Re: [PATCH 1/2] dt-bindings: iio: dac: add support for Microchip MCP48FEB02

Conor Dooley
2026-02-12T18:00:11Z

[-- Attachment #1: Type: text/plain, Size: 13024 bytes --]

On Thu, Feb 12, 2026 at 02:48:34PM +0200, Ariana Lazar wrote:
> This is the device tree schema for iio driver for Microchip
> MCP48FxBy1/2/4/8 series of buffered voltage output Digital-to-Analog
> Converters with nonvolatile or volatile memory and an SPI 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@microchip.com>

Other than the interface, what's actually different between this and the
47? Could they share the same binding?

Cheers,
Conor.

> ---
> .../bindings/iio/dac/microchip,mcp48feb02.yaml | 299 +++++++++++++++++++++
> MAINTAINERS | 6 +
> 2 files changed, 305 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/iio/dac/microchip,mcp48feb02.yaml b/Documentation/devicetree/bindings/iio/dac/microchip,mcp48feb02.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..78c6bd641c6e37321e4fc056db83eb4277f429b8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/dac/microchip,mcp48feb02.yaml
> @@ -0,0 +1,299 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/dac/microchip,mcp48feb02.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip MCP48F(E/V)B(0/1/2)(1/2/4/8) DAC with SPI Interface Families
> +
> +maintainers:
> + - Ariana Lazar <ariana.lazar@microchip.com>
> +
> +description: |
> + Datasheet for MCP48FEB01, MCP48FEB02, MCP48FEB11, MCP48FEB12, MCP48FEB21,
> + MCP48FEB22 can be found here:
> + https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005429B.pdf
> + Datasheet for MCP48FVB01, MCP48FVB02, MCP48FVB11, MCP48FVB12, MCP48FVB21,
> + MCP48FVB22 can be found here:
> + https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/20005466A.pdf
> + Datasheet for MCP48FEB04, MCP48FEB14, MCP48FEB24, MCP48FEB08, MCP48FEB18,
> + MCP48FEB28, MCP48FVB04, MCP48FVB14, MCP48FVB24, MCP48FVB08, MCP48FVB18,
> + MCP48FVB28 can be found here:
> + https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/MCP48FXBX4-8-Family-Data-Sheet-DS20006362A.pdf
> +
> + +------------+--------------+-------------+-------------+------------+
> + | Device | Resolution | Channels | Vref number | Memory |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP48FEB01 | | 1 | 1 | EEPROM |
> + | MCP48FEB02 | 8-bit | 2 | 1 | EEPROM |
> + | MCP48FEB04 | | 4 | 2 | EEPROM |
> + | MCP48FEB08 | | 8 | 2 | EEPROM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP48FEB11 | | 1 | 1 | EEPROM |
> + | MCP48FEB12 | 10-bit | 2 | 1 | EEPROM |
> + | MCP48FEB14 | | 4 | 2 | EEPROM |
> + | MCP48FEB18 | | 8 | 2 | EEPROM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP48FEB21 | | 1 | 1 | EEPROM |
> + | MCP48FEB22 | 12-bit | 2 | 1 | EEPROM |
> + | MCP48FEB24 | | 4 | 2 | EEPROM |
> + | MCP48FEB28 | | 8 | 2 | EEPROM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP48FVB01 | | 1 | 1 | RAM |
> + | MCP48FVB02 | 8-bit | 2 | 1 | RAM |
> + | MCP48FVB04 | | 4 | 2 | RAM |
> + | MCP48FVB08 | | 8 | 2 | RAM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP48FVB11 | | 1 | 1 | RAM |
> + | MCP48FVB12 | 10-bit | 2 | 1 | RAM |
> + | MCP48FVB14 | | 4 | 2 | RAM |
> + | MCP48FVB18 | | 8 | 2 | RAM |
> + |------------|--------------|-------------|-------------|------------|
> + | MCP48FVB21 | | 1 | 1 | RAM |
> + | MCP48FVB22 | 12-bit | 2 | 1 | RAM |
> + | MCP48FVB24 | | 4 | 2 | RAM |
> + | MCP48FVB28 | | 8 | 2 | RAM |
> + +------------+--------------+-------------+-------------+------------+
> +
> +properties:
> + compatible:
> + enum:
> + - microchip,mcp48feb01
> + - microchip,mcp48feb02
> + - microchip,mcp48feb04
> + - microchip,mcp48feb08
> + - microchip,mcp48feb11
> + - microchip,mcp48feb12
> + - microchip,mcp48feb14
> + - microchip,mcp48feb18
> + - microchip,mcp48feb21
> + - microchip,mcp48feb22
> + - microchip,mcp48feb24
> + - microchip,mcp48feb28
> + - microchip,mcp48fvb01
> + - microchip,mcp48fvb02
> + - microchip,mcp48fvb04
> + - microchip,mcp48fvb08
> + - microchip,mcp48fvb11
> + - microchip,mcp48fvb12
> + - microchip,mcp48fvb14
> + - microchip,mcp48fvb18
> + - microchip,mcp48fvb21
> + - microchip,mcp48fvb22
> + - microchip,mcp48fvb24
> + - microchip,mcp48fvb28
> +
> + reg:
> + maxItems: 1
> +
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 0
> +
> + vdd-supply:
> + description:
> + Provides power to the chip and it could be used as reference voltage. The
> + voltage is used to calculate scale. For parts without EEPROM at powerup
> + this will be the selected as voltage reference.
> +
> + vref-supply:
> + description: |
> + Vref pin (it could be found as Vref0 into the datasheet) may be used as a
> + voltage reference when this supply is specified. The internal reference
> + will be taken into account for voltage reference besides VDD if this supply
> + does not exist.
> +
> + This supply will be voltage reference 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, Vout4, Vout6;
> +
> + vref1-supply:
> + description: |
> + Vref1 pin may be used as a voltage reference when this supply is specified.
> + The internal reference will be taken into account for voltage reference
> + beside VDD if this supply does not exist.
> +
> + This supply will be voltage reference 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. 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 its 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 its voltage when connected to the internal resistor ladder
> + circuit.
> +
> +patternProperties:
> + "^channel@[0-7]$":
> + $ref: dac.yaml
> + type: object
> + description: Voltage output channel.
> +
> + properties:
> + reg:
> + description: The channel number.
> + maxItems: 1
> +
> + label:
> + description: Unique name to identify which channel this is.
> +
> + required:
> + - reg
> +
> + unevaluatedProperties: false
> +
> +required:
> + - compatible
> + - reg
> + - vdd-supply
> +
> +allOf:
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - microchip,mcp48feb01
> + - microchip,mcp48feb11
> + - microchip,mcp48feb21
> + - microchip,mcp48fvb01
> + - microchip,mcp48fvb11
> + - microchip,mcp48fvb21
> + then:
> + properties:
> + lat1-gpios: false
> + vref1-supply: false
> + microchip,vref1-buffered: false
> + channel@0:
> + properties:
> + reg:
> + const: 0
> + patternProperties:
> + "^channel@[1-7]$": false
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - microchip,mcp48feb02
> + - microchip,mcp48feb12
> + - microchip,mcp48feb22
> + - microchip,mcp48fvb02
> + - microchip,mcp48fvb12
> + - microchip,mcp48fvb22
> + then:
> + properties:
> + lat1-gpios: false
> + vref1-supply: false
> + microchip,vref1-buffered: false
> + patternProperties:
> + "^channel@[0-1]$":
> + properties:
> + reg:
> + enum: [0, 1]
> + "^channel@[2-7]$": false
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - microchip,mcp48fvb04
> + - microchip,mcp48fvb14
> + - microchip,mcp48fvb24
> + - microchip,mcp48feb04
> + - microchip,mcp48feb14
> + - microchip,mcp48feb24
> + then:
> + patternProperties:
> + "^channel@[0-3]$":
> + properties:
> + reg:
> + enum: [0, 1, 2, 3]
> + "^channel@[4-7]$": false
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - microchip,mcp48fvb08
> + - microchip,mcp48fvb18
> + - microchip,mcp48fvb28
> + - microchip,mcp48feb08
> + - microchip,mcp48feb18
> + - microchip,mcp48feb28
> + then:
> + patternProperties:
> + "^channel@[0-7]$":
> + properties:
> + reg:
> + enum: [0, 1, 2, 3, 4, 5, 6, 7]
> + - 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:
> + - |
> + spi {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + dac@0 {
> + compatible = "microchip,mcp48feb08";
> + reg = <0>;
> + vdd-supply = <&vdac_vdd>;
> + vref-supply = <&vref_reg>;
> +
> + #address-cells = <1>;
> + #size-cells = <0>;
> + channel@0 {
> + reg = <0>;
> + label = "Adjustable_voltage_ch0";
> + };
> +
> + channel@1 {
> + reg = <0x1>;
> + label = "Adjustable_voltage_ch1";
> + };
> + };
> + };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index a92290fffa163f9fe8fe3f04bf66426f9a894409..ed24fd2758ad0103dbc5191d0ec180f8ee5e8298 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14945,6 +14945,12 @@ S: Maintained
> F: Documentation/devicetree/bindings/iio/dac/microchip,mcp4821.yaml
> F: drivers/iio/dac/mcp4821.c
>
> +MCP48FEB02 MICROCHIP DAC DRIVER
> +M: Ariana Lazar <ariana.lazar@microchip.com>
> +L: linux-iio@vger.kernel.org
> +S: Supported
> +F: Documentation/devicetree/bindings/iio/dac/microchip,mcp48feb02.yaml
> +
> MCR20A IEEE-802.15.4 RADIO DRIVER
> M: Stefan Schmidt <stefan@datenfreihafen.org>
> L: linux-wpan@vger.kernel.org
>
> --
> 2.43.0
>

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]