Several drivers create their own devicetree property when they register
poweroff capabilities. This is for example the case for mfd, regulator
or power drivers which define "vendor,system-power-controller" property.
This patch adds support for a standard property "poweroff-source"
which marks the device as able to shutdown the system.
Signed-off-by: NRomain Perier <romain.perier@gmail.com>
Acked-by: NGrant Likely <grant.likely@linaro.org>
Signed-off-by: NMark Brown <broonie@kernel.org>