From 2f6c3d6753d5d80643802164864a9502d7bd0acb Mon Sep 17 00:00:00 2001 From: Stewart Smith Date: Thu, 16 Jul 2015 14:12:39 +1000 Subject: Add OPAL_READ_TPO and OPAL_WRITE_TPO documentation Signed-off-by: Stewart Smith --- doc/opal-api/opal-read-write-tpo-103-104.txt | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 doc/opal-api/opal-read-write-tpo-103-104.txt (limited to 'doc') diff --git a/doc/opal-api/opal-read-write-tpo-103-104.txt b/doc/opal-api/opal-read-write-tpo-103-104.txt new file mode 100644 index 0000000..0040615 --- /dev/null +++ b/doc/opal-api/opal-read-write-tpo-103-104.txt @@ -0,0 +1,15 @@ +OPAL_READ_TPO and OPAL_WRITE_TPO +-------------------------------- + +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. -- cgit v1.1