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dt-bindings: tegra30-actmon: Document OPP and interconnect properties

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Document EMC DFS OPP table and interconnect paths that will be used
for scaling of system's memory bandwidth based on memory utilization
statistics. Previously ACTMON was supposed to drive EMC clock rate
directly, but now it should do it using interconnect framework in order
to support shared voltage scaling in addition to the frequency scaling.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201104164923.21238-16-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
This commit is contained in:
Dmitry Osipenko 2020-11-04 19:48:51 +03:00 committed by Krzysztof Kozlowski
parent 881f68ed9d
commit 254a42ac93
1 changed files with 25 additions and 0 deletions
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25
Documentation/devicetree/bindings/arm/tegra/nvidia,tegra30-actmon.txt
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@ -18,8 +18,30 @@ clock-names. See ../../clock/clock-bindings.txt for details.
../../reset/reset.txt for details.
- reset-names: Must include the following entries:
- actmon
- operating-points-v2: See ../bindings/opp/opp.txt for details.
- interconnects: Should contain entries for memory clients sitting on
MC->EMC memory interconnect path.
- interconnect-names: Should include name of the interconnect path for each
interconnect entry. Consult TRM documentation for
information about available memory clients, see MEMORY
CONTROLLER section.
For each opp entry in 'operating-points-v2' table:
- opp-supported-hw: bitfield indicating SoC speedo ID mask
- opp-peak-kBps: peak bandwidth of the memory channel
Example:
dfs_opp_table: opp-table {
compatible = "operating-points-v2";
opp@12750000 {
opp-hz = /bits/ 64 <12750000>;
opp-supported-hw = <0x000F>;
opp-peak-kBps = <51000>;
};
...
};
actmon@6000c800 {
compatible = "nvidia,tegra124-actmon";
reg = <0x0 0x6000c800 0x0 0x400>;
@ -29,4 +51,7 @@ Example:
clock-names = "actmon", "emc";
resets = <&tegra_car 119>;
reset-names = "actmon";
operating-points-v2 = <&dfs_opp_table>;
interconnects = <&mc TEGRA124_MC_MPCORER &emc>;
interconnect-names = "cpu";
};