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Date: Mon, 6 Dec 2021 15:41:25 -0600
From: Rob Herring <robh@...nel.org>
To: Mihail Chindris <mihail.chindris@...log.com>
Cc: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
broonie@...nel.org, devicetree@...r.kernel.org, lars@...afoo.de,
Michael.Hennerich@...log.com, jic23@...nel.org, nuno.sa@...log.com,
dragos.bogdan@...log.com, alexandru.ardelean@...log.com
Subject: Re: [RESEND, PATCH v6 1/2] dt-bindings: iio: dac: Add
adi,ad3552r.yaml
On Mon, Dec 06, 2021 at 04:35:29PM +0000, Mihail Chindris wrote:
> Add documentation for ad3552r
>
> Signed-off-by: Mihail Chindris <mihail.chindris@...log.com>
> ---
> .../bindings/iio/dac/adi,ad3552r.yaml | 190 ++++++++++++++++++
> 1 file changed, 190 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml
>
> diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml
> new file mode 100644
> index 000000000000..c6999bb4c7a4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml
> @@ -0,0 +1,190 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2020 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/dac/adi,ad3552r.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD2552R DAC device driver
> +
> +maintainers:
> + - Mihail Chindris <mihail.chindris@...log.com>
> +
> +description: |
> + Bindings for the Analog Devices AD3552R DAC device and similar.
> + Datasheet can be found here:
> + https://www.analog.com/media/en/technical-documentation/data-sheets/ad3542r.pdf
> + https://www.analog.com/media/en/technical-documentation/data-sheets/ad3552r.pdf
blank line
> +properties:
> + compatible:
> + enum:
> + - adi,ad3542r
> + - adi,ad3552r
> +
> + reg:
> + maxItems: 1
> +
> + spi-max-frequency:
> + maximum: 30000000
> +
> + reset-gpios:
> + maxItems: 1
> +
> + ldac-gpios:
> + description: |
> + LDAC pin to be used as a hardware trigger to update the DAC channels.
> + maxItems: 1
> +
> + vref-supply:
> + description:
> + The regulator to use as an external reference. If it does not exists the
> + internal reference will be used. External reference must be 2.5V
> +
> + adi,vref-out-en:
> + description: Vref I/O driven by internal vref to 2.5V. If not set, Vref pin
> + will be floating.
> + type: boolean
> +
> + adi,sdo-drive-strength:
> + description: |
> + Configure SDIO0 and SDIO1 strength levels:
> + - 0: low SDO drive strength.
> + - 1: medium low SDO drive strength.
> + - 2: medium high SDO drive strength.
> + - 3: high SDO drive strength
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [0, 1, 2, 3]
> +
> +patternProperties:
> + "^channel@([0-1])$":
> + type: object
> + description: Configurations of the DAC Channels
additionalProperties: false
> + properties:
> + reg:
> + description: Channel number
> + enum: [0, 1]
With that, you will need:
adi,output-range-microvolt: true
> +
> + custom-output-range-config:
> + type: object
Why does this need to be in a child node?
> + description: Configuration of custom range when
> + adi,output-range-microvolt is not present.
> + The formulas for calculation the output voltages are
> + Vout_fs = 2.5 + [(GainN + Offset/1024) * 2.5 * Rfbx * 1.03]
> + Vout_zs = 2.5 - [(GainP + Offset/1024) * 2.5 * Rfbx * 1.03]
blank line
> + properties:
> + adi,gain-offset:
> + description: Gain offset used in the above formula
> + $ref: /schemas/types.yaml#/definitions/int32
> + maximum: 511
> + minimum: -511
blank line, and so on...
> + adi,gain-scaling-p-inv-log2:
> + description: GainP = 1 / ( 2 ^ adi,gain-scaling-p-inv-log2)
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [0, 1, 2, 3]
> + adi,gain-scaling-n-inv-log2:
> + description: GainN = 1 / ( 2 ^ adi,gain-scaling-n-inv-log2)
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [0, 1, 2, 3]
> + adi,rfb-ohms:
> + description: Feedback Resistor
> + required:
> + - adi,gain-offset
> + - adi,gain-scaling-p-inv-log2
> + - adi,gain-scaling-n-inv-log2
> + - adi,rfb-ohms
> + required:
> + - reg
> +
> + oneOf:
> + # If adi,output-range-microvolt is missing,
> + # custom-output-range-config must be used
> + - required:
> + - adi,output-range-microvolt
> + - required:
> + - custom-output-range-config
> +
> +allOf:
> + - if:
> + properties:
> + compatible:
> + contains:
> + const: adi,ad3542r
> + then:
> + patternProperties:
> + "^channel@([0-1])$":
> + type: object
> + properties:
> + adi,output-range-microvolt:
> + description: |
> + Voltage output range of the channel as <minimum, maximum>
> + Required connections:
> + Rfb1x for: 0 to 2.5 V; 0 to 3V; 0 to 5 V;
> + Rfb2x for: 0 to 10 V; 2.5 to 7.5V; -5 to 5 V;
> + oneOf:
> + - items:
> + - const: 0
> + - enum: [2500000, 3000000, 5000000, 10000000]
> + - items:
> + - const: -2500000
> + - const: 7500000
> + - items:
> + - const: -5000000
> + - const: 5000000
> + required:
> + - adi,output-range-microvolt
> + - if:
> + properties:
> + compatible:
> + contains:
> + const: adi,ad3552r
> + then:
> + patternProperties:
> + "^channel@([0-1])$":
> + type: object
> + properties:
> + adi,output-range-microvolt:
> + description: |
> + Voltage output range of the channel as <minimum, maximum>
> + Required connections:
> + Rfb1x for: 0 to 2.5 V; 0 to 5 V;
> + Rfb2x for: 0 to 10 V; -5 to 5 V;
> + Rfb4x for: -10 to 10V
> + oneOf:
> + - items:
> + - const: 0
> + - enum: [2500000, 5000000, 10000000]
> + - items:
> + - const: -5000000
> + - const: 5000000
> + - items:
> + - const: -10000000
> + - const: 10000000
> +
> +required:
> + - compatible
> + - reg
> + - spi-max-frequency
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + ad3552r {
> + compatible = "adi,ad3552r";
> + reg = <0>;
> + spi-max-frequency = <20000000>;
> + channel@0 {
> + reg = <0>;
> + adi,output-range-microvolt = <0 10000000>;
> + };
> + channel@1 {
> + reg = <1>;
> + custom-output-range-config {
> + adi,gain-offset = <5>;
> + adi,gain-scaling-p-inv-log2 = <1>;
> + adi,gain-scaling-n-inv-log2 = <2>;
> + adi,rfb-ohms = <1>;
> + };
> + };
> + };
> +...
> --
> 2.27.0
>
>
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