Re: [PATCH RFC v2 1/9] dt-bindings: iio: frequency: add ad9910

[Conor Dooley]

On Wed, Mar 18, 2026 at 05:56:01PM +0000, Rodrigo Alencar via B4 Relay wrote:
> From: Rodrigo Alencar <rodrigo.alencar@xxxxxxxxxx>
> 
> DT-bindings for AD9910, a 1 GSPS DDS with 14-bit DAC. It includes
> configurations for clocks, DAC current, reset and basic GPIO control.
> 
> Signed-off-by: Rodrigo Alencar <rodrigo.alencar@xxxxxxxxxx>
> ---
>  .../bindings/iio/frequency/adi,ad9910.yaml         | 189 +++++++++++++++++++++
>  MAINTAINERS                                        |   7 +
>  2 files changed, 196 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/frequency/adi,ad9910.yaml b/Documentation/devicetree/bindings/iio/frequency/adi,ad9910.yaml
> new file mode 100644
> index 000000000000..68eaefea3f5a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/frequency/adi,ad9910.yaml
> @@ -0,0 +1,189 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/frequency/adi,ad9910.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD9910 Direct Digital Synthesizer
> +
> +maintainers:
> +  - Rodrigo Alencar <rodrigo.alencar@xxxxxxxxxx>
> +
> +description:
> +  The AD9910 is a 1 GSPS direct digital synthesizer (DDS) with an integrated
> +  14-bit DAC. It features single tone mode with 8 configurable profiles,
> +  a digital ramp generator, RAM control, OSK, and a parallel data port for
> +  high-speed streaming.
> +
> +  https://www.analog.com/en/products/ad9910.html
> +
> +properties:
> +  compatible:
> +    const: adi,ad9910
> +
> +  reg:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 70000000
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 2
> +    description:
> +      First clock is always the reference clock (REF_CLK), while the second
> +      clock is an optional synchronization clock (SYNC_IN).

This should be an items list, like:
items:
  - description: foo
  - description: bar

> +
> +  clock-names:
> +    oneOf:
> +      - items:
> +          - const: ref_clk

s/_clk//, not like it can be anything else!

> +      - items:
> +          - const: ref_clk
> +          - const: sync_in
> +
> +  '#clock-cells':
> +    const: 1
> +
> +  clock-output-names:
> +    minItems: 1
> +    maxItems: 3
> +    items:
> +      enum: [ sync_clk, pdclk, sync_out ]

I'd say same here, but then you've got some issues with differentiation,
so idk.

> +
> +  interrupts:
> +    minItems: 1
> +    maxItems: 2

Items list here please, the -names property shouldn't be the only place
one can figure out what goes where.

> +
> +  interrupt-names:
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      enum: [ drover, ram_swp_ovr ]
> +
> +  dvdd-io33-supply:
> +    description: 3.3V Digital I/O supply.
> +
> +  avdd33-supply:
> +    description: 3.3V Analog DAC supply.
> +
> +  dvdd18-supply:
> +    description: 1.8V Digital Core supply.
> +
> +  avdd18-supply:
> +    description: 1.8V Analog Core supply.
> +
> +  reset-gpios:
> +    description:
> +      GPIOs controlling the Main Device reset.
> +
> +  io-reset-gpios:
> +    maxItems: 1
> +    description:
> +      GPIO controlling the I/O_RESET pin.
> +
> +  powerdown-gpios:
> +    maxItems: 1
> +    description:
> +      GPIO controlling the EXT_PWR_DWN pin.
> +
> +  update-gpios:
> +    maxItems: 1
> +    description:
> +      GPIO controlling the I/O_UPDATE pin.
> +
> +  profile-gpios:
> +    minItems: 3
> +    maxItems: 3
> +    description:
> +      GPIOs controlling the PROFILE[2:0] pins for profile selection.
> +
> +  sync-err-gpios:
> +    maxItems: 1
> +    description:
> +      GPIO used to read SYNC_SMP_ERR pin status.
> +
> +  adi,pll-enable:
> +    type: boolean
> +    description:
> +      Indicates that a loop filter is connected and the internal PLL is enabled.
> +      Often used when the reference clock is provided by a crystal or by a
> +      single-ended on-board oscillator.
> +
> +  adi,charge-pump-current-microamp:
> +    minimum: 212
> +    maximum: 387
> +    default: 387
> +    description:
> +      PLL charge pump current in microamps. Only applicable when the internal
> +      PLL is enabled. The value is rounded to the nearest supported step. This
> +      value depends mostly on the loop filter design.
> +
> +  adi,refclk-out-drive-strength:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    enum: [ disabled, low, medium, high ]
> +    default: disabled
> +    description:
> +      Reference clock output (DRV0) drive strength. Only applicable when
> +      the internal PLL is enabled.
> +
> +  adi,dac-output-current-microamp:
> +    minimum: 8640
> +    maximum: 31590
> +    default: 20070
> +    description:
> +      DAC full-scale output current in microamps.
> +
> +dependencies:
> +  adi,charge-pump-current-microamp: [ 'adi,pll-enable' ]
> +  adi,refclk-out-drive-strength: [ 'adi,pll-enable' ]
> +  interrupts: [ interrupt-names ]
> +  clocks: [ clock-names ]
> +  '#clock-cells': [ clock-output-names ]
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks

Worth pointing out, you haven't made either clock-names or
interrupt-names (when interrupts are used) mandatory, so the properties
cannot be used by a driver. I suggest you make clock-names mandatory and
interrupts depend on interrupt-names.

pw-bot: changes-requested

Cheers,
Conor.

> +  - dvdd-io33-supply
> +  - avdd33-supply
> +  - dvdd18-supply
> +  - avdd18-supply
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        dds@0 {
> +            compatible = "adi,ad9910";
> +            reg = <0>;
> +            spi-max-frequency = <1000000>;
> +            clocks = <&ad9910_refclk>;
> +            clock-names = "ref_clk";
> +
> +            dvdd-io33-supply = <&vdd_io33>;
> +            avdd33-supply = <&vdd_a33>;
> +            dvdd18-supply = <&vdd_d18>;
> +            avdd18-supply = <&vdd_a18>;
> +
> +            reset-gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
> +            io-reset-gpios = <&gpio 1 GPIO_ACTIVE_HIGH>;
> +            powerdown-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
> +            update-gpios = <&gpio 3 GPIO_ACTIVE_HIGH>;
> +            profile-gpios = <&gpio 4 GPIO_ACTIVE_HIGH>,
> +                            <&gpio 5 GPIO_ACTIVE_HIGH>,
> +                            <&gpio 6 GPIO_ACTIVE_HIGH>;
> +
> +            adi,pll-enable;
> +            adi,charge-pump-current-microamp = <387>;
> +            adi,refclk-out-drive-strength = "disabled";
> +        };
> +    };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 08d8ddf4ef68..2ca8b68e5daa 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1630,6 +1630,13 @@ W:	https://ez.analog.com/linux-software-drivers
>  F:	Documentation/devicetree/bindings/iio/dac/adi,ad9739a.yaml
>  F:	drivers/iio/dac/ad9739a.c
>  
> +ANALOG DEVICES INC AD9910 DRIVER
> +M:	Rodrigo Alencar <rodrigo.alencar@xxxxxxxxxx>
> +L:	linux-iio@xxxxxxxxxxxxxxx
> +S:	Supported
> +W:	https://ez.analog.com/linux-software-drivers
> +F:	Documentation/devicetree/bindings/iio/frequency/adi,ad9910.yaml
> +
>  ANALOG DEVICES INC MAX22007 DRIVER
>  M:	Janani Sunil <janani.sunil@xxxxxxxxxx>
>  L:	linux-iio@xxxxxxxxxxxxxxx
> 
> -- 
> 2.43.0
> 
>

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