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