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| author | Jeremy Kerr <jk@ozlabs.org> | 2015-03-17 13:49:31 +0800 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2015-03-17 17:00:22 +1100 |
| commit | ecf6309f67f6df13f8b20c34559bb989f74e52d2 (patch) | |
| tree | 489016a7fc22c8a500c1e1718ed11768b5dcf6a2 /doc | |
| parent | 1988e48f3726833712764e15b300961e4f305533 (diff) | |
| download | skiboot-ecf6309f67f6df13f8b20c34559bb989f74e52d2.zip skiboot-ecf6309f67f6df13f8b20c34559bb989f74e52d2.tar.gz skiboot-ecf6309f67f6df13f8b20c34559bb989f74e52d2.tar.bz2 | |
doc/device-tree: Add descriptions for the ibm, pstate-* properties.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/device-tree/ibm,opal/power-mgt.txt | 40 |
1 files changed, 26 insertions, 14 deletions
diff --git a/doc/device-tree/ibm,opal/power-mgt.txt b/doc/device-tree/ibm,opal/power-mgt.txt index d67c1b3..0852650 100644 --- a/doc/device-tree/ibm,opal/power-mgt.txt +++ b/doc/device-tree/ibm,opal/power-mgt.txt @@ -25,18 +25,35 @@ values for optimal power efficiency. ibm,cpu-idle-state-residency-ns = <0x1 0x2 0x3> ibm,cpu-idle-state-latencies-ns = <0x1 0x2 0x3> + +ibm,pstate-ids +-------------- + +This property lists the available pstate identifiers, as signed 32-bit +big-endian values. While the identifiers are somewhat arbitrary, these define +the order of the pstates in other ibm,pstate-* properties. + + +ibm,pstate-frequencies-mhz +-------------------------- + +This property lists the frequency, in MHz, of each of the pstates listed in the +ibm,pstate-ids file. Each frequency is a 32-bit big-endian word. + + +ibm,pstate-max ibm,pstate-min ibm,pstate-nominal +------------------------------------------------ + +These properties give the maximum, minimum and nominal pstate values, as an id +specified in the ibm,pstate-ids file. + + ibm,pstate-vcss ibm,pstate-vdds ------------------------------- -During characterisation, we'd like to allow userspace to see the vdd and -vcs values exposed by the OCC. This change adds two new properties to -expose these: - - ibm,pstate-vdds - ibm,pstate-vcss - -- containing one byte per pstate, representing the Vdd or Vcs value for - that pstate. +These properties list a voltage-identifier of each of the pstates listed in +ibm,pstate-ids for the Vcs and Vdd values used for that pstate. Each VID is a +single byte. FIXME: document these: @@ -44,8 +61,3 @@ ibm,cpu-idle-state-flags ibm,cpu-idle-state-names ibm,cpu-idle-state-pmicr ibm,cpu-idle-state-pmicr-mask -ibm,pstate-frequencies-mhz -ibm,pstate-ids -ibm,pstate-max -ibm,pstate-min -ibm,pstate-nominal |