On Mon, Oct 28, 2013 at 07:29:52PM +0200, Grazvydas Ignotas wrote:

When wl12xx family of chips is connected through SDIO, we already have
that pin set up as a regulator controlled with the help of mmc
subsystem. When time comes to communicate with the chip, mmc subsystem
sees this as yet another SD card and looks for associated regulator
for it, and the board file has that set up as a fixed regulator
controlling that pin (see pandora_vmmc3 in
arch/arm/mach-omap2/board-omap3pandora.c). To prevent poweroff after
first SDIO communications are over, pm_runtime calls are used in
drivers/net/wireless/ti/wl1251/sdio.c .

Is this actually controlling VMMC though, or is it some other control?
If it's not controlling VMMC then it shouldn't say that it is.

I don't know if something similar can be done done in SPI case, but
I'm sure this is not the first your-so-called regulator misuse.

It's not the first but that doesn't make controlling something other
than a regulator through the regulator API any less broken.