On Sun, Jul 28, 2013 at 4:43 PM, Mark Brown <[email protected]> wrote:
> Most SPI drivers that implement runtime PM support use identical code to > do so: they acquire a runtime PM lock in prepare_transfer_hardware() and > then they release it in unprepare_transfer_hardware(). The variations in > this are mostly missing error checking and the choice to use autosuspend. > > Since these runtime PM calls are normally the only thing in the prepare > and unprepare callbacks and the autosuspend API transparently does the > right thing on devices with autosuspend disabled factor all of this out > into the core with a flag to enable the behaviour. > > Signed-off-by: Mark Brown <[email protected]> Acked-by: Linus Walleij <[email protected]> > + * @auto_runtime_pm: the core should ensure a runtime PM reference is held > + * while the hardware is prepared I'd mention here that the reference is taken on the parent device of the SPI master, i.e. the very platform or AMBA device, so that it will hit upwards to the bus. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
