dt-bindings: clock: Convert nuvoton,npcm750-clk to DT schema

* Nuvoton NPCM7XX Clock Controller

Nuvoton Poleg BMC NPCM7XX contains an integrated clock controller, which

generates and supplies clocks to all modules within the BMC.

External clocks:

There are six fixed clocks that are generated outside the BMC. All clocks are of

a known fixed value that cannot be changed. clk_refclk, clk_mcbypck and

clk_sysbypck are inputs to the clock controller.

clk_rg1refck, clk_rg2refck and clk_xin are external clocks suppling the

network. They are set on the device tree, but not used by the clock module. The

network devices use them directly.

Example can be found below.

All available clocks are defined as preprocessor macros in:

dt-bindings/clock/nuvoton,npcm7xx-clock.h

and can be reused as DT sources.

Required Properties of clock controller:

	- compatible: "nuvoton,npcm750-clk" : for clock controller of Nuvoton

		  Poleg BMC NPCM750

	- reg: physical base address of the clock controller and length of

		memory mapped region.

	- #clock-cells: should be 1.

Example: Clock controller node:

	clk: clock-controller@f0801000 {

		compatible = "nuvoton,npcm750-clk";

		#clock-cells = <1>;

		reg = <0xf0801000 0x1000>;

		clock-names = "refclk", "sysbypck", "mcbypck";

		clocks = <&clk_refclk>, <&clk_sysbypck>, <&clk_mcbypck>;

	};

Example: Required external clocks for network:

	/* external reference clock */

	clk_refclk: clk-refclk {

		compatible = "fixed-clock";

		#clock-cells = <0>;

		clock-frequency = <25000000>;

		clock-output-names = "refclk";

	};

	/* external reference clock for cpu. float in normal operation */

	clk_sysbypck: clk-sysbypck {

		compatible = "fixed-clock";

		#clock-cells = <0>;

		clock-frequency = <800000000>;

		clock-output-names = "sysbypck";

	};

	/* external reference clock for MC. float in normal operation */

	clk_mcbypck: clk-mcbypck {

		compatible = "fixed-clock";

		#clock-cells = <0>;

		clock-frequency = <800000000>;

		clock-output-names = "mcbypck";

	};

	 /* external clock signal rg1refck, supplied by the phy */

	clk_rg1refck: clk-rg1refck {

		compatible = "fixed-clock";

		#clock-cells = <0>;

		clock-frequency = <125000000>;

		clock-output-names = "clk_rg1refck";

	};

	 /* external clock signal rg2refck, supplied by the phy */

	clk_rg2refck: clk-rg2refck {

		compatible = "fixed-clock";

		#clock-cells = <0>;

		clock-frequency = <125000000>;

		clock-output-names = "clk_rg2refck";

	};

	clk_xin: clk-xin {

		compatible = "fixed-clock";

		#clock-cells = <0>;

		clock-frequency = <50000000>;

		clock-output-names = "clk_xin";

	};

Example: GMAC controller node that consumes two clocks: a generated clk by the

clock controller and a fixed clock from DT (clk_rg1refck).

	ethernet0: ethernet@f0802000 {

		compatible = "snps,dwmac";

		reg = <0xf0802000 0x2000>;

		interrupts = <0 14 4>;

		interrupt-names = "macirq";

		clocks	= <&clk_rg1refck>, <&clk NPCM7XX_CLK_AHB>;

		clock-names = "stmmaceth", "clk_gmac";

	};

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/clock/nuvoton,npcm750-clk.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Nuvoton NPCM7XX Clock Controller

maintainers:

  - Tali Perry <tali.perry1@gmail.com>

description: >

  Nuvoton Poleg BMC NPCM7XX contains an integrated clock controller, which

  generates and supplies clocks to all modules within the BMC.

  External clocks:

  There are six fixed clocks that are generated outside the BMC. All clocks are of

  a known fixed value that cannot be changed. clk_refclk, clk_mcbypck and

  clk_sysbypck are inputs to the clock controller.

  clk_rg1refck, clk_rg2refck and clk_xin are external clocks suppling the

  network. They are set on the device tree, but not used by the clock module. The

  network devices use them directly.

  All available clocks are defined as preprocessor macros in:

  dt-bindings/clock/nuvoton,npcm7xx-clock.h

  and can be reused as DT sources.

properties:

  compatible:

    const: nuvoton,npcm750-clk

  reg:

    maxItems: 1

  '#clock-cells':

    const: 1

  clock-names:

    items:

      - const: refclk

      - const: sysbypck

      - const: mcbypck

  clocks:

    items:

      - description: refclk

      - description: sysbypck

      - description: mcbypck

required:

  - compatible

  - reg

  - '#clock-cells'

additionalProperties: false

examples:

  - |

    clock-controller@f0801000 {

        compatible = "nuvoton,npcm750-clk";

        #clock-cells = <1>;

        reg = <0xf0801000 0x1000>;

        clock-names = "refclk", "sysbypck", "mcbypck";

        clocks = <&clk_refclk>, <&clk_sysbypck>, <&clk_mcbypck>;

    };