One functionality provided by the SCPI handler is frequency scaling, which allows to switch the one CPU cluster between several operating points, each specifying a matching frequency and CPU voltage. The actual table is specified in firmware and can be queried by Linux using standardised SCPI calls.
Signed-off-by: Andre Przywara <[email protected]> --- arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi index ef6f10e..58c3675 100644 --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi @@ -61,6 +61,7 @@ device_type = "cpu"; reg = <0>; enable-method = "psci"; + clocks = <&scpi_dvfs 0>; }; cpu1: cpu@1 { @@ -68,6 +69,7 @@ device_type = "cpu"; reg = <1>; enable-method = "psci"; + clocks = <&scpi_dvfs 0>; }; cpu2: cpu@2 { @@ -75,6 +77,7 @@ device_type = "cpu"; reg = <2>; enable-method = "psci"; + clocks = <&scpi_dvfs 0>; }; cpu3: cpu@3 { @@ -82,6 +85,7 @@ device_type = "cpu"; reg = <3>; enable-method = "psci"; + clocks = <&scpi_dvfs 0>; }; }; @@ -148,6 +152,17 @@ compatible = "arm,scpi"; mboxes = <&mailbox 0>; shmem = <&cpu_scp_mem>; + + scpi-clocks { + compatible = "arm,scpi-clocks"; + + scpi_dvfs: scpi_dvfs_clocks { + compatible = "arm,scpi-dvfs-clocks"; + #clock-cells = <1>; + clock-indices = <0>; + clock-output-names = "cpu_clk"; + }; + }; }; soc { -- 2.9.0
