• Mark Brown's avatar
    irq_domain: Standardise legacy/linear domain selection · 781d0f46
    Mark Brown authored
    A large proportion of interrupt controllers that support legacy mappings
    do so because non-DT systems need to use fixed IRQ numbers when registering
    devices via buses but can otherwise use a linear mapping. The interrupt
    controller itself typically is not affected by the mapping used and best
    practice is to use a linear mapping where possible so drivers frequently
    select at runtime depending on if a legacy range has been allocated to
    them.
    
    Standardise this behaviour by providing irq_domain_register_simple() which
    will allocate a linear mapping unless a positive first_irq is provided in
    which case it will fall back to a legacy mapping. This helps make best
    practice for irq_domain adoption clearer.
    Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
    Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
    781d0f46
IRQ-domain.txt 5.32 KB