mfd: dt: tps6586x: Add power off control
Add DT property "ti,system-power-controller" telling whether or not this pmic is in charge of controlling the system power, so the power off routine can be hooked up to system call "pm_power_off". Based on the work by: Dan Willemsen <dwillemsen@nvidia.com> Signed-off-by: NBill Huang <bilhuang@nvidia.com> Tested-by: NStephen Warren <swarren@wwwdotorg.org> Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>
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