupied by I8259 so I did this
>>> hack.
>> 
>> Well, if you have to consider which Linux IRQ gets assigned,
>> then your platform is definitely not ready for non-legacy
>> irqdomains. Just stick to legacy for now until you have removed
>> all the code that knows the hwirq mapping.
> 
> Thanks.
> 
> So I have to allocate irq_desc here in driver manually?

No, you are probably better off just dropping this patch, as MIPS
doesn't seem to be ready for a wholesale switch to virtual interrupts.

         M.
-- 
Jazz is not dead. It just smells funny...