mfd: pm8821-core: Add support for PMIC thermal alarm
Add a pm8xxx-tm subdevice into pm8821-core. The pm8xxx-tm device can be used to receive an interrupt when critical temperature thresholds are reached. Since PM8821 does not have an ADC, it is not possible to read a real time PM8821 die temperature using this pm8xxx-tm device. Change-Id: I3720c79a0546e8bc69044166f70dd4c313e84daa Signed-off-by:David Collins <collinsd@codeaurora.org> (cherry picked from commit 1604779c)
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