On Wed, Oct 26, 2016 at 01:51:48PM -0700, Rajat Jain wrote: > On Wed, Oct 26, 2016 at 1:46 PM, Dmitry Torokhov > <dmitry.torokhov@xxxxxxxxx> wrote: > On Wed, Oct 26, 2016 at 01:17:36PM -0700, Brian Norris wrote: > Sorry, I just saw this... Why do we need devicetree data for > discoverable bus (PCI)? How does the driver work on systems that do not > use DT? Why do we need them to behave differently? > > There are a couple of out-of-band GPIO pins from Marvell chip that can > serve as wake-up pins (wake up the CPU when asserted). The Marvell chip > has to be told which GPIO pin is to be used as the wake-up pin. The pin to > be used is system / platform dependent. (On some systems it could be > GPIO13, on others it could be GPIO14 etc depending on how the marvell chip > is wired up to the CPU). There's also calibration data. See "marvell,caldata*" and "marvell,wakeup-pin" properties. Currently only for SDIO, in Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt, but we're adding support for PCIe. Brian
