From: Finley Xiao <[email protected]> This patch documents the Rockchip cpu avs device tree binding.
Signed-off-by: Finley Xiao <[email protected]> --- .../devicetree/bindings/power/rockchip-cpu-avs.txt | 37 ++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 Documentation/devicetree/bindings/power/rockchip-cpu-avs.txt diff --git a/Documentation/devicetree/bindings/power/rockchip-cpu-avs.txt b/Documentation/devicetree/bindings/power/rockchip-cpu-avs.txt new file mode 100644 index 0000000..705f516 --- /dev/null +++ b/Documentation/devicetree/bindings/power/rockchip-cpu-avs.txt @@ -0,0 +1,37 @@ +Rockchip cpu avs device tree bindings +------------------------------------- + +Under the same frequency, the operating voltage tends to decrease with +increasing leakage. so it is necessary to adjust opp's voltage according +to leakage for power. + + +Required properties: +- compatible: Should be one of the following. + - "rockchip,rk3399-cpu-avs" - for RK3399 SoCs. +- leakage-volt-<name>: Named leakage-volt property. At runtime, the + platform can find a cpu's cluster_id according to it's cpu_id and match + leakage-volt-<name> property. The property is an array of 3-tuples + items, and each item consists of leakage and voltage like + <min-leakage-mA max-leakage-mA volt-uV>. + min-leakage: minimum leakage in mA, ranges from 0 to 254. + max-leakage: maximum leakage in mA, ranges from 0 to 254. + volt: voltage offset in mV to apply to the opp table entries. + +Example: + + cpu_avs: cpu-avs { + compatible = "rockchip,rk3399-cpu-avs"; + leakage-volt-cluster0 = < + /* mA mA uV*/ + 0 100 0 + 101 200 (-25000) + 201 254 (-50000) + >; + leakage-volt-cluster1 = < + /* mA mA uV*/ + 0 100 0 + 101 200 (-25000) + 201 254 (-50000) + >; + }; -- 1.9.1
