diff mbox series

[v2,1/2] dt-bindings: staging: iio: cdc: ad7746: add binding documentation for AD7746

Message ID 54a9eaeaa42d47037b2a07bd933e6dfade745d02.1618785336.git.lucas.p.stankus@gmail.com (mailing list archive)
State New
Headers show
Series staging: iio: cdc: ad7746: add dt properties for capacitive channel setup | expand

Commit Message

Lucas Stankus April 18, 2021, 10:49 p.m. UTC
Add device tree binding documentation for AD7746 cdc in YAML format.

Signed-off-by: Lucas Stankus <lucas.p.stankus@gmail.com>
---

A minor note about the adi,excitation-vdd-permille property. Jonathan
suggested the name to be adi,excitation-vdd-milicent, but I was unsure of
the milicent naming. With a quick search I found out that the common way to
call a thousandth is 'per mille'[1], but I didn't find any use of it in the
kernel documentation. Any thoughts about it?

[1] https://en.wikipedia.org/wiki/Per_mille

 .../bindings/iio/cdc/adi,ad7746.yaml          | 73 +++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml

Comments

Rob Herring April 20, 2021, 7:37 p.m. UTC | #1
On Sun, Apr 18, 2021 at 07:49:51PM -0300, Lucas Stankus wrote:
> Add device tree binding documentation for AD7746 cdc in YAML format.
> 
> Signed-off-by: Lucas Stankus <lucas.p.stankus@gmail.com>
> ---
> 
> A minor note about the adi,excitation-vdd-permille property. Jonathan
> suggested the name to be adi,excitation-vdd-milicent, but I was unsure of
> the milicent naming. With a quick search I found out that the common way to
> call a thousandth is 'per mille'[1], but I didn't find any use of it in the
> kernel documentation. Any thoughts about it?

Seems okay to me.

> [1] https://en.wikipedia.org/wiki/Per_mille
> 
>  .../bindings/iio/cdc/adi,ad7746.yaml          | 73 +++++++++++++++++++
>  1 file changed, 73 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> new file mode 100644
> index 000000000000..a2a7eee674ba
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> @@ -0,0 +1,73 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/cdc/adi,ad7746.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
> +
> +maintainers:
> +  - Michael Hennerich <michael.hennerich@analog.com>
> +
> +description: |
> +  AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
> +
> +  Specifications about the part can be found at:
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7291.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad7745
> +      - adi,ad7746
> +      - adi,ad7747
> +
> +  reg:
> +    maxItems: 1
> +
> +  adi,excitation-vdd-permille:
> +    description: |
> +      Set VDD per mille to be used as the excitation voltage.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [125, 250, 375, 500]
> +
> +  adi,exca-output-en:
> +    description: Enables the EXCA pin as the excitation output.
> +    type: boolean
> +
> +  adi,exca-output-invert:
> +    description: Inverts the excitation output in the EXCA pin.
> +    type: boolean

'invert' assumes I know what the non-inverted signal is. Sometimes that 
makes sense, but if you can define in terms of the inverse that would be 
better. For example, for a normally active low signal, name the property 
'foo-active-high'.

> +
> +  adi,excb-output-en:
> +    description: Enables the EXCB pin as the excitation output.
> +    type: boolean
> +
> +  adi,excb-output-invert:
> +    description: Inverts the excitation output in the EXCB pin.
> +    type: boolean
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      ad7746: cdc@48 {
> +        compatible = "adi,ad7746";
> +        reg = <0x48>;
> +        adi,excitation-vdd-permille = <125>;
> +
> +        adi,exca-output-en;
> +        adi,exca-output-invert;
> +        adi,excb-output-en;
> +        adi,excb-output-invert;
> +      };
> +    };
> +...
> -- 
> 2.31.1
>
Lucas Stankus April 22, 2021, 7:16 p.m. UTC | #2
On Tue, Apr 20, 2021 at 4:37 PM Rob Herring <robh@kernel.org> wrote:
>
> On Sun, Apr 18, 2021 at 07:49:51PM -0300, Lucas Stankus wrote:
> > Add device tree binding documentation for AD7746 cdc in YAML format.
> >
> > Signed-off-by: Lucas Stankus <lucas.p.stankus@gmail.com>
> > ---
> >
> > A minor note about the adi,excitation-vdd-permille property. Jonathan
> > suggested the name to be adi,excitation-vdd-milicent, but I was unsure of
> > the milicent naming. With a quick search I found out that the common way to
> > call a thousandth is 'per mille'[1], but I didn't find any use of it in the
> > kernel documentation. Any thoughts about it?
>
> Seems okay to me.
>
> > [1] https://en.wikipedia.org/wiki/Per_mille
> >
> >  .../bindings/iio/cdc/adi,ad7746.yaml          | 73 +++++++++++++++++++
> >  1 file changed, 73 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> > new file mode 100644
> > index 000000000000..a2a7eee674ba
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> > @@ -0,0 +1,73 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/cdc/adi,ad7746.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
> > +
> > +maintainers:
> > +  - Michael Hennerich <michael.hennerich@analog.com>
> > +
> > +description: |
> > +  AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
> > +
> > +  Specifications about the part can be found at:
> > +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7291.pdf
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - adi,ad7745
> > +      - adi,ad7746
> > +      - adi,ad7747
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  adi,excitation-vdd-permille:
> > +    description: |
> > +      Set VDD per mille to be used as the excitation voltage.
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    enum: [125, 250, 375, 500]
> > +
> > +  adi,exca-output-en:
> > +    description: Enables the EXCA pin as the excitation output.
> > +    type: boolean
> > +
> > +  adi,exca-output-invert:
> > +    description: Inverts the excitation output in the EXCA pin.
> > +    type: boolean
>
> 'invert' assumes I know what the non-inverted signal is. Sometimes that
> makes sense, but if you can define in terms of the inverse that would be
> better. For example, for a normally active low signal, name the property
> 'foo-active-high'.

Thanks for the feedback!
From reading the data sheet I couldn't quite grasp what would be an inverted
excitation output, but I don't have a lot of experience with CDCs. Maybe someone
with more experience could help out with a better suggestion.

>
> > +
> > +  adi,excb-output-en:
> > +    description: Enables the EXCB pin as the excitation output.
> > +    type: boolean
> > +
> > +  adi,excb-output-invert:
> > +    description: Inverts the excitation output in the EXCB pin.
> > +    type: boolean
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    i2c {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +
> > +      ad7746: cdc@48 {
> > +        compatible = "adi,ad7746";
> > +        reg = <0x48>;
> > +        adi,excitation-vdd-permille = <125>;
> > +
> > +        adi,exca-output-en;
> > +        adi,exca-output-invert;
> > +        adi,excb-output-en;
> > +        adi,excb-output-invert;
> > +      };
> > +    };
> > +...
> > --
> > 2.31.1
> >
Lars-Peter Clausen April 22, 2021, 8:56 p.m. UTC | #3
On 4/22/21 9:16 PM, Lucas Stankus wrote:
> On Tue, Apr 20, 2021 at 4:37 PM Rob Herring <robh@kernel.org> wrote:
>> On Sun, Apr 18, 2021 at 07:49:51PM -0300, Lucas Stankus wrote:
>>> Add device tree binding documentation for AD7746 cdc in YAML format.
>>>
>>> Signed-off-by: Lucas Stankus <lucas.p.stankus@gmail.com>
>>> ---
>>>
>>> A minor note about the adi,excitation-vdd-permille property. Jonathan
>>> suggested the name to be adi,excitation-vdd-milicent, but I was unsure of
>>> the milicent naming. With a quick search I found out that the common way to
>>> call a thousandth is 'per mille'[1], but I didn't find any use of it in the
>>> kernel documentation. Any thoughts about it?
>> Seems okay to me.
>>
>>> [1] https://en.wikipedia.org/wiki/Per_mille
>>>
>>>   .../bindings/iio/cdc/adi,ad7746.yaml          | 73 +++++++++++++++++++
>>>   1 file changed, 73 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
>>> new file mode 100644
>>> index 000000000000..a2a7eee674ba
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
>>> @@ -0,0 +1,73 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/iio/cdc/adi,ad7746.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
>>> +
>>> +maintainers:
>>> +  - Michael Hennerich <michael.hennerich@analog.com>
>>> +
>>> +description: |
>>> +  AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
>>> +
>>> +  Specifications about the part can be found at:
>>> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7291.pdf
>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - adi,ad7745
>>> +      - adi,ad7746
>>> +      - adi,ad7747
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  adi,excitation-vdd-permille:
>>> +    description: |
>>> +      Set VDD per mille to be used as the excitation voltage.
>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>> +    enum: [125, 250, 375, 500]
>>> +
>>> +  adi,exca-output-en:
>>> +    description: Enables the EXCA pin as the excitation output.
>>> +    type: boolean
>>> +
>>> +  adi,exca-output-invert:
>>> +    description: Inverts the excitation output in the EXCA pin.
>>> +    type: boolean
>> 'invert' assumes I know what the non-inverted signal is. Sometimes that
>> makes sense, but if you can define in terms of the inverse that would be
>> better. For example, for a normally active low signal, name the property
>> 'foo-active-high'.
> Thanks for the feedback!
>  From reading the data sheet I couldn't quite grasp what would be an inverted
> excitation output, but I don't have a lot of experience with CDCs. Maybe someone
> with more experience could help out with a better suggestion.

This is the only thing I could find 
https://www.analog.com/media/en/technical-documentation/application-notes/AN-1585.pdf.

The datasheet also says that only at most one of them should be 
inverted. So maybe only a single property which selects which of the two 
is inverted.
Jonathan Cameron April 24, 2021, 11:54 a.m. UTC | #4
On Tue, 20 Apr 2021 14:37:46 -0500
Rob Herring <robh@kernel.org> wrote:

> On Sun, Apr 18, 2021 at 07:49:51PM -0300, Lucas Stankus wrote:
> > Add device tree binding documentation for AD7746 cdc in YAML format.
> > 
> > Signed-off-by: Lucas Stankus <lucas.p.stankus@gmail.com>
> > ---
> > 
> > A minor note about the adi,excitation-vdd-permille property. Jonathan
> > suggested the name to be adi,excitation-vdd-milicent, but I was unsure of
> > the milicent naming. With a quick search I found out that the common way to
> > call a thousandth is 'per mille'[1], but I didn't find any use of it in the
> > kernel documentation. Any thoughts about it?  
> 
> Seems okay to me.

Sorry about that.  I realised later in the day I was talking garbage, but
forgot to send a reply to say that when I was next on my computer :(
permille was what I mean.

> 
> > [1] https://en.wikipedia.org/wiki/Per_mille
> > 
> >  .../bindings/iio/cdc/adi,ad7746.yaml          | 73 +++++++++++++++++++
> >  1 file changed, 73 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> > new file mode 100644
> > index 000000000000..a2a7eee674ba
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> > @@ -0,0 +1,73 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/cdc/adi,ad7746.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
> > +
> > +maintainers:
> > +  - Michael Hennerich <michael.hennerich@analog.com>
> > +
> > +description: |
> > +  AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
> > +
> > +  Specifications about the part can be found at:
> > +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7291.pdf
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - adi,ad7745
> > +      - adi,ad7746
> > +      - adi,ad7747
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  adi,excitation-vdd-permille:
> > +    description: |
> > +      Set VDD per mille to be used as the excitation voltage.
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    enum: [125, 250, 375, 500]
> > +
> > +  adi,exca-output-en:
> > +    description: Enables the EXCA pin as the excitation output.
> > +    type: boolean
> > +
> > +  adi,exca-output-invert:
> > +    description: Inverts the excitation output in the EXCA pin.
> > +    type: boolean  
> 
> 'invert' assumes I know what the non-inverted signal is. Sometimes that 
> makes sense, but if you can define in terms of the inverse that would be 
> better. For example, for a normally active low signal, name the property 
> 'foo-active-high'.
> 
> > +
> > +  adi,excb-output-en:
> > +    description: Enables the EXCB pin as the excitation output.
> > +    type: boolean
> > +
> > +  adi,excb-output-invert:
> > +    description: Inverts the excitation output in the EXCB pin.
> > +    type: boolean
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    i2c {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +
> > +      ad7746: cdc@48 {
> > +        compatible = "adi,ad7746";
> > +        reg = <0x48>;
> > +        adi,excitation-vdd-permille = <125>;
> > +
> > +        adi,exca-output-en;
> > +        adi,exca-output-invert;
> > +        adi,excb-output-en;
> > +        adi,excb-output-invert;
> > +      };
> > +    };
> > +...
> > -- 
> > 2.31.1
> >
Jonathan Cameron April 24, 2021, noon UTC | #5
On Thu, 22 Apr 2021 22:56:38 +0200
Lars-Peter Clausen <lars@metafoo.de> wrote:

> On 4/22/21 9:16 PM, Lucas Stankus wrote:
> > On Tue, Apr 20, 2021 at 4:37 PM Rob Herring <robh@kernel.org> wrote:  
> >> On Sun, Apr 18, 2021 at 07:49:51PM -0300, Lucas Stankus wrote:  
> >>> Add device tree binding documentation for AD7746 cdc in YAML format.
> >>>
> >>> Signed-off-by: Lucas Stankus <lucas.p.stankus@gmail.com>
> >>> ---
> >>>
> >>> A minor note about the adi,excitation-vdd-permille property. Jonathan
> >>> suggested the name to be adi,excitation-vdd-milicent, but I was unsure of
> >>> the milicent naming. With a quick search I found out that the common way to
> >>> call a thousandth is 'per mille'[1], but I didn't find any use of it in the
> >>> kernel documentation. Any thoughts about it?  
> >> Seems okay to me.
> >>  
> >>> [1] https://en.wikipedia.org/wiki/Per_mille
> >>>
> >>>   .../bindings/iio/cdc/adi,ad7746.yaml          | 73 +++++++++++++++++++
> >>>   1 file changed, 73 insertions(+)
> >>>   create mode 100644 Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> >>>
> >>> diff --git a/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> >>> new file mode 100644
> >>> index 000000000000..a2a7eee674ba
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
> >>> @@ -0,0 +1,73 @@
> >>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> >>> +%YAML 1.2
> >>> +---
> >>> +$id: http://devicetree.org/schemas/iio/cdc/adi,ad7746.yaml#
> >>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>> +
> >>> +title: AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
> >>> +
> >>> +maintainers:
> >>> +  - Michael Hennerich <michael.hennerich@analog.com>
> >>> +
> >>> +description: |
> >>> +  AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
> >>> +
> >>> +  Specifications about the part can be found at:
> >>> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7291.pdf
> >>> +
> >>> +properties:
> >>> +  compatible:
> >>> +    enum:
> >>> +      - adi,ad7745
> >>> +      - adi,ad7746
> >>> +      - adi,ad7747
> >>> +
> >>> +  reg:
> >>> +    maxItems: 1
> >>> +
> >>> +  adi,excitation-vdd-permille:
> >>> +    description: |
> >>> +      Set VDD per mille to be used as the excitation voltage.
> >>> +    $ref: /schemas/types.yaml#/definitions/uint32
> >>> +    enum: [125, 250, 375, 500]
> >>> +
> >>> +  adi,exca-output-en:
> >>> +    description: Enables the EXCA pin as the excitation output.
> >>> +    type: boolean
> >>> +
> >>> +  adi,exca-output-invert:
> >>> +    description: Inverts the excitation output in the EXCA pin.
> >>> +    type: boolean  
> >> 'invert' assumes I know what the non-inverted signal is. Sometimes that
> >> makes sense, but if you can define in terms of the inverse that would be
> >> better. For example, for a normally active low signal, name the property
> >> 'foo-active-high'.  
> > Thanks for the feedback!
> >  From reading the data sheet I couldn't quite grasp what would be an inverted
> > excitation output, but I don't have a lot of experience with CDCs. Maybe someone
> > with more experience could help out with a better suggestion.  
> 
> This is the only thing I could find 
> https://www.analog.com/media/en/technical-documentation/application-notes/AN-1585.pdf.
> 
> The datasheet also says that only at most one of them should be 
> inverted. So maybe only a single property which selects which of the two 
> is inverted.
> 
> 

Nice. I was wondering what on earth that was for as well.  That note
makes it a little clearer!

I'd keep them as separate properties because there 'might' be another
circuit where inverting them both makes sense (though I have no idea
what it would look like). A reference to that note though to explain
why you might do this would be great to have the dt property description.

If anyone ever actually does do this, we'll need to add a description
of the analog front end somehow to actually support reporting in
meaningful units.

Let's not tackle that problem today though and it might be we'd actually
just use a generic AFE IIO consumer to do the scaling rather than needing
anything custom.

Jonathan
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
new file mode 100644
index 000000000000..a2a7eee674ba
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/cdc/adi,ad7746.yaml
@@ -0,0 +1,73 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/cdc/adi,ad7746.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
+
+maintainers:
+  - Michael Hennerich <michael.hennerich@analog.com>
+
+description: |
+  AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
+
+  Specifications about the part can be found at:
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7291.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7745
+      - adi,ad7746
+      - adi,ad7747
+
+  reg:
+    maxItems: 1
+
+  adi,excitation-vdd-permille:
+    description: |
+      Set VDD per mille to be used as the excitation voltage.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [125, 250, 375, 500]
+
+  adi,exca-output-en:
+    description: Enables the EXCA pin as the excitation output.
+    type: boolean
+
+  adi,exca-output-invert:
+    description: Inverts the excitation output in the EXCA pin.
+    type: boolean
+
+  adi,excb-output-en:
+    description: Enables the EXCB pin as the excitation output.
+    type: boolean
+
+  adi,excb-output-invert:
+    description: Inverts the excitation output in the EXCB pin.
+    type: boolean
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      ad7746: cdc@48 {
+        compatible = "adi,ad7746";
+        reg = <0x48>;
+        adi,excitation-vdd-permille = <125>;
+
+        adi,exca-output-en;
+        adi,exca-output-invert;
+        adi,excb-output-en;
+        adi,excb-output-invert;
+      };
+    };
+...