On Fri, Jun 8, 2018 at 5:50 PM, Jason Gunthorpe <jgg@xxxxxxxx> wrote: > On Fri, Jun 08, 2018 at 09:02:09AM +0200, Linus Walleij wrote: >> An SPI TPM device managed directly on an embedded board using >> the SPI bus and some GPIO or similar line as IRQ handler will >> pass the IRQn from the TPM device associated with the SPI >> device. This is already handled by the SPI core, so make sure >> to pass this down to the core as well. >> >> (The TPM core habit of using -1 to signal no IRQ is dubious >> (as IRQ 0 is NO_IRQ) but I do not want to mess with that >> semantic in this patch.) > > Unless something has changed, there is no cross-arch constant called > NO_IRQ, and the few arches that do define it, tend to use -1.. AFAIU the idea is that for archs that don't define it, it is implicitly 0. I just refer to this, albeit it's been 7 years: https://lwn.net/Articles/470820/ Yours, Linus Walleij
