1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/cpufreq/airoha,en7581-cpufreq.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: Airoha EN7581 CPUFreq 8 9maintainers: 10 - Christian Marangi <ansuelsmth@gmail.com> 11 12description: | 13 On newer Airoha SoC, CPU Frequency is scaled indirectly with SMC commands 14 to ATF. 15 16 A virtual clock is exposed. This virtual clock is a get-only clock and 17 is used to expose the current global CPU clock. The frequency info comes 18 by the output of the SMC command that reports the clock in MHz. 19 20 The SMC sets the CPU clock by providing an index, this is modelled as 21 performance states in a power domain. 22 23 CPUs can't be individually scaled as the CPU frequency is shared across 24 all CPUs and is global. 25 26properties: 27 compatible: 28 const: airoha,en7581-cpufreq 29 30 '#clock-cells': 31 const: 0 32 33 '#power-domain-cells': 34 const: 0 35 36 operating-points-v2: true 37 38required: 39 - compatible 40 - '#clock-cells' 41 - '#power-domain-cells' 42 - operating-points-v2 43 44additionalProperties: false 45 46examples: 47 - | 48 performance-domain { 49 compatible = "airoha,en7581-cpufreq"; 50 51 operating-points-v2 = <&cpu_smcc_opp_table>; 52 53 #power-domain-cells = <0>; 54 #clock-cells = <0>; 55 }; 56