linux-kernel - Re: [PATCH 3/4] dt-bindings: iio: dac: Add adi,ad3530r.yaml

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Message-ID: <20250319-opalescent-just-boa-fecdc0@krzk-bin>
Date: Wed, 19 Mar 2025 09:15:21 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Kim Seer Paller <kimseer.paller@...log.com>
Cc: Jonathan Cameron <jic23@...nel.org>, 
	Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org
Subject: Re: [PATCH 3/4] dt-bindings: iio: dac: Add adi,ad3530r.yaml

On Wed, Mar 19, 2025 at 11:47:57AM +0800, Kim Seer Paller wrote:
> The AD3530R/AD3530 is an 8-Channel, 16-Bit Voltage Output DAC, while the

"Document the AD3530R/AD3530, an 8-Channel, 16-bit...."

> AD3531R/AD3531 is a 4-Channel, 16-Bit Voltage Output DAC. These devices
> include software-programmable gain controls that provide full-scale
> output spans of 2.5V or 5V for reference voltages of 2.5V. They operate
> from a single supply voltage range of 2.7V to 5.5V and are guaranteed to
> be monotonic by design. Additionally, these devices features a 2.5V,
> 5ppm/°C internal reference, which is disabled by default.
> 
> This adds the documentation for ad3530r.

And that sentence us really not needed. See submitting patches.

> 
> Signed-off-by: Kim Seer Paller <kimseer.paller@...log.com>
> ---
>  .../devicetree/bindings/iio/dac/adi,ad3530r.yaml   | 89 ++++++++++++++++++++++
>  MAINTAINERS                                        |  1 +
>  2 files changed, 90 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad3530r.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ad3530r.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..6b50dce38383c8eb0d2107bf4e44cd320776f481
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/dac/adi,ad3530r.yaml
> @@ -0,0 +1,89 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/dac/adi,ad3530r.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD3530R and Similar DACs
> +
> +maintainers:
> +  - Kim Seer Paller <kimseer.paller@...log.com>
> +
> +description: |
> +  The AD3530R/AD3530 are low power, 8-channel, 16-bit, buffered voltage output,
> +  DACs that include a 2.5V internal reference (disabled by default), and a gain
> +  bit field, resulting in a full-scale output span of 2.5V (gain = 1) or 5V
> +  (gain = 2) for a reference voltage of 2.5V.
> +  Datasheet can be found here:
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/2664fa.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad3530r
> +      - adi,ad3531r
> +
> +  reg:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 50000000
> +
> +  vdd-supply:
> +    description: Power Supply Input.
> +
> +  iovdd-supply:
> +    description: Digital Power Supply Input.
> +
> +  ref-supply:
> +    description:
> +      Reference Input/Output. The voltage at the REF pin sets the full-scale
> +      range of all channels. If not provided the internal reference is used and
> +      also provided on the VREF pin.
> +
> +  reset-gpios:
> +    description:
> +      Active low signal that is falling edge sensitive. When it is deasserted,
> +      the digital core initialization is performed and all DAC registers except
> +      the Interface Configuration A register are reset to their default values.
> +    maxItems: 1
> +
> +  ldac-gpios:
> +    description:
> +      LDAC pin to be used as a hardware trigger to update the DAC channels. If
> +      not present, the DAC channels are updated by Software LDAC.
> +    maxItems: 1
> +
> +  adi,double-output-range:
> +    description:
> +      Configure the output range for all channels. If the property is present,
> +      the output will range from 0V to 2Vref. If the property is not
> +      present, the output will range from 0V to Vref.

You already have adi,range-double. It's not us who should find it, but
you. You have just ADI bindings to look at. We have all bindings.

Best regards,
Krzysztof