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Message-ID: <20250922220053.GA1371364-robh@kernel.org>
Date: Mon, 22 Sep 2025 17:00:53 -0500
From: Rob Herring <robh@...nel.org>
To: Ariana Lazar <ariana.lazar@...rochip.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
David Lechner <dlechner@...libre.com>,
Nuno Sá <nuno.sa@...log.com>,
Andy Shevchenko <andy@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: iio: dac: adding support for Microchip
MCP47FEB02
On Mon, Sep 22, 2025 at 02:30:53PM +0300, Ariana Lazar wrote:
> This is the device tree schema for iio driver for Microchip
> MCP47F(E/V)B(0/1/2)1, MCP47F(E/V)B(0/1/2)2, MCP47F(E/V)B(0/1/2)4 and
> MCP47F(E/V)B(0/1/2)8 series of buffered voltage output Digital-to-Analog
> Converters with nonvolatile or volatile memory and an I2C Interface.
>
> The families support up to 8 output channels.
>
> The devices can be 8-bit, 10-bit and 12-bit.
>
> Signed-off-by: Ariana Lazar <ariana.lazar@...rochip.com>
> ---
> .../bindings/iio/dac/microchip,mcp47feb02.yaml | 305 +++++++++++++++++++++
> MAINTAINERS | 6 +
> 2 files changed, 311 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/iio/dac/microchip,mcp47feb02.yaml b/Documentation/devicetree/bindings/iio/dac/microchip,mcp47feb02.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..d05ddafa37540bc1f6b6ce65a466b95913925c10
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/dac/microchip,mcp47feb02.yaml
> @@ -0,0 +1,305 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/dac/microchip,mcp47feb02.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip MCP47F(E/V)B(0/1/2)(1/2/4/8) DAC with I2C Interface Families
> +
> +maintainers:
> + - Ariana Lazar <ariana.lazar@...rochip.com>
> +
> +description: |
> + Datasheet for MCP47FEB01, MCP47FEB11, MCP47FEB21, MCP47FEB02, MCP47FEB12,
> + MCP47FEB22 can be found here:
> + https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005375A.pdf
> + Datasheet for MCP47FVBXX can be found here:
> + https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005405A.pdf
> + Datasheet for MCP47FEB04, MCP47FEB14, MCP47FEB24, MCP47FEB08, MCP47FEB18,
> + MCP47FEB28, MCP47FVB04, MCP47FVB14, MCP47FVB24, MCP47FVB08, MCP47FVB18,
> + MCP47FVB28 can be found here:
> + https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/MCP47FXBX48-Data-Sheet-DS200006368A.pdf
> +
> + +------------+--------------+-------------+-------------+------------+
> + | Device | Resolution | Channels | Vref number | Memory |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP47FEB01 | 8-bit | 1 | 1 | EEPROM |
> + | MCP47FEB11 | 10-bit | 1 | 1 | EEPROM |
> + | MCP47FEB21 | 12-bit | 1 | 1 | EEPROM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP47FEB02 | 8-bit | 2 | 1 | EEPROM |
> + | MCP47FEB12 | 10-bit | 2 | 1 | EEPROM |
> + | MCP47FEB22 | 12-bit | 2 | 1 | EEPROM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP47FVB01 | 8-bit | 1 | 1 | RAM |
> + | MCP47FVB11 | 10-bit | 1 | 1 | RAM |
> + | MCP47FVB21 | 12-bit | 1 | 1 | RAM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP47FVB02 | 8-bit | 2 | 1 | RAM |
> + | MCP47FVB12 | 10-bit | 2 | 1 | RAM |
> + | MCP47FVB22 | 12-bit | 2 | 1 | RAM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP47FVB04 | 8-bit | 4 | 2 | RAM |
> + | MCP47FVB14 | 10-bit | 4 | 2 | RAM |
> + | MCP47FVB24 | 12-bit | 4 | 2 | RAM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP47FVB08 | 8-bit | 8 | 2 | RAM |
> + | MCP47FVB18 | 10-bit | 8 | 2 | RAM |
> + | MCP47FVB28 | 12-bit | 8 | 2 | RAM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP47FEB04 | 8-bit | 4 | 2 | EEPROM |
> + | MCP47FEB14 | 10-bit | 4 | 2 | EEPROM |
> + | MCP47FEB24 | 12-bit | 4 | 2 | EEPROM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP47FEB08 | 8-bit | 8 | 2 | EEPROM |
> + | MCP47FEB18 | 10-bit | 8 | 2 | EEPROM |
> + | MCP47FEB28 | 12-bit | 8 | 2 | EEPROM |
> + +------------+--------------+-------------+-------------+------------+
> +
> +properties:
> + compatible:
> + enum:
> + - microchip,mcp47feb01
> + - microchip,mcp47feb11
> + - microchip,mcp47feb21
> + - microchip,mcp47feb02
> + - microchip,mcp47feb12
> + - microchip,mcp47feb22
> + - microchip,mcp47fvb01
> + - microchip,mcp47fvb11
> + - microchip,mcp47fvb21
> + - microchip,mcp47fvb02
> + - microchip,mcp47fvb12
> + - microchip,mcp47fvb22
> + - microchip,mcp47fvb04
> + - microchip,mcp47fvb14
> + - microchip,mcp47fvb24
> + - microchip,mcp47fvb08
> + - microchip,mcp47fvb18
> + - microchip,mcp47fvb28
> + - microchip,mcp47feb04
> + - microchip,mcp47feb14
> + - microchip,mcp47feb24
> + - microchip,mcp47feb08
> + - microchip,mcp47feb18
> + - microchip,mcp47feb28
> +
> + reg:
> + maxItems: 1
> +
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 0
> +
> + vdd-supply:
> + description: |
Don't need '|' if no formatting to preserve.
> + Provides power and it will be used as the reference voltage if vref-supply
> + is not provided.
> +
> + vref-supply:
> + description: |
> + Vref pin is used as a voltage reference when this supply is specified.
> + Into the datasheet it could be found as a Vref0.
> + If it does not exists the internal reference will be used.
blank line between paragraphs. But is every sentence a paragraph?
> + This will be used as a reference voltage for the following outputs:
> + - for single-channel device: Vout0;
> + - for dual-channel device: Vout0, Vout1;
> + - for quad-channel device: Vout0, Vout2;
> + - for octal-channel device: Vout0, Vout2, Vout6, Vout8;
> +
> + vref1-supply:
> + description: |
> + Vref1 pin is used as a voltage reference when this supply is specified.
> + If it does not exists the internal reference will be used.
> + This will be used as a reference voltage for the following outputs:
> + - for quad-channel device: Vout1, Vout3;
> + - for octal-channel device: Vout1, Vout3, Vout5, Vout7;
> +
> + lat-gpios:
> + description: |
> + LAT pin to be used as a hardware trigger to synchronously update the DAC
> + channels and the pin is active Low. It could be also found as lat0 in
> + datasheet.
> + maxItems: 1
> +
> + lat1-gpios:
> + description: |
> + LAT1 pin to be used as a hardware trigger to synchronously update the odd
> + DAC channels on devices with 4 and 8 channels. The pin is active Low.
> + maxItems: 1
> +
> + microchip,vref-buffered:
> + type: boolean
> + description: |
> + Enable buffering of the external Vref/Vref0 pin in cases where the
> + external reference voltage does not have sufficient current capability in
> + order not to drop it’s voltage when connected to the internal resistor
> + ladder circuit.
> +
> + microchip,vref1-buffered:
> + type: boolean
> + description: |
> + Enable buffering of the external Vref1 pin in cases where the external
> + reference voltage does not have sufficient current capability in order not
> + to drop it’s voltage when connected to the internal resistor ladder
> + circuit.
> +
> + microchip,output-gain-2x:
> + type: boolean
> + description: |
?
> +
> +patternProperties:
> + "^channel@[0-7]$":
> + $ref: dac.yaml
> + type: object
> + description: Voltage output channel.
> +
> + properties:
> + reg:
> + description: The channel number.
> + minimum: 1
> + maximum: 7
> +
> + label:
> + description: Unique name to identify which channel this is.
> +
> + required:
> + - reg
> +
> + unevaluatedProperties: false
> +
> +required:
> + - compatible
> + - reg
> + - vdd-supply
> +
> +allOf:
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - microchip,mcp47feb01
> + - microchip,mcp47feb11
> + - microchip,mcp47feb21
> + - microchip,mcp47fvb01
> + - microchip,mcp47fvb11
> + - microchip,mcp47fvb21
> + then:
> + properties:
> + lat-gpios: true
true has no effect as the property is already allowed. Drop all the true
cases.
> + lat1-gpios: false
> + vref-supply: true
> + vref1-supply: false
> + microchip,vref-buffered: true
> + microchip,vref1-buffered: false
> + patternProperties:
> + "^channel@[1]$":
Did you mean "[01]"? If not, that's not a pattern, but a fixed string.
> + properties:
> + reg:
> + items:
> + maximum: 1
> + "^channel@[2-7]$": false
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - microchip,mcp47feb02
> + - microchip,mcp47feb12
> + - microchip,mcp47feb22
> + - microchip,mcp47fvb02
> + - microchip,mcp47fvb12
> + - microchip,mcp47fvb22
> + then:
> + properties:
> + lat-gpios: true
> + lat1-gpios: false
> + vref-supply: true
> + vref1-supply: false
> + microchip,vref-buffered: true
> + microchip,vref1-buffered: false
> + patternProperties:
> + "^channel@[1-2]$":
> + properties:
> + reg:
> + items:
> + maximum: 1
Based on the unit-address, the minimum is 1 and the maximum is 2.
"enum: [ 1, 2 ]" is a bit more concise.
> + "^channel@[3-7]$": false
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - microchip,mcp47fvb04
> + - microchip,mcp47fvb14
> + - microchip,mcp47fvb24
> + - microchip,mcp47fvb08
> + - microchip,mcp47fvb18
> + - microchip,mcp47fvb28
> + - microchip,mcp47feb04
> + - microchip,mcp47feb14
> + - microchip,mcp47feb24
> + - microchip,mcp47feb08
> + - microchip,mcp47feb18
> + - microchip,mcp47feb28
> + then:
> + properties:
> + lat-gpios: true
> + lat1-gpios: true
> + vref-supply: true
> + vref1-supply: true
> + microchip,vref-buffered: true
> + microchip,vref1-buffered: true
> + patternProperties:
> + "^channel@[1-4]$":
> + properties:
> + reg:
> + items:
> + maximum: 1
?
> + "^channel@[5-7]$": false
> + - if:
> + not:
> + required:
> + - vref-supply
> + then:
> + properties:
> + microchip,vref-buffered: false
> + - if:
> + not:
> + required:
> + - vref1-supply
> + then:
> + properties:
> + microchip,vref1-buffered: false
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + i2c {
> +
> + #address-cells = <1>;
> + #size-cells = <0>;
> + dac@0 {
> + compatible = "microchip,mcp47feb02";
> + reg = <0>;
> + vdd-supply = <&vdac_vdd>;
> + vref-supply = <&vref_reg>;
> +
> + #address-cells = <1>;
> + #size-cells = <0>;
> + channel@0 {
> + reg = <0>;
> + label = "DAC_OUTPUT_0";
> + };
> +
> + channel@1 {
> + reg = <0x1>;
> + label = "DAC_OUTPUT_1";
> + };
> + };
> + };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index a92290fffa163f9fe8fe3f04bf66426f9a894409..6f51890cfc3081bc49c08fddc8af526c1ecc8d72 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14938,6 +14938,12 @@ F: Documentation/ABI/testing/sysfs-bus-iio-potentiometer-mcp4531
> F: drivers/iio/potentiometer/mcp4018.c
> F: drivers/iio/potentiometer/mcp4531.c
>
> +MCP47FEB02 MICROCHIP DAC DRIVER
> +M: Ariana Lazar <ariana.lazar@...rochip.com>
> +L: linux-iio@...r.kernel.org
> +S: Supported
> +F: Documentation/devicetree/bindings/iio/dac/microchip,mcp47feb02.yaml
> +
> MCP4821 DAC DRIVER
> M: Anshul Dalal <anshulusr@...il.com>
> L: linux-iio@...r.kernel.org
>
> --
> 2.43.0
>
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