linux-kernel - Re: [RFC part2 PATCH 8/9] ACPI / ARM64: Update acpi_register_gsi to register with the core IRQ subsystem

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Date:	Thu, 05 Dec 2013 22:01:28 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
CC:	linux-arm-kernel@...ts.infradead.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Olof Johansson <olof@...om.net>, linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	linaro-acpi@...ts.linaro.org, linux-acpi@...r.kernel.org,
	Amit Daniel Kachhap <amit.daniel@...sung.com>,
	Jon Masters <jonathan@...masters.org>,
	Grant Likely <grant.likely@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [RFC part2 PATCH 8/9] ACPI / ARM64: Update acpi_register_gsi
 to register with the core IRQ subsystem

On 2013年12月05日 11:48, Arnd Bergmann wrote:
> On Tuesday 03 December 2013, Hanjun Guo wrote:
>> +       /*
>> +        * ACPI have no bindings to indicate SPI or PPI, so we
>> +        * use different mappings from DT in ACPI.
>> +        *
>> +        * For FDT
>> +        * PPI interrupt: in the range [0, 15];
>> +        * SPI interrupt: in the range [0, 987];
>> +        *
>> +        * For ACPI, using identity mapping for hwirq:
>> +        * PPI interrupt: in the range [16, 31];
>> +        * SPI interrupt: in the range [32, 1019];
> This difference might cause endless confusion. Can't you register PPI and SPI as
> separate IRQ controllers to have the same number space that we normally have?

In ACPI, they used a conception named GSI (Global System Interrupts)
for irq, GSI number can not be the same even if there are muti GICs,
so I use the identity mapping for hwirq for ACPI.

Thanks you very much for your comments :)

Hanjun
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