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Date: Sat, 4 Dec 2021 17:52:13 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Mihail Chindris <mihail.chindris@...log.com>
Cc: <linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>,
<robh+dt@...nel.org>, <broonie@...nel.org>, <lars@...afoo.de>,
<Michael.Hennerich@...log.com>, <nuno.sa@...log.com>,
<dragos.bogdan@...log.com>, <alexandru.ardelean@...log.com>
Subject: Re: [PATCH v6 1/2] dt-bindings: iio: dac: Add adi,ad3552r.yaml
On Mon, 29 Nov 2021 15:22:53 +0000
Mihail Chindris <mihail.chindris@...log.com> wrote:
> Add documentation for ad3552r
>
> Signed-off-by: Mihail Chindris <mihail.chindris@...log.com>
This one is complex, so definitely looking for a device tree binding review
from Rob. Unfortunately this hasn't gone to him so we are unlikely to get one!
All series with a dt-binding in them should be sent to the list and Rob as
per the entry in MAINTAINERS
OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS
M: Rob Herring <robh+dt@...nel.org>
L: devicetree@...r.kernel.org
S: Maintained
Q: http://patchwork.ozlabs.org/project/devicetree-bindings/list/
T: git git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git
F: Documentation/devicetree/
F: arch/*/boot/dts/
F: include/dt-bindings/
I'd missed this previously but was wondering why Rob hadn't given feedback on this
as he caught up with a lot of outstanding reviews earlier this week.
If there is nothing else, please send out again with those addresses added.
That way it will get into the patchwork instance and you can see the progress.
https://patchwork.ozlabs.org/project/devicetree-bindings/list/
Jonathan
> ---
> .../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
> +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
> + properties:
> + reg:
> + description: Channel number
> + enum: [0, 1]
> +
> + custom-output-range-config:
> + type: object
> + 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]
> + properties:
> + adi,gain-offset:
> + description: Gain offset used in the above formula
> + $ref: /schemas/types.yaml#/definitions/int32
> + maximum: 511
> + minimum: -511
> + 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>;
> + };
> + };
> + };
> +...
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