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PM / OPP: Allow multiple OPP tables to be passed via DT 

On some platforms (Like Qualcomm's SoCs), it is not decided until
runtime on what OPPs to use. The OPP tables can be fixed at compile
time, but which table to use is found out only after reading some efuses
(sort of an prom) and knowing characteristics of the SoC.

To support such platform we need to pass multiple OPP tables per device
and hardware should be able to choose one and only one table out of
those.

Update operating-points-v2 bindings to support that.

Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Viresh Kumar 2015-06-22 14:21:38 +02:00 committed by Rafael J. Wysocki
parent b901b51807
commit a9a80e7e31
1 changed files with 60 additions and 0 deletions
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60
Documentation/devicetree/bindings/power/opp.txt
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@ -45,10 +45,21 @@ Devices supporting OPPs must set their "operating-points-v2" property with
phandle to a OPP table in their DT node. The OPP core will use this phandle to
find the operating points for the device.
Devices may want to choose OPP tables at runtime and so can provide a list of
phandles here. But only *one* of them should be chosen at runtime. This must be
accompanied by a corresponding "operating-points-names" property, to uniquely
identify the OPP tables.
If required, this can be extended for SoC vendor specfic bindings. Such bindings
should be documented as Documentation/devicetree/bindings/power/<vendor>-opp.txt
and should have a compatible description like: "operating-points-v2-<vendor>".
Optional properties:
- operating-points-names: Names of OPP tables (required if multiple OPP
tables are present), to uniquely identify them. The same list must be present
for all the CPUs which are sharing clock/voltage rails and hence the OPP
tables.
* OPP Table Node
This describes the OPPs belonging to a device. This node can have following
@ -68,6 +79,8 @@ Optional properties:
Missing property means devices have independent clock/voltage/current lines,
but they share OPP tables.
- status: Marks the OPP table enabled/disabled.
* OPP Node
@ -396,3 +409,50 @@ Example 4: Handling multiple regulators
};
};
};
Example 5: Multiple OPP tables
/ {
cpus {
cpu@0 {
compatible = "arm,cortex-a7";
...
cpu-supply = <&cpu_supply>
operating-points-v2 = <&cpu0_opp_table_slow>, <&cpu0_opp_table_fast>;
operating-points-names = "slow", "fast";
};
};
cpu0_opp_table_slow: opp_table_slow {
compatible = "operating-points-v2";
status = "okay";
opp-shared;
opp00 {
opp-hz = <600000000>;
...
};
opp01 {
opp-hz = <800000000>;
...
};
};
cpu0_opp_table_fast: opp_table_fast {
compatible = "operating-points-v2";
status = "okay";
opp-shared;
opp10 {
opp-hz = <1000000000>;
...
};
opp11 {
opp-hz = <1100000000>;
...
};
};
};