On Mon, May 08, 2017 at 06:21:10PM +0200, Ulf Hansson wrote:

During power off, after the GPIO pin has been asserted, some devices like
the Wifi chip from TI, Wl18xx, needs a delay before the host continues with
clock gating and turning off regulators as to follow a graceful shutdown
sequence.

Therefore invent an optional power-off-delay-us DT binding for
mmc-pwrseq-simple, to allow us to support this constraint.

Do you really need this to be programmable per device. A delay is not 
going to hurt devices that don't need it.

Sorry, but this is exactly what I don't like about "simple" bindings: 
adding one property at a time.

Rob