Documentation/devicetree/bindings/clock/imx7ulp-scg-clock.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/clock/imx7ulp-scg-clock.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Clock bindings for Freescale i.MX7ULP System Clock Generation (SCG) modules

maintainers:
  - A.s. Dong <aisheng.dong@nxp.com>

description: |
  i.MX7ULP Clock functions are under joint control of the System
  Clock Generation (SCG) modules, Peripheral Clock Control (PCC)
  modules, and Core Mode Controller (CMC)1 blocks

  The clocking scheme provides clear separation between M4 domain
  and A7 domain. Except for a few clock sources shared between two
  domains, such as the System Oscillator clock, the Slow IRC (SIRC),
  and and the Fast IRC clock (FIRCLK), clock sources and clock
  management are separated and contained within each domain.

  M4 clock management consists of SCG0, PCC0, PCC1, and CMC0 modules.
  A7 clock management consists of SCG1, PCC2, PCC3, and CMC1 modules.

  Note: this binding doc is only for A7 clock domain.

  The System Clock Generation (SCG) is responsible for clock generation
  and distribution across this device. Functions performed by the SCG
  include: clock reference selection, generation of clock used to derive
  processor, system, peripheral bus and external memory interface clocks,
  source selection for peripheral clocks and control of power saving
  clock gating mode.

  The clock consumer should specify the desired clock by having the clock
  ID in its "clocks" phandle cell.
  See include/dt-bindings/clock/imx7ulp-clock.h for the full list of
  i.MX7ULP clock IDs of each module.

properties:
  compatible:
    const: fsl,imx7ulp-scg1

  reg:
    maxItems: 1

  '#clock-cells':
    const: 1

  clocks:
    items:
      - description: rtc osc
      - description: system osc
      - description: slow internal reference clock
      - description: fast internal reference clock
      - description: usb PLL

  clock-names:
    items:
      - const: rosc
      - const: sosc
      - const: sirc
      - const: firc
      - const: upll

required:
  - compatible
  - reg
  - '#clock-cells'
  - clocks
  - clock-names

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/imx7ulp-clock.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>

    clock-controller@403e0000 {
        compatible = "fsl,imx7ulp-scg1";
        reg = <0x403e0000 0x10000>;
        clocks = <&rosc>, <&sosc>, <&sirc>,
                 <&firc>, <&upll>;
        clock-names = "rosc", "sosc", "sirc",
                      "firc", "upll";
        #clock-cells = <1>;
    };

    mmc@40380000 {
        compatible = "fsl,imx7ulp-usdhc";
        reg = <0x40380000 0x10000>;
        interrupts = <GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&scg1 IMX7ULP_CLK_NIC1_BUS_DIV>,
                 <&scg1 IMX7ULP_CLK_NIC1_DIV>,
                 <&pcc2 IMX7ULP_CLK_USDHC1>;
        clock-names ="ipg", "ahb", "per";
        bus-width = <4>;
    };