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OPAL_READ_TPO and OPAL_WRITE_TPO
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TPO is a Timed Power On facility.
It is an OPTIONAL part of the OPAL spec.
If a platform supports Timed Power On (TPO), the RTC node in the device tree (itself under the "ibm,opal" node will have the has-tpo property:
rtc {
compatible = "ibm,opal-rtc";
has-tpo;
};
If the "has-tpo" proprety is *NOT* present then OPAL does *NOT* support TPO.
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