dt-bindings: backlight: qcom-wled: Convert the wled bindings to .yaml format

Binding for Qualcomm Technologies, Inc. WLED driver

WLED (White Light Emitting Diode) driver is used for controlling display

backlight that is part of PMIC on Qualcomm Technologies, Inc. reference

platforms. The PMIC is connected to the host processor via SPMI bus.

- compatible

	Usage:        required

	Value type:   <string>

	Definition:   should be one of:

			"qcom,pm8941-wled"

			"qcom,pmi8998-wled"

			"qcom,pm660l-wled"

- reg

	Usage:        required

	Value type:   <prop encoded array>

	Definition:   Base address of the WLED modules.

- default-brightness

	Usage:        optional

	Value type:   <u32>

	Definition:   brightness value on boot, value from: 0-4095.

		      Default: 2048

- label

	Usage:        required

	Value type:   <string>

	Definition:   The name of the backlight device

- qcom,cs-out

	Usage:        optional

	Value type:   <bool>

	Definition:   enable current sink output.

		      This property is supported only for PM8941.

- qcom,cabc

	Usage:        optional

	Value type:   <bool>

	Definition:   enable content adaptive backlight control.

- qcom,ext-gen

	Usage:        optional

	Value type:   <bool>

	Definition:   use externally generated modulator signal to dim.

		      This property is supported only for PM8941.

- qcom,current-limit

	Usage:        optional

	Value type:   <u32>

	Definition:   mA; per-string current limit; value from 0 to 25 with

		      1 mA step. Default 20 mA.

		      This property is supported only for pm8941.

- qcom,current-limit-microamp

	Usage:        optional

	Value type:   <u32>

	Definition:   uA; per-string current limit; value from 0 to 30000 with

		      2500 uA step. Default 25 mA.

- qcom,current-boost-limit

	Usage:        optional

	Value type:   <u32>

	Definition:   mA; boost current limit.

		      For pm8941: one of: 105, 385, 525, 805, 980, 1260, 1400,

		      1680. Default: 805 mA.

		      For pmi8998: one of: 105, 280, 450, 620, 970, 1150, 1300,

		      1500. Default: 970 mA.

- qcom,switching-freq

	Usage:        optional

	Value type:   <u32>

	 Definition:   kHz; switching frequency; one of: 600, 640, 685, 738,

		       800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200,

		       4800, 9600.

		       Default: for pm8941: 1600 kHz

				for pmi8998: 800 kHz

- qcom,ovp

	Usage:        optional

	Value type:   <u32>

	Definition:   V; Over-voltage protection limit; one of:

		      27, 29, 32, 35. Default: 29V

		      This property is supported only for PM8941.

- qcom,ovp-millivolt

	Usage:        optional

	Value type:   <u32>

	Definition:   mV; Over-voltage protection limit;

		      For pmi8998: one of 18100, 19600, 29600, 31100.

		      Default 29600 mV.

		      If this property is not specified for PM8941, it

		      falls back to "qcom,ovp" property.

- qcom,num-strings

	Usage:        optional

	Value type:   <u32>

	Definition:   #; number of led strings attached;

		      value: For PM8941 from 1 to 3. Default: 2

			     For PMI8998 from 1 to 4.

- interrupts

	Usage:        optional

	Value type:   <prop encoded array>

	Definition:   Interrupts associated with WLED. This should be

		      "short" and "ovp" interrupts. Interrupts can be

		      specified as per the encoding listed under

		      Documentation/devicetree/bindings/spmi/

		      qcom,spmi-pmic-arb.txt.

- interrupt-names

	Usage:        optional

	Value type:   <string>

	Definition:   Interrupt names associated with the interrupts.

		      Must be "short" and "ovp". The short circuit detection

		      is not supported for PM8941.

- qcom,enabled-strings

	Usage:        optional

	Value tyoe:   <u32 array>

	Definition:   Array of the WLED strings numbered from 0 to 3. Each

		      string of leds are operated individually. Specify the

		      list of strings used by the device. Any combination of

		      led strings can be used.

- qcom,external-pfet

	Usage:        optional

	Value type:   <bool>

	Definition:   Specify if external PFET control for short circuit

		      protection is used. This property is supported only

		      for PMI8998.

- qcom,auto-string-detection

	Usage:        optional

	Value type:   <bool>

	Definition:   Enables auto-detection of the WLED string configuration.

		      This feature is not supported for PM8941.

Example:

pm8941-wled@d800 {

	compatible = "qcom,pm8941-wled";

	reg = <0xd800>;

	label = "backlight";

	qcom,cs-out;

	qcom,current-limit = <20>;

	qcom,current-boost-limit = <805>;

	qcom,switching-freq = <1600>;

	qcom,ovp = <29>;

	qcom,num-strings = <2>;

	qcom,enabled-strings = <0 1>;

};

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/leds/backlight/qcom-wled.yaml#

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

title: Binding for Qualcomm Technologies, Inc. WLED driver

maintainers:

  - Bjorn Andersson <bjorn.andersson@linaro.org>

  - Kiran Gunda <kgunda@codeaurora.org>

description: |

  WLED (White Light Emitting Diode) driver is used for controlling display

  backlight that is part of PMIC on Qualcomm Technologies, Inc. reference

  platforms. The PMIC is connected to the host processor via SPMI bus.

properties:

  compatible:

    enum:

      - qcom,pm8941-wled

      - qcom,pmi8998-wled

      - qcom,pm660l-wled

  reg:

    maxItems: 1

  default-brightness:

    description: |

      brightness value on boot.

    minimum: 0

    maximum: 4095

    default: 2048

  label: true

  qcom,cs-out:

    description: |

      enable current sink output.

      This property is supported only for WLED3.

    type: boolean

  qcom,cabc:

    description: |

      enable content adaptive backlight control.

    type: boolean

  qcom,ext-gen:

    description: |

      use externally generated modulator signal to dim.

      This property is supported only for WLED3.

    type: boolean

  qcom,current-limit:

    description: |

      mA; per-string current limit.

      This property is supported only for WLED3.

    allOf:

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

    default: 20

    minimum: 0

    maximum: 25

  qcom,current-limit-microamp:

    description: |

      uA; per-string current limit.

    default: 25

    minimum: 0

    maximum: 30000

    multipleOf: 25

  qcom,current-boost-limit:

    description: |

      mA; boost current limit.

    allOf:

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

  qcom,switching-freq:

    description: |

      kHz; switching frequency.

    allOf:

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

      - enum: [ 600, 640, 685, 738, 800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200, 4800, 9600 ]

  qcom,ovp:

    description: |

      V; Over-voltage protection limit.

      This property is supported only for WLED3.

    allOf:

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

      - enum: [ 27, 29, 32, 35 ]

      - default: 29

  qcom,ovp-millivolt:

    description: |

      Over-voltage protection limit. This property is for WLED4 only.

    allOf:

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

      - enum: [ 18100, 19600, 29600, 31100 ]

      - default: 29600

  qcom,num-strings:

    description: |

      number of led strings attached.

    allOf:

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

  qcom,enabled-strings:

    description: |

      Array of the WLED strings numbered from 0 to 3. Each

      string of leds are operated individually. Specify the

      list of strings used by the device. Any combination of

      led strings can be used.

    allOf:

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

    minItems: 1

    maxItems: 4

  qcom,external-pfet:

    description: |

      Specify if external PFET control for short circuit

      protection is used. This property is supported only

      for WLED4.

    type: boolean

  qcom,auto-string-detection:

    description: |

      Enables auto-detection of the WLED string configuration.

      This feature is not supported for WLED3.

    type: boolean

  interrupts:

    minItems: 1

    items:

      - description: over voltage protection interrupt.

      - description: short circuit interrupt.

  interrupt-names:

    minItems: 1

    items:

      - const: ovp

      - const: short

allOf:

  - if:

      properties:

        compatible:

          contains:

            const: qcom,pm8941-wled

    then:

      properties:

        qcom,current-boost-limit:

          enum: [ 105, 385, 525, 805, 980, 1260, 1400, 1680 ]

          default: 805

        qcom,switching-freq:

          default: 1600

        qcom,num-strings:

          enum: [ 1, 2, 3 ]

        interrupts:

          maxItems: 1

        interrupt-names:

          maxItems: 1

    else:

      properties:

        qcom,current-boost-limit:

          enum: [ 105, 280, 450, 620, 970, 1150, 1300, 1500 ]

          default: 970

        qcom,switching-freq:

          default: 800

        qcom,num-strings:

          enum: [ 1, 2, 3, 4 ]

        interrupts:

          minItems: 2

        interrupt-names:

          minItems: 2

required:

  - compatible

  - reg

  - label

additionalProperties: false

examples:

  - |

    backlight@d800 {

        compatible = "qcom,pm8941-wled";

        reg = <0xd800 0x100>;

        label = "backlight";

        qcom,cs-out;

        qcom,current-limit = <20>;

        qcom,current-boost-limit = <805>;

        qcom,switching-freq = <1600>;

        qcom,ovp = <29>;

        qcom,num-strings = <2>;

        qcom,enabled-strings = <0 1>;

     };