Commit 6ced946a authored by Jonathan Cameron's avatar Jonathan Cameron
Browse files

dt-bindings:iio:dac:microchip,mcp4725 yaml conversion 



I'm not sure vdd-supply absolutely has to be provided if vref-supply
is, but as the previous binding docs stated it was required it seems
reasonable to leave it as such.

Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Cc: Tomas Novotny <tomas@novotny.cz>
Link: https://lore.kernel.org/r/20201031134110.724233-21-jic23@kernel.org
parent 87b8092e

Documentation/devicetree/bindings/iio/dac/mcp4725.txt

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Microchip mcp4725 and mcp4726 DAC device driver



Required properties:

	- compatible: Must be "microchip,mcp4725" or "microchip,mcp4726"

	- reg: Should contain the DAC I2C address

	- vdd-supply: Phandle to the Vdd power supply. This supply is used as a

	  voltage reference on mcp4725. It is used as a voltage reference on

	  mcp4726 if there is no vref-supply specified.



Optional properties (valid only for mcp4726):

	- vref-supply: Optional phandle to the Vref power supply. Vref pin is

	  used as a voltage reference when this supply is specified.

	- microchip,vref-buffered: Boolean to enable buffering of the external

	  Vref pin. This boolean is not valid without the vref-supply. Quoting

	  the datasheet: This is offered in cases where the reference voltage

	  does not have the current capability not to drop its voltage when

	  connected to the internal resistor ladder circuit.



Examples:



	/* simple mcp4725 */

	mcp4725@60 {

		compatible = "microchip,mcp4725";

		reg = <0x60>;

		vdd-supply = <&vdac_vdd>;

	};



	/* mcp4726 with the buffered external reference voltage */

	mcp4726@60 {

		compatible = "microchip,mcp4726";

		reg = <0x60>;

		vdd-supply = <&vdac_vdd>;

		vref-supply = <&vdac_vref>;

		microchip,vref-buffered;

	};

Documentation/devicetree/bindings/iio/dac/microchip,mcp4725.yaml

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/iio/dac/microchip,mcp4725.yaml#

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



title: Microchip mcp4725 and mcp4726 DAC



maintainers:

  - Tomas Novotny <tomas@novotny.cz>



properties:

  compatible:

    enum:

      - microchip,mcp4725

      - microchip,mcp4726



  reg:

    maxItems: 1



  vdd-supply:

    description: |

      Provides both power and acts as the reference supply on the mcp4725.

      For the mcp4726 it will be used as the reference voltage if vref-supply

      is not provided.



  vref-supply:

    description:

      Vref pin is used as a voltage reference when this supply is specified.



  microchip,vref-buffered:

    type: boolean

    description: |

      Enable buffering of the external Vref pin. This boolean is not valid

      without the vref-supply. Quoting the datasheet: This is offered in

      cases where the reference voltage does not have the current

      capability not to drop its voltage when connected to the internal

      resistor ladder circuit.



allOf:

  - if:

      not:

        properties:

          compatible:

            contains:

              const: microchip,mcp4726

    then:

      properties:

        vref-supply: false

        microchip,vref-buffered: false



required:

  - compatible

  - reg

  - vdd-supply



additionalProperties: false



examples:

  - |

    i2c {

        #address-cells = <1>;

        #size-cells = <0>;



        mcp4725@60 {

            compatible = "microchip,mcp4725";

            reg = <0x60>;

            vdd-supply = <&vdac_vdd>;

        };

    };

...