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Date: Thu, 9 Jun 2022 15:03:42 -0600
From: Rob Herring <robh@...nel.org>
To: Cosmin Tanislav <demonsingur@...il.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
linux-iio@...r.kernel.org, linux-gpio@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Cosmin Tanislav <cosmin.tanislav@...log.com>
Subject: Re: [PATCH v4 1/2] dt-bindings: iio: adc: add AD4130
On Wed, Jun 08, 2022 at 12:12:37PM +0300, Cosmin Tanislav wrote:
> AD4130-8 is an ultra-low power, high precision, measurement solution for
> low bandwidth battery operated applications.
>
> The fully integrated AFE (Analog Front-End) includes a multiplexer for up
> to 16 single-ended or 8 differential inputs, PGA (Programmable Gain
> Amplifier), 24-bit Sigma-Delta ADC, on-chip reference and oscillator,
> selectable filter options, smart sequencer, sensor biasing and excitation
> options, diagnostics, and a FIFO buffer.
>
> Signed-off-by: Cosmin Tanislav <cosmin.tanislav@...log.com>
> ---
> .../bindings/iio/adc/adi,ad4130.yaml | 262 ++++++++++++++++++
> 1 file changed, 262 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad4130.yaml
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4130.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4130.yaml
> new file mode 100644
> index 000000000000..c06b8a96d31e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4130.yaml
> @@ -0,0 +1,262 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2022 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/adi,ad4130.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD4130 ADC device driver
> +
> +maintainers:
> + - Cosmin Tanislav <cosmin.tanislav@...log.com>
> +
> +description: |
> + Bindings for the Analog Devices AD4130 ADC. Datasheet can be found here:
> + https://www.analog.com/media/en/technical-documentation/data-sheets/AD4130-8.pdf
> +
> +properties:
> + compatible:
> + enum:
> + - adi,ad4130
> +
> + reg:
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> + description: phandle to the master clock (mclk)
> +
> + clock-names:
> + items:
> + - const: mclk
> +
> + interrupts:
> + maxItems: 1
> +
> + interrupt-names:
> + description: |
> + Specify which interrupt pin should be configured as Data Ready / FIFO
> + interrupt.
> + Default if not supplied is int.
default: int
> + enum:
> + - int
> + - clk
> + - p2
> + - dout
> +
> + '#address-cells':
> + const: 1
> +
> + '#size-cells':
> + const: 0
> +
> + refin1-supply:
> + description: refin1 supply. Can be used as reference for conversion.
> +
> + refin2-supply:
> + description: refin2 supply. Can be used as reference for conversion.
> +
> + avdd-supply:
> + description: AVDD voltage supply. Can be used as reference for conversion.
> +
> + iovdd-supply:
> + description: IOVDD voltage supply. Used for the chip interface.
> +
> + spi-max-frequency:
> + maximum: 5000000
> +
> + adi,int-clk-out:
> + description: Specify if the internal clock should be exposed on the CLK pin.
> + type: boolean
> +
> + adi,ext-clk-freq:
> + description: Specify the frequency of the external clock.
> + $ref: /schemas/types.yaml#/definitions/uint32
-hz suffix and drop the type.
> + enum: [76800, 153600]
> + default: 76800
> +
> + adi,bipolar:
> + description: Specify if the device should be used in bipolar mode.
> + type: boolean
> +
> + adi,vbias-pins:
> + description: Analog inputs to apply a voltage bias of (AVDD − AVSS) / 2 to.
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + maxItems: 16
> + items:
> + minimum: 0
> + maximum: 15
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> +
> +patternProperties:
> + "^channel@([0-9]|1[0-5])$":
> + type: object
> + $ref: adc.yaml
> + unevaluatedProperties: false
> +
> + properties:
> + reg:
> + description: |
Don't need '|'.
> + The channel number.
> + items:
> + minimum: 0
> + maximum: 15
This allows for more than 1 channel to be listed in reg. Is that intent?
If not, drop 'items'. If so and there a valid range, then add
minItems/maxItems.
> +
> + diff-channels:
> + description: |
> + Besides the analog inputs available, internal inputs can be used.
> + 16: Internal temperature sensor.
> + 17: AVSS
> + 18: Internal reference
> + 19: DGND
> + 20: (AVDD − AVSS)/6+
> + 21: (AVDD − AVSS)/6-
> + 22: (IOVDD − DGND)/6+
> + 23: (IOVDD − DGND)/6-
> + 24: (ALDO − AVSS)/6+
> + 25: (ALDO − AVSS)/6-
> + 26: (DLDO − DGND)/6+
> + 27: (DLDO − DGND)/6-
> + 28: V_MV_P
> + 29: V_MV_M
> + items:
> + minimum: 0
> + maximum: 29
> +
> + adi,reference-select:
> + description: |
> + Select the reference source to use when converting on the
> + specific channel. Valid values are:
> + 0: REFIN1(+)/REFIN1(−)
> + 1: REFIN2(+)/REFIN2(−)
> + 2: REFOUT/AVSS (Internal reference)
> + 3: AVDD/AVSS
> + If not specified, REFIN1 is used.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [0, 1, 2, 3]
> + default: 0
> +
> + adi,excitation-pin-0:
> + description: |
> + Analog input to apply excitation current to while the channel
> + is active.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0
> + maximum: 15
> + default: 0
> +
> + adi,excitation-pin-1:
> + description: |
> + Analog input to apply excitation current to while this channel
> + is active.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0
> + maximum: 15
> + default: 0
> +
> + adi,excitation-current-0-nanoamps:
Prior property was 'adi,excitation-current-nanoamp'. Please match
'-nanoamp'.
> + description: |
> + Excitation current in nanoamps to be applied to pin specified in
> + adi,excitation-pin-0 while this channel is active.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [0, 100, 10000, 20000, 50000, 100000, 150000, 200000]
> + default: 0
> +
> + adi,excitation-current-1-nanoamps:
> + description: |
> + Excitation current in nanoamps to be applied to pin specified in
> + adi,excitation-pin-1 while this channel is active.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [0, 100, 10000, 20000, 50000, 100000, 150000, 200000]
> + default: 0
> +
> + adi,burnout-current-nanoamps:
> + description: |
> + Burnout current in nanoamps to be applied for this channel.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [0, 500, 2000, 4000]
> + default: 0
> +
> + adi,buffered-positive:
> + description: Enable buffered mode for positive input.
> + type: boolean
> +
> + adi,buffered-negative:
> + description: Enable buffered mode for negative input.
> + type: boolean
> +
> + required:
> + - reg
> + - diff-channels
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/irq.h>
> +
> + spi {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + adc@0 {
> + compatible = "adi,ad4130";
> + reg = <0>;
> +
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + spi-max-frequency = <5000000>;
> + interrupts = <27 IRQ_TYPE_EDGE_FALLING>;
> + interrupt-parent = <&gpio>;
> +
> + channel@0 {
> + reg = <0>;
> +
> + adi,reference-select = <2>;
> +
> + /* AIN8, AIN9 */
> + diff-channels = <8 9>;
> + };
> +
> + channel@1 {
> + reg = <1>;
> +
> + adi,reference-select = <2>;
> +
> + /* AIN10, AIN11 */
> + diff-channels = <10 11>;
> + };
> +
> + channel@2 {
> + reg = <2>;
> +
> + adi,reference-select = <2>;
> +
> + /* Temperature Sensor, DGND */
> + diff-channels = <16 19>;
> + };
> +
> + channel@3 {
> + reg = <3>;
> +
> + adi,reference-select = <2>;
> +
> + /* Internal reference, DGND */
> + diff-channels = <18 19>;
> + };
> +
> + channel@4 {
> + reg = <4>;
> +
> + adi,reference-select = <2>;
> +
> + /* DGND, DGND */
> + diff-channels = <19 19>;
> + };
> + };
> + };
> --
> 2.36.1
>
>
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