1Binding for NVIDIA Tegra20 CPUFreq 2================================== 3 4Required properties: 5- clocks: Must contain an entry for the CPU clock. 6 See ../clocks/clock-bindings.txt for details. 7- operating-points-v2: See ../bindings/opp/opp-v2.yaml for details. 8- #cooling-cells: Should be 2. See ../thermal/thermal-cooling-devices.yaml for details. 9 10For each opp entry in 'operating-points-v2' table: 11- opp-supported-hw: Two bitfields indicating: 12 On Tegra20: 13 1. CPU process ID mask 14 2. SoC speedo ID mask 15 16 On Tegra30: 17 1. CPU process ID mask 18 2. CPU speedo ID mask 19 20 A bitwise AND is performed against these values and if any bit 21 matches, the OPP gets enabled. 22 23- opp-microvolt: CPU voltage triplet. 24 25Optional properties: 26- cpu-supply: Phandle to the CPU power supply. 27 28Example: 29 regulators { 30 cpu_reg: regulator0 { 31 regulator-name = "vdd_cpu"; 32 }; 33 }; 34 35 cpu0_opp_table: opp_table0 { 36 compatible = "operating-points-v2"; 37 38 opp@456000000 { 39 clock-latency-ns = <125000>; 40 opp-microvolt = <825000 825000 1125000>; 41 opp-supported-hw = <0x03 0x0001>; 42 opp-hz = /bits/ 64 <456000000>; 43 }; 44 45 ... 46 }; 47 48 cpus { 49 cpu@0 { 50 compatible = "arm,cortex-a9"; 51 clocks = <&tegra_car TEGRA20_CLK_CCLK>; 52 operating-points-v2 = <&cpu0_opp_table>; 53 cpu-supply = <&cpu_reg>; 54 #cooling-cells = <2>; 55 }; 56 }; 57