dts/bindings/cpu/espressif,riscv.yaml

# Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd.
# SPDX-License-Identifier: Apache-2.0

description: Espressif RISC-V CPU

compatible: "espressif,riscv"

include: riscv,cpus.yaml

properties:
  clock-source:
    required: true
    type: int
    description: |
      Defines the CPU clock source, each corresponding to different frequencies:
      - 0: ESP32_CPU_CLK_SRC_XTAL - Uses the external crystal clock typically at 40 MHz.
      - 1: ESP32_CPU_CLK_SRC_PLL - Utilizes an internal PLL which operates at either
      320 MHz or 480 MHz.
      - 2: ESP32_CPU_CLK_SRC_RC_FAST - Employs an internal fast RC oscillator with
      frequency of 17.5 MHz.
    enum:
      - 0
      - 1
      - 2

  xtal-freq:
    required: true
    type: int
    description: Value of the external XTAL connected to ESP32. This is typically 40 MHz.
    enum:
      - 26000000
      - 32000000
      - 40000000