# Copyright (c) 2021, Linaro Limited
# SPDX-License-Identifier: Apache-2.0

description: |
  PLL node binding for STM32U5 devices

  It can be used to describe 3 different PLLs: PLL1, PLL2 and PLL3.

  These PLLs could take one of clk_hse, clk_hsi or clk_msis as input clock, with
  an input frequency from 4 to 16 MHz. PLLM factor is used to set the input
  clock in this acceptable range.

  Each 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
    f(PLL_Q) = f(VCO clock) / PLLQ
    f(PLL_R) = f(VCO clock) / PLLR

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

  Note: To reduce the power consumption, it is recommended to configure the VCOx
        clock output to the lowest frequency.

  The PLL output frequency must not exceed 160 MHz.

compatible: "st,stm32u5-pll-clock"

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

properties:

  "#clock-cells":
    const: 0

  clocks:
    required: true

  div-m:
    type: int
    required: true
    description: |
        Prescaler for PLLx
        input clock
        Valid range: 1 - 16

  mul-n:
    type: int
    required: true
    description: |
        PLLx multiplication factor for VCO
        Valid range: 4 - 512

  div-p:
    type: int
    description: |
        PLLx DIVP division factor
        Valid range: 1 - 128

  div-q:
    type: int
    description: |
        PLLx DIVQ division factor
        Valid range: 1 - 128

  div-r:
    type: int
    required: true
    description: |
        PLLx DIVR division factor
        On PLL1, only division by 1 and even division values are allowed.
        No restrictions for PLL2 and PLL3
        Valid range: 1 - 128
