On Thu, Mar 4, 2021 at 10:40 PM Hector Martin <marcan@xxxxxxxxx> wrote: > This implements the 'nonposted-mmio' and 'posted-mmio' boolean > properties. Placing these properties in a bus marks all child devices as > requiring non-posted or posted MMIO mappings. If no such properties are > found, the default is posted MMIO. > > of_mmio_is_nonposted() performs the tree walking to determine if a given > device has requested non-posted MMIO. > > of_address_to_resource() uses this to set the IORESOURCE_MEM_NONPOSTED > flag on resources that require non-posted MMIO. > > of_iomap() and of_io_request_and_map() then use this flag to pick the > correct ioremap() variant. > > This mechanism is currently restricted to Apple ARM platforms, as an > optimization. > > Signed-off-by: Hector Martin <marcan@xxxxxxxxx> This is fine with me atleast given that the nonposted IO is acceptable. Caching the quirk state in a static local is maybe a bit overoptimized but if the compiler can't see it but we can, why not. Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Yours, Linus Walleij
