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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:13:47 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:13:47 +0000 |
commit | 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 (patch) | |
tree | bcf648efac40ca6139842707f0eba5a4496a6dd2 /docs/components/fconf/mpmm-bindings.rst | |
parent | Initial commit. (diff) | |
download | arm-trusted-firmware-upstream.tar.xz arm-trusted-firmware-upstream.zip |
Adding upstream version 2.8.0+dfsg.upstream/2.8.0+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'docs/components/fconf/mpmm-bindings.rst')
-rw-r--r-- | docs/components/fconf/mpmm-bindings.rst | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/docs/components/fconf/mpmm-bindings.rst b/docs/components/fconf/mpmm-bindings.rst new file mode 100644 index 0000000..d3cc857 --- /dev/null +++ b/docs/components/fconf/mpmm-bindings.rst @@ -0,0 +1,48 @@ +Maximum Power Mitigation Mechanism (MPMM) Bindings +================================================== + +|MPMM| support cannot be determined at runtime by the firmware. Instead, these +DTB bindings allow the platform to communicate per-core support for |MPMM| via +the ``HW_CONFIG`` device tree blob. + +Bindings +^^^^^^^^ + +.. contents:: + :local: + +``/cpus/cpus/cpu*`` node properties +""""""""""""""""""""""""""""""""""" + +The ``cpu`` node has been augmented to allow the platform to indicate support +for |MPMM| on a given core. + ++-------------------+-------+-------------+------------------------------------+ +| Property name | Usage | Value type | Description | ++===================+=======+=============+====================================+ +| ``supports-mpmm`` | O | ``<empty>`` | If present, indicates that |MPMM| | +| | | | is available on this core. | ++-------------------+-------+-------------+------------------------------------+ + +Example +^^^^^^^ + +An example system offering two cores, one with support for |MPMM| and one +without, can be described as follows: + +.. code-block:: + + cpus { + #address-cells = <2>; + #size-cells = <0>; + + cpu0@00000 { + ... + + supports-mpmm; + }; + + cpu1@00100 { + ... + }; + } |