1# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/cpufreq/qemu,virtual-cpufreq.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: Virtual CPUFreq 8 9maintainers: 10 - David Dai <[email protected]> 11 - Saravana Kannan <[email protected]> 12 13description: 14 Virtual CPUFreq is a virtualized driver in guest kernels that sends performance 15 selection of its vCPUs as a hint to the host through MMIO regions. Each vCPU 16 is associated with a performance domain which can be shared with other vCPUs. 17 Each performance domain has its own set of registers for performance controls. 18 19properties: 20 compatible: 21 const: qemu,virtual-cpufreq 22 23 reg: 24 maxItems: 1 25 description: 26 Address and size of region containing performance controls for each of the 27 performance domains. Regions for each performance domain is placed 28 contiguously and contain registers for controlling DVFS(Dynamic Frequency 29 and Voltage) characteristics. The size of the region is proportional to 30 total number of performance domains. 31 32required: 33 - compatible 34 - reg 35 36additionalProperties: false 37 38examples: 39 - | 40 soc { 41 #address-cells = <1>; 42 #size-cells = <1>; 43 44 cpufreq@1040000 { 45 compatible = "qemu,virtual-cpufreq"; 46 reg = <0x1040000 0x2000>; 47 }; 48 }; 49