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

Hanjun Guo
2013-12-05T14:01:53Z

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