dt-bindings: interrupt-controller: Convert img,pdc-intc to DT schema

* ImgTec Powerdown Controller (PDC) Interrupt Controller Binding

This binding specifies what properties must be available in the device tree

representation of a PDC IRQ controller. This has a number of input interrupt

lines which can wake the system, and are passed on through output interrupt

lines.

Required properties:

    - compatible: Specifies the compatibility list for the interrupt controller.

      The type shall be <string> and the value shall include "img,pdc-intc".

    - reg: Specifies the base PDC physical address(s) and size(s) of the

      addressable register space. The type shall be <prop-encoded-array>.

    - interrupt-controller: The presence of this property identifies the node

      as an interrupt controller. No property value shall be defined.

    - #interrupt-cells: Specifies the number of cells needed to encode an

      interrupt source. The type shall be a <u32> and the value shall be 2.

    - num-perips: Number of waking peripherals.

    - num-syswakes: Number of SysWake inputs.

    - interrupts: List of interrupt specifiers. The first specifier shall be the

      shared SysWake interrupt, and remaining specifies shall be PDC peripheral

      interrupts in order.

* Interrupt Specifier Definition

  Interrupt specifiers consists of 2 cells encoded as follows:

    - <1st-cell>: The interrupt-number that identifies the interrupt source.

                    0-7:  Peripheral interrupts

                    8-15: SysWake interrupts

    - <2nd-cell>: The level-sense information, encoded using the Linux interrupt

                  flags as follows (only 4 valid for peripheral interrupts):

                    0 = none (decided by software)

                    1 = low-to-high edge triggered

                    2 = high-to-low edge triggered

                    3 = both edge triggered

                    4 = active-high level-sensitive (required for perip irqs)

                    8 = active-low level-sensitive

* Examples

Example 1:

	/*

	 * TZ1090 PDC block

	 */

	pdc: pdc@02006000 {

		// This is an interrupt controller node.

		interrupt-controller;

		// Three cells to encode interrupt sources.

		#interrupt-cells = <2>;

		// Offset address of 0x02006000 and size of 0x1000.

		reg = <0x02006000 0x1000>;

		// Compatible with Meta hardware trigger block.

		compatible = "img,pdc-intc";

		// Three peripherals are connected.

		num-perips = <3>;

		// Four SysWakes are connected.

		num-syswakes = <4>;

		interrupts = <18 4 /* level */>, /* Syswakes */

			     <30 4 /* level */>, /* Peripheral 0 (RTC) */

			     <29 4 /* level */>, /* Peripheral 1 (IR) */

			     <31 4 /* level */>; /* Peripheral 2 (WDT) */

	};

Example 2:

	/*

	 * An SoC peripheral that is wired through the PDC.

	 */

	rtc0 {

		// The interrupt controller that this device is wired to.

		interrupt-parent = <&pdc>;

		// Interrupt source Peripheral 0

		interrupts = <0   /* Peripheral 0 (RTC) */

		              4>  /* IRQ_TYPE_LEVEL_HIGH */

	};

Example 3:

	/*

	 * An interrupt generating device that is wired to a SysWake pin.

	 */

	touchscreen0 {

		// The interrupt controller that this device is wired to.

		interrupt-parent = <&pdc>;

		// Interrupt source SysWake 0 that is active-low level-sensitive

		interrupts = <8 /* SysWake0 */

			      8 /* IRQ_TYPE_LEVEL_LOW */>;

	};

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/interrupt-controller/img,pdc-intc.yaml#

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

title: ImgTec Powerdown Controller (PDC) Interrupt Controller

maintainers:

  - James Hogan <jhogan@kernel.org>

description:

  ImgTec Powerdown Controller (PDC) Interrupt Controller has a number of input

  interrupt lines which can wake the system, and are passed on through output

  interrupt lines.

properties:

  compatible:

    const: img,pdc-intc

  reg:

    maxItems: 1

  interrupt-controller: true

  '#interrupt-cells':

    description: >

      <1st-cell>: The interrupt-number that identifies the interrupt source.

        0-7:  Peripheral interrupts

        8-15: SysWake interrupts

      <2nd-cell>: The level-sense information, encoded using the Linux interrupt

        flags as follows (only 4 valid for peripheral interrupts):

        0 = none (decided by software)

        1 = low-to-high edge triggered

        2 = high-to-low edge triggered

        3 = both edge triggered

        4 = active-high level-sensitive (required for perip irqs)

        8 = active-low level-sensitive

    const: 2

  num-perips:

    description: Number of waking peripherals

    $ref: /schemas/types.yaml#/definitions/uint32

    maximum: 8

  num-syswakes:

    description: Number of SysWake inputs

    $ref: /schemas/types.yaml#/definitions/uint32

    maximum: 8

  interrupts:

    description:

      First entry is syswake IRQ. Subsequent entries are 1 per peripheral.

    minItems: 2

    maxItems: 9

required:

  - compatible

  - reg

  - interrupt-controller

  - '#interrupt-cells'

  - num-perips

  - num-syswakes

  - interrupts

additionalProperties: false

examples:

  - |

    interrupt-controller@2006000 {

        compatible = "img,pdc-intc";

        reg = <0x02006000 0x1000>;

        interrupts = <18 4>, <30 4>, <29 4>, <31 4>;

        interrupt-controller;

        #interrupt-cells = <2>;

        num-perips = <3>;

        num-syswakes = <4>;

    };