xref: /linux/Documentation/devicetree/bindings/iio/frequency/adi,adf41513.yaml (revision 93e4b3076b5f2d853462b9777d083c77fc0b7b23)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/frequency/adi,adf41513.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Analog Devices ADF41513 PLL Frequency Synthesizer

maintainers:
  - Rodrigo Alencar <rodrigo.alencar@analog.com>

description:
  The ADF41513 is an ultralow noise frequency synthesizer that can be used to
  implement local oscillators (LOs) as high as 26.5 GHz in the upconversion and
  downconversion sections of wireless receivers and transmitters. The ADF41510
  supports frequencies up to 10 GHz.

  https://www.analog.com/en/products/adf41510.html
  https://www.analog.com/en/products/adf41513.html

properties:
  compatible:
    enum:
      - adi,adf41510
      - adi,adf41513

  reg:
    maxItems: 1

  spi-max-frequency:
    maximum: 25000000

  clocks:
    maxItems: 1
    description: Clock that provides the reference input frequency.

  avdd1-supply:
    description: PFD and Up and Down Digital Driver Power Supply (3.3 V)

  avdd2-supply:
    description: RF Buffer and Prescaler Power Supply (3.3 V)

  avdd3-supply:
    description: N Divider Power Supply (3.3 V)

  avdd4-supply:
    description: R Divider and Lock Detector Power Supply (3.3 V)

  avdd5-supply:
    description: Sigma-Delta Modulator and SPI Power Supply (3.3 V)

  vp-supply:
    description: Charge Pump Power Supply (3.3 V)

  enable-gpios:
    description:
      GPIO that controls the chip enable pin. A logic low on this pin
      powers down the device and puts the charge pump output into
      three-state mode.
    maxItems: 1

  lock-detect-gpios:
    description:
      GPIO for lock detect functionality. When configured for digital lock
      detect, this pin will output a logic high when the PLL is locked.
    maxItems: 1

  adi,power-up-frequency-mhz:
    minimum: 1000
    maximum: 26500
    default: 10000
    description:
      The PLL tunes to this frequency during the initialization sequence.
      This property should be set to a frequency supported by the loop filter
      and VCO used in the design. Range is 1 GHz to 26.5 GHz for ADF41513,
      and 1 GHz to 10 GHz for ADF41510.

  adi,reference-div-factor:
    $ref: /schemas/types.yaml#/definitions/uint32
    minimum: 1
    maximum: 32
    default: 1
    description:
      Value for the reference division factor (R Counter). The driver will
      increment R Counter as needed to achieve a PFD frequency within the
      allowed range. High R counter values will reduce the PFD frequency, which
      lowers the frequency resolution, and affects phase noise performance.
      As it affects the PFD frequency, this value depends on the loop filter
      design.

  adi,reference-doubler-enable:
    description:
      Enables the reference doubler when deriving the PFD frequency.
      The maximum reference frequency when the doubler is enabled is 225 MHz.
      As it affects the PFD frequency, this value depends on the loop filter
      design.
    type: boolean

  adi,reference-div2-enable:
    description:
      Enables the reference divide-by-2 function when deriving the PFD
      frequency. As it affects the PFD frequency, this value depends on the
      loop filter design.
    type: boolean

  adi,charge-pump-resistor-ohms:
    minimum: 1800
    maximum: 10000
    default: 2700
    description:
      External charge pump resistor (R_SET) value in ohms. This sets the maximum
      charge pump current along with the charge pump current setting.

  adi,charge-pump-current-microamp:
    minimum: 81
    maximum: 7200
    description:
      Charge pump current (I_CP) in microamps. The value will be rounded to the
      nearest supported value. Range of acceptable values depends on the
      charge pump resistor value, such that 810 mV <= I_CP * R_SET <= 12960 mV.
      This value depends on the loop filter and the VCO design.

  adi,logic-level-1v8-enable:
    description:
      Set MUXOUT and DLD logic levels to 1.8V. Default is 3.3V.
    type: boolean

  adi,phase-detector-polarity-positive-enable:
    description:
      Set phase detector polarity to positive. Default is negative.
      Use positive polarity with non-inverting loop filter and VCO with
      positive tuning slope, or with inverting loop filter and VCO with
      negative tuning slope.
    type: boolean

  adi,lock-detector-count:
    $ref: /schemas/types.yaml#/definitions/uint32
    default: 64
    description:
      Sets the value for Lock Detector count of the PLL, which determines the
      number of consecutive phase detector cycles that must be within the lock
      detector window before lock is declared. Lower values increase the lock
      detection sensitivity, while higher values provides a more stable lock
      detection. Applications that consume the lock detect signal may require
      different settings based on system requirements.
    enum: [2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192]

  adi,phase-resync-period-ns:
    default: 0
    description:
      When this value is non-zero, enable phase resync functionality, which
      produces a consistent output phase offset with respect to the input
      reference. The value specifies the resync period in nanoseconds, used
      to configure clock dividers with respect to the PFD frequency. This value
      should be set to a value that is at least as long as the worst case lock
      time, i.e., it depends mostly on the loop filter design.

  adi,le-sync-enable:
    description:
      Synchronizes Load Enable (LE) transitions with the reference signal to
      avoid asynchronous glitches in the output. This is recommended when using
      the PLL as a frequency synthesizer, where the reference signal will always
      be present while the device is being configured. When using the PLL as a
      frequency tracker, where the reference signal may be absent, LE sync
      should be left disabled.
    type: boolean

dependencies:
  adi,charge-pump-resistor-ohms: [ 'adi,charge-pump-current-microamp' ]

required:
  - compatible
  - reg
  - clocks
  - avdd1-supply
  - avdd2-supply
  - avdd3-supply
  - avdd4-supply
  - avdd5-supply
  - vp-supply

allOf:
  - $ref: /schemas/spi/spi-peripheral-props.yaml#
  - if:
      properties:
        compatible:
          contains:
            const: adi,adf41510
    then:
      properties:
        adi,power-up-frequency-mhz:
          maximum: 10000

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/gpio/gpio.h>
    spi {
        #address-cells = <1>;
        #size-cells = <0>;

        pll@0 {
            compatible = "adi,adf41513";
            reg = <0>;
            spi-max-frequency = <25000000>;
            clocks = <&ref_clk>;
            avdd1-supply = <&avdd1_3v3>;
            avdd2-supply = <&avdd2_3v3>;
            avdd3-supply = <&avdd3_3v3>;
            avdd4-supply = <&avdd4_3v3>;
            avdd5-supply = <&avdd5_3v3>;
            vp-supply = <&vp_3v3>;
            enable-gpios = <&gpio0 10 GPIO_ACTIVE_HIGH>;
            lock-detect-gpios = <&gpio0 11 GPIO_ACTIVE_HIGH>;

            adi,power-up-frequency-mhz = <15500>;
            adi,charge-pump-current-microamp = <3600>;
            adi,charge-pump-resistor-ohms = <2700>;
            adi,reference-doubler-enable;
            adi,lock-detector-count = <64>;
            adi,phase-resync-period-ns = <0>;
            adi,phase-detector-polarity-positive-enable;
            adi,le-sync-enable;
        };
    };
...