dts/bindings/clock/st,stm32u0-pll-clock.yaml

# Copyright (c) 2024 STMicroelectronics
# SPDX-License-Identifier: Apache-2.0

description: |
  STM32U0 Main PLL node binding:

  Takes one of clk_hse, clk_hsi or clk_msi as input clock, with
  an input frequency from 2.66 to 16 MHz. PLLM factor is used to set the input
  clock in this acceptable range.

  PLL can have up to 3 output clocks and for each output clock, the
  frequency can be computed with the following formulae:

    f(PLL_P) = f(VCO clock) / PLLP  --> to ADC
    f(PLL_Q) = f(VCO clock) / PLLQ  --> to RNG
    f(PLL_R) = f(VCO clock) / PLLR  --> PLLCLK (System Clock)

      with f(VCO clock) = f(PLL clock input) × (PLLN / PLLM)

  The PLL output frequency must not exceed 122 MHz.

compatible: "st,stm32u0-pll-clock"

include: [clock-controller.yaml, base.yaml]

properties:
  "#clock-cells":
    const: 0

  clocks:
    required: true

  div-m:
    type: int
    required: true
    description: |
        Division factor M of the PLL
        input clock divider
        Valid range: 1 - 8

  mul-n:
    type: int
    required: true
    description: |
        PLL frequency multiplication factor N
        Valid range: 4 - 127

  div-p:
    type: int
    description: |
        PLL VCO division factor P
        Valid range: 2 - 32

  div-q:
    type: int
    description: |
        PLL VCO division factor Q
        Valid range: 2 - 8

  div-r:
    type: int
    required: true
    description: |
        PLL VCO division factor R
        Valid range: 2 - 8