Re: [RFC PATCH V2 3/8] genirq: Add runtime power management support for IRQ chips

From: Thomas Gleixner
Date: Tue Jan 26 2016 - 12:18:47 EST

On Fri, 22 Jan 2016, Ulf Hansson wrote:
> Here's a small collection of drivers that I easily picked up as
> candidates for using these new APIs.
> In principle, they would invoke these new APIs from their runtime PM callbacks.
> drivers/spi/spi-atmel.c
> drivers/spi/spi-pl022.c
> drivers/i2c/busses/i2c-omap.c
> drivers/i2c/busses/i2c-nomadik.c
> drivers/i2c/busses/i2c-sh_mobile.c
> drivers/mmc/host/mtk-sd.c
> drivers/mmc/host/mmci.c

Instead of adding those calls to each driver, we can be smart and flag the
interrupt as AUTO_RUNTIME_SUSPEND or such.

So the runtime_pm core can handle it when invoking the
dev_pm_ops->runtime_suspend()/resume() callbacks.

Unfortunately the devres stuff is exceptionally bad to be used for this, but
with some surgery it should be doable.