dt-bindings: iio: adc: Migrate MCP3911 documentation to yaml

* Microchip MCP3911 Dual channel analog front end (ADC)

Required properties:

 - compatible: Should be "microchip,mcp3911"

 - reg: SPI chip select number for the device

Recommended properties:

 - spi-max-frequency: Definition as per

	 Documentation/devicetree/bindings/spi/spi-bus.txt.

	 Max frequency for this chip is 20MHz.

Optional properties:

 - clocks: Phandle and clock identifier for sampling clock

 - interrupt-parent: Phandle to the parent interrupt controller

 - interrupts: IRQ line for the ADC

 - microchip,device-addr: Device address when multiple MCP3911 chips are present on the

	same SPI bus. Valid values are 0-3. Defaults to 0.

 - vref-supply: Phandle to the external reference voltage supply.

Example:

adc@0 {

	compatible = "microchip,mcp3911";

	reg = <0>;

	interrupt-parent = <&gpio5>;

	interrupts = <15 IRQ_TYPE_EDGE_RISING>;

	spi-max-frequency = <20000000>;

	microchip,device-addr = <0>;

	vref-supply = <&vref_reg>;

	clocks = <&xtal>;

};

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

# Copyright 2019 Marcus Folkesson <marcus.folkesson@gmail.com>

%YAML 1.2

---

$id: "http://devicetree.org/schemas/bindings/iio/adc/microchip,mcp3911.yaml#"

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

title: Microchip MCP3911 Dual channel analog front end (ADC)

maintainers:

  - Marcus Folkesson <marcus.folkesson@gmail.com>

  - Kent Gustavsson <nedo80@gmail.com>

description: |

  Bindings for the Microchip MCP3911 Dual channel ADC device. Datasheet can be

  found here: https://ww1.microchip.com/downloads/en/DeviceDoc/20002286C.pdf

properties:

  compatible:

    enum:

      - microchip,mcp3911

  reg:

    maxItems: 1

  spi-max-frequency:

    maximum: 20000000

  clocks:

    description: |

      Phandle and clock identifier for external sampling clock.

      If not specified, the internal crystal oscillator will be used.

    maxItems: 1

  interrupts:

    description: IRQ line of the ADC

    maxItems: 1

  microchip,device-addr:

    description: Device address when multiple MCP3911 chips are present on the same SPI bus.

    allOf:

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

      - enum: [0, 1, 2, 3]

      - default: 0

  vref-supply:

    description: |

      Phandle to the external reference voltage supply.

      If not specified, the internal voltage reference (1.2V) will be used.

required:

  - compatible

  - reg

examples:

  - |

    spi {

      #address-cells = <1>;

      #size-cells = <0>;

      adc@0 {

        compatible = "microchip,mcp3911";

        reg = <0>;

        interrupt-parent = <&gpio5>;

        interrupts = <15 2>;

        spi-max-frequency = <20000000>;

        microchip,device-addr = <0>;

        vref-supply = <&vref_reg>;

        clocks = <&xtal>;

      };

    };

L:	linux-iio@vger.kernel.org

S:	Supported

F:	drivers/iio/adc/mcp3911.c

F:	Documentation/devicetree/bindings/iio/adc/mcp3911.txt

F:	Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml

MICROCHIP NAND DRIVER

M:	Tudor Ambarus <tudor.ambarus@microchip.com>