Documentation/devicetree/bindings/clock/rockchip,px30-cru.yaml

# SPDX-License-Identifier: (GPL-2.0+ OR MIT)
%YAML 1.2
---
$id: http://devicetree.org/schemas/clock/rockchip,px30-cru.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Rockchip PX30 Clock and Reset Unit (CRU)

maintainers:
  - Elaine Zhang <zhangqing@rock-chips.com>
  - Heiko Stuebner <heiko@sntech.de>

description: |
  The PX30 clock controller generates and supplies clocks to various
  controllers within the SoC and also implements a reset controller for SoC
  peripherals.
  Each clock is assigned an identifier and client nodes can use this identifier
  to specify the clock which they consume. All available clocks are defined as
  preprocessor macros in the dt-bindings/clock/px30-cru.h headers and can be
  used in device tree sources. Similar macros exist for the reset sources in
  these files.
  There are several clocks that are generated outside the SoC. It is expected
  that they are defined using standard clock bindings with following
  clock-output-names:
    - "xin24m"     - crystal input       - required
    - "xin32k"     - rtc clock           - optional
    - "i2sx_clkin" - external I2S clock  - optional
    - "gmac_clkin" - external GMAC clock - optional

properties:
  compatible:
    enum:
      - rockchip,px30-cru
      - rockchip,px30-pmucru

  reg:
    maxItems: 1

  "#clock-cells":
    const: 1

  "#reset-cells":
    const: 1

  clocks:
    minItems: 1
    items:
      - description: Clock for both PMUCRU and CRU
      - description: Clock for CRU (sourced from PMUCRU)

  clock-names:
    minItems: 1
    items:
      - const: xin24m
      - const: gpll

  rockchip,grf:
    $ref: /schemas/types.yaml#/definitions/phandle
    description:
      Phandle to the syscon managing the "general register files" (GRF),
      if missing pll rates are not changeable, due to the missing pll
      lock status.

required:
  - compatible
  - reg
  - clocks
  - clock-names
  - "#clock-cells"
  - "#reset-cells"

allOf:
  - if:
      properties:
        compatible:
          contains:
            const: rockchip,px30-cru

    then:
      properties:
        clocks:
          minItems: 2

        clock-names:
          minItems: 2

    else:
      properties:
        clocks:
          maxItems: 1

        clock-names:
          maxItems: 1

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/px30-cru.h>

    pmucru: clock-controller@ff2bc000 {
      compatible = "rockchip,px30-pmucru";
      reg = <0xff2bc000 0x1000>;
      clocks = <&xin24m>;
      clock-names = "xin24m";
      rockchip,grf = <&grf>;
      #clock-cells = <1>;
      #reset-cells = <1>;
    };

    cru: clock-controller@ff2b0000 {
      compatible = "rockchip,px30-cru";
      reg = <0xff2b0000 0x1000>;
      clocks = <&xin24m>, <&pmucru PLL_GPLL>;
      clock-names = "xin24m", "gpll";
      rockchip,grf = <&grf>;
      #clock-cells = <1>;
      #reset-cells = <1>;
    };