diff mbox series

[4/8] dt-bindings: iio: dfsdm: move to backend framework

Message ID 20240618160836.945242-5-olivier.moysan@foss.st.com (mailing list archive)
State New
Headers show
Series iio: adc: dfsdm: add scaling support | expand

Commit Message

Olivier Moysan June 18, 2024, 4:08 p.m. UTC
Change the DFSDM binding to use the new IIO backend framework,
along with the adoption of IIO generic channels.
This binding change allows to add scaling support to the DFSDM.

Keep the legacy binding as deprecated for backward compatibility.

The io-backends property is supported only in generic IIO channel
binding.

- Channel description with the generic binding (Audio and Analog):

  Properties supersed by generic properties:
    st,adc-channels: becomes "reg" property in channel node
    st,adc-channel-names: becomes "label" property in channel node
  Properties moved to channel child node:
    st,adc-channel-types, st,adc-channel-clk-src, st,adc-alt-channel

- Analog binding:

  DFSDM filter channel is configured as an IIO backend consumer.
  Add io-backends property in channel child nodes.

  DFSDM is no more configured as a channel consumer from SD modulator.
  Use of io-channels in DFSDM node is deprecated.

- Audio binding:

  DFSDM audio DAI is configured as a channel consumer from DFSDM filter.
  No change compare to legacy.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
---
 .../bindings/iio/adc/st,stm32-dfsdm-adc.yaml  | 158 +++++++++++++++++-
 1 file changed, 152 insertions(+), 6 deletions(-)

Comments

Conor Dooley June 18, 2024, 6:10 p.m. UTC | #1
On Tue, Jun 18, 2024 at 06:08:30PM +0200, Olivier Moysan wrote:
> Change the DFSDM binding to use the new IIO backend framework,
> along with the adoption of IIO generic channels.
> This binding change allows to add scaling support to the DFSDM.
> 
> Keep the legacy binding as deprecated for backward compatibility.
> 
> The io-backends property is supported only in generic IIO channel
> binding.
> 
> - Channel description with the generic binding (Audio and Analog):
> 
>   Properties supersed by generic properties:
>     st,adc-channels: becomes "reg" property in channel node
>     st,adc-channel-names: becomes "label" property in channel node
>   Properties moved to channel child node:
>     st,adc-channel-types, st,adc-channel-clk-src, st,adc-alt-channel
> 
> - Analog binding:
> 
>   DFSDM filter channel is configured as an IIO backend consumer.
>   Add io-backends property in channel child nodes.
> 
>   DFSDM is no more configured as a channel consumer from SD modulator.
>   Use of io-channels in DFSDM node is deprecated.
> 
> - Audio binding:
> 
>   DFSDM audio DAI is configured as a channel consumer from DFSDM filter.
>   No change compare to legacy.
> 
> Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
> ---
>  .../bindings/iio/adc/st,stm32-dfsdm-adc.yaml  | 158 +++++++++++++++++-
>  1 file changed, 152 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
> index c1b1324fa132..dd414bab74c1 100644
> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
> @@ -102,9 +102,11 @@ patternProperties:
>          items:
>            minimum: 0
>            maximum: 7
> +        deprecated: true
>  
>        st,adc-channel-names:
>          description: List of single-ended channel names.
> +        deprecated: true
>  
>        st,filter-order:
>          description: |
> @@ -118,6 +120,12 @@ patternProperties:
>        "#io-channel-cells":
>          const: 1
>  
> +      '#address-cells':
> +        const: 1
> +
> +      '#size-cells':
> +        const: 0
> +
>        st,adc-channel-types:
>          description: |
>            Single-ended channel input type.
> @@ -128,6 +136,7 @@ patternProperties:
>          items:
>            enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
>          $ref: /schemas/types.yaml#/definitions/non-unique-string-array
> +        deprecated: true
>  
>        st,adc-channel-clk-src:
>          description: |
> @@ -139,6 +148,7 @@ patternProperties:
>          items:
>            enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
>          $ref: /schemas/types.yaml#/definitions/non-unique-string-array
> +        deprecated: true
>  
>        st,adc-alt-channel:
>          description:
> @@ -147,6 +157,7 @@ patternProperties:
>            If not set, channel n is connected to SPI input n.
>            If set, channel n is connected to SPI input n + 1.
>          type: boolean
> +        deprecated: true
>  
>        st,filter0-sync:
>          description:
> @@ -165,11 +176,65 @@ patternProperties:
>        - compatible
>        - reg
>        - interrupts
> -      - st,adc-channels
> -      - st,adc-channel-names
>        - st,filter-order
>        - "#io-channel-cells"
>  
> +    patternProperties:
> +      "^channel@([0-9]|1[0-9])$":
> +        type: object
> +        $ref: adc.yaml
> +        description: Represents the external channels which are connected to the DFSDM.
> +
> +        properties:
> +          reg:
> +            items:
> +              minimum: 0
> +              maximum: 8
> +
> +          label:
> +            description:
> +              Unique name to identify which channel this is.
> +
> +          st,adc-channel-types:
> +            description: |
> +              Single-ended channel input type.
> +              - "SPI_R": SPI with data on rising edge (default)
> +              - "SPI_F": SPI with data on falling edge
> +              - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
> +              - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
> +            items:
> +              enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
> +            $ref: /schemas/types.yaml#/definitions/non-unique-string-array

Why is this an array? And why is the property plural? Can a channel have
more than one type?

> +
> +          st,adc-channel-clk-src:
> +            description: |
> +              Conversion clock source.
> +              - "CLKIN": external SPI clock (CLKIN x)
> +              - "CLKOUT": internal SPI clock (CLKOUT) (default)
> +              - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
> +              - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
> +            items:
> +              enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
> +            $ref: /schemas/types.yaml#/definitions/non-unique-string-array

Ditto here, but s/type/clock source/

Thanks,
Conor.

> +
> +          st,adc-alt-channel:
> +            description:
> +              Must be defined if two sigma delta modulators are
> +              connected on same SPI input.
> +              If not set, channel n is connected to SPI input n.
> +              If set, channel n is connected to SPI input n + 1.
> +            type: boolean
> +
> +          io-backends:
> +            description:
> +              From common IIO binding.

Drop this from the description.

> Used to pipe external sigma delta
> +              modulator or internal ADC backend to DFSDM channel.
> +
> +        required:
> +          - reg
> +
> +        additionalProperties: false
> +
>      allOf:
>        - if:
>            properties:
> @@ -199,9 +264,19 @@ patternProperties:
>                description:
>                  From common IIO binding. Used to pipe external sigma delta
>                  modulator or internal ADC output to DFSDM channel.
> +              deprecated: true
>  
> -          required:
> -            - io-channels
> +          if:
> +            required:
> +              - st,adc-channels
> +          then:
> +            required:
> +              - io-channels
> +
> +          patternProperties:
> +            "^channel@([0-9]|1[0-9])$":
> +              required:
> +                - io-backends

Why is this here, rather than with reg above? Only some channels require
a backend?
Olivier Moysan June 20, 2024, 8:03 a.m. UTC | #2
Hi Conor,

On 6/18/24 20:10, Conor Dooley wrote:
> On Tue, Jun 18, 2024 at 06:08:30PM +0200, Olivier Moysan wrote:
>> Change the DFSDM binding to use the new IIO backend framework,
>> along with the adoption of IIO generic channels.
>> This binding change allows to add scaling support to the DFSDM.
>>
>> Keep the legacy binding as deprecated for backward compatibility.
>>
>> The io-backends property is supported only in generic IIO channel
>> binding.
>>
>> - Channel description with the generic binding (Audio and Analog):
>>
>>    Properties supersed by generic properties:
>>      st,adc-channels: becomes "reg" property in channel node
>>      st,adc-channel-names: becomes "label" property in channel node
>>    Properties moved to channel child node:
>>      st,adc-channel-types, st,adc-channel-clk-src, st,adc-alt-channel
>>
>> - Analog binding:
>>
>>    DFSDM filter channel is configured as an IIO backend consumer.
>>    Add io-backends property in channel child nodes.
>>
>>    DFSDM is no more configured as a channel consumer from SD modulator.
>>    Use of io-channels in DFSDM node is deprecated.
>>
>> - Audio binding:
>>
>>    DFSDM audio DAI is configured as a channel consumer from DFSDM filter.
>>    No change compare to legacy.
>>
>> Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
>> ---
>>   .../bindings/iio/adc/st,stm32-dfsdm-adc.yaml  | 158 +++++++++++++++++-
>>   1 file changed, 152 insertions(+), 6 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
>> index c1b1324fa132..dd414bab74c1 100644
>> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
>> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
>> @@ -102,9 +102,11 @@ patternProperties:
>>           items:
>>             minimum: 0
>>             maximum: 7
>> +        deprecated: true
>>   
>>         st,adc-channel-names:
>>           description: List of single-ended channel names.
>> +        deprecated: true
>>   
>>         st,filter-order:
>>           description: |
>> @@ -118,6 +120,12 @@ patternProperties:
>>         "#io-channel-cells":
>>           const: 1
>>   
>> +      '#address-cells':
>> +        const: 1
>> +
>> +      '#size-cells':
>> +        const: 0
>> +
>>         st,adc-channel-types:
>>           description: |
>>             Single-ended channel input type.
>> @@ -128,6 +136,7 @@ patternProperties:
>>           items:
>>             enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
>>           $ref: /schemas/types.yaml#/definitions/non-unique-string-array
>> +        deprecated: true
>>   
>>         st,adc-channel-clk-src:
>>           description: |
>> @@ -139,6 +148,7 @@ patternProperties:
>>           items:
>>             enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
>>           $ref: /schemas/types.yaml#/definitions/non-unique-string-array
>> +        deprecated: true
>>   
>>         st,adc-alt-channel:
>>           description:
>> @@ -147,6 +157,7 @@ patternProperties:
>>             If not set, channel n is connected to SPI input n.
>>             If set, channel n is connected to SPI input n + 1.
>>           type: boolean
>> +        deprecated: true
>>   
>>         st,filter0-sync:
>>           description:
>> @@ -165,11 +176,65 @@ patternProperties:
>>         - compatible
>>         - reg
>>         - interrupts
>> -      - st,adc-channels
>> -      - st,adc-channel-names
>>         - st,filter-order
>>         - "#io-channel-cells"
>>   
>> +    patternProperties:
>> +      "^channel@([0-9]|1[0-9])$":
>> +        type: object
>> +        $ref: adc.yaml
>> +        description: Represents the external channels which are connected to the DFSDM.
>> +
>> +        properties:
>> +          reg:
>> +            items:
>> +              minimum: 0
>> +              maximum: 8
>> +
>> +          label:
>> +            description:
>> +              Unique name to identify which channel this is.
>> +
>> +          st,adc-channel-types:
>> +            description: |
>> +              Single-ended channel input type.
>> +              - "SPI_R": SPI with data on rising edge (default)
>> +              - "SPI_F": SPI with data on falling edge
>> +              - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
>> +              - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
>> +            items:
>> +              enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
>> +            $ref: /schemas/types.yaml#/definitions/non-unique-string-array
> 
> Why is this an array? And why is the property plural? Can a channel have
> more than one type?
> 

You are right. In channel node context, this property is no more an 
array. It has to be managed as a single string (This is already the case 
in the driver). I will change the type in binding and the name, to 
reflect this.

>> +
>> +          st,adc-channel-clk-src:
>> +            description: |
>> +              Conversion clock source.
>> +              - "CLKIN": external SPI clock (CLKIN x)
>> +              - "CLKOUT": internal SPI clock (CLKOUT) (default)
>> +              - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
>> +              - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
>> +            items:
>> +              enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
>> +            $ref: /schemas/types.yaml#/definitions/non-unique-string-array
> 
> Ditto here, but s/type/clock source/
> 

Same here.

> Thanks,
> Conor.
> 
>> +
>> +          st,adc-alt-channel:
>> +            description:
>> +              Must be defined if two sigma delta modulators are
>> +              connected on same SPI input.
>> +              If not set, channel n is connected to SPI input n.
>> +              If set, channel n is connected to SPI input n + 1.
>> +            type: boolean
>> +
>> +          io-backends:
>> +            description:
>> +              From common IIO binding.
> 
> Drop this from the description.
> 
>> Used to pipe external sigma delta
>> +              modulator or internal ADC backend to DFSDM channel.
>> +
>> +        required:
>> +          - reg
>> +
>> +        additionalProperties: false
>> +
>>       allOf:
>>         - if:
>>             properties:
>> @@ -199,9 +264,19 @@ patternProperties:
>>                 description:
>>                   From common IIO binding. Used to pipe external sigma delta
>>                   modulator or internal ADC output to DFSDM channel.
>> +              deprecated: true
>>   
>> -          required:
>> -            - io-channels
>> +          if:
>> +            required:
>> +              - st,adc-channels
>> +          then:
>> +            required:
>> +              - io-channels
>> +
>> +          patternProperties:
>> +            "^channel@([0-9]|1[0-9])$":
>> +              required:
>> +                - io-backends
> 
> Why is this here, rather than with reg above? Only some channels require
> a backend?

The io-backends property is required only when we use st,stm32-dfsdm-adc 
compatible. In other words, when we are in an analog use case. In this 
case the channel is a consumer of a backend (typically a sd modulator)
In an audio use case (compatible st,stm32-dfsdm-dmic) the backend is not 
required.

BRs
Olivier
Conor Dooley June 20, 2024, 8:51 a.m. UTC | #3
On Thu, Jun 20, 2024 at 10:03:44AM +0200, Olivier MOYSAN wrote:
> On 6/18/24 20:10, Conor Dooley wrote:
> > On Tue, Jun 18, 2024 at 06:08:30PM +0200, Olivier Moysan wrote:
> > >       allOf:
> > >         - if:
> > >             properties:
> > > @@ -199,9 +264,19 @@ patternProperties:
> > >                 description:
> > >                   From common IIO binding. Used to pipe external sigma delta
> > >                   modulator or internal ADC output to DFSDM channel.
> > > +              deprecated: true
> > > -          required:
> > > -            - io-channels
> > > +          if:
> > > +            required:
> > > +              - st,adc-channels
> > > +          then:
> > > +            required:
> > > +              - io-channels
> > > +
> > > +          patternProperties:
> > > +            "^channel@([0-9]|1[0-9])$":
> > > +              required:
> > > +                - io-backends
> > 
> > Why is this here, rather than with reg above? Only some channels require
> > a backend?
> 
> The io-backends property is required only when we use st,stm32-dfsdm-adc
> compatible. In other words, when we are in an analog use case. In this case
> the channel is a consumer of a backend (typically a sd modulator)
> In an audio use case (compatible st,stm32-dfsdm-dmic) the backend is not
> required.

Ahh, I think the hunks and indent confused me here. What you're doing is
making io-backends required based on the compatible, but what I thought
you were doing was trying to make io-backends required in channels if
st,adc-channels was set.

Thanks for the explanation,
Conor.
Jonathan Cameron June 23, 2024, 3:01 p.m. UTC | #4
On Tue, 18 Jun 2024 18:08:30 +0200
Olivier Moysan <olivier.moysan@foss.st.com> wrote:

> Change the DFSDM binding to use the new IIO backend framework,
> along with the adoption of IIO generic channels.
> This binding change allows to add scaling support to the DFSDM.
> 
> Keep the legacy binding as deprecated for backward compatibility.
> 
> The io-backends property is supported only in generic IIO channel
> binding.
> 
> - Channel description with the generic binding (Audio and Analog):
> 
>   Properties supersed by generic properties:
superseded

>     st,adc-channels: becomes "reg" property in channel node
>     st,adc-channel-names: becomes "label" property in channel node
>   Properties moved to channel child node:
>     st,adc-channel-types, st,adc-channel-clk-src, st,adc-alt-channel
> 
> - Analog binding:
> 
>   DFSDM filter channel is configured as an IIO backend consumer.
>   Add io-backends property in channel child nodes.
> 
>   DFSDM is no more configured as a channel consumer from SD modulator.
>   Use of io-channels in DFSDM node is deprecated.
> 
> - Audio binding:
> 
>   DFSDM audio DAI is configured as a channel consumer from DFSDM filter.
>   No change compare to legacy.
> 
> Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
index c1b1324fa132..dd414bab74c1 100644
--- a/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-dfsdm-adc.yaml
@@ -102,9 +102,11 @@  patternProperties:
         items:
           minimum: 0
           maximum: 7
+        deprecated: true
 
       st,adc-channel-names:
         description: List of single-ended channel names.
+        deprecated: true
 
       st,filter-order:
         description: |
@@ -118,6 +120,12 @@  patternProperties:
       "#io-channel-cells":
         const: 1
 
+      '#address-cells':
+        const: 1
+
+      '#size-cells':
+        const: 0
+
       st,adc-channel-types:
         description: |
           Single-ended channel input type.
@@ -128,6 +136,7 @@  patternProperties:
         items:
           enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
         $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+        deprecated: true
 
       st,adc-channel-clk-src:
         description: |
@@ -139,6 +148,7 @@  patternProperties:
         items:
           enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
         $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+        deprecated: true
 
       st,adc-alt-channel:
         description:
@@ -147,6 +157,7 @@  patternProperties:
           If not set, channel n is connected to SPI input n.
           If set, channel n is connected to SPI input n + 1.
         type: boolean
+        deprecated: true
 
       st,filter0-sync:
         description:
@@ -165,11 +176,65 @@  patternProperties:
       - compatible
       - reg
       - interrupts
-      - st,adc-channels
-      - st,adc-channel-names
       - st,filter-order
       - "#io-channel-cells"
 
+    patternProperties:
+      "^channel@([0-9]|1[0-9])$":
+        type: object
+        $ref: adc.yaml
+        description: Represents the external channels which are connected to the DFSDM.
+
+        properties:
+          reg:
+            items:
+              minimum: 0
+              maximum: 8
+
+          label:
+            description:
+              Unique name to identify which channel this is.
+
+          st,adc-channel-types:
+            description: |
+              Single-ended channel input type.
+              - "SPI_R": SPI with data on rising edge (default)
+              - "SPI_F": SPI with data on falling edge
+              - "MANCH_R": manchester codec, rising edge = logic 0, falling edge = logic 1
+              - "MANCH_F": manchester codec, rising edge = logic 1, falling edge = logic 0
+            items:
+              enum: [ SPI_R, SPI_F, MANCH_R, MANCH_F ]
+            $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+
+          st,adc-channel-clk-src:
+            description: |
+              Conversion clock source.
+              - "CLKIN": external SPI clock (CLKIN x)
+              - "CLKOUT": internal SPI clock (CLKOUT) (default)
+              - "CLKOUT_F": internal SPI clock divided by 2 (falling edge).
+              - "CLKOUT_R": internal SPI clock divided by 2 (rising edge).
+            items:
+              enum: [ CLKIN, CLKOUT, CLKOUT_F, CLKOUT_R ]
+            $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+
+          st,adc-alt-channel:
+            description:
+              Must be defined if two sigma delta modulators are
+              connected on same SPI input.
+              If not set, channel n is connected to SPI input n.
+              If set, channel n is connected to SPI input n + 1.
+            type: boolean
+
+          io-backends:
+            description:
+              From common IIO binding. Used to pipe external sigma delta
+              modulator or internal ADC backend to DFSDM channel.
+
+        required:
+          - reg
+
+        additionalProperties: false
+
     allOf:
       - if:
           properties:
@@ -199,9 +264,19 @@  patternProperties:
               description:
                 From common IIO binding. Used to pipe external sigma delta
                 modulator or internal ADC output to DFSDM channel.
+              deprecated: true
 
-          required:
-            - io-channels
+          if:
+            required:
+              - st,adc-channels
+          then:
+            required:
+              - io-channels
+
+          patternProperties:
+            "^channel@([0-9]|1[0-9])$":
+              required:
+                - io-backends
 
       - if:
           properties:
@@ -294,7 +369,77 @@  examples:
       #address-cells = <1>;
       #size-cells = <0>;
 
+      // Example 1: Audio use case with generic binding
       dfsdm0: filter@0 {
+        compatible = "st,stm32-dfsdm-dmic";
+        reg = <0>;
+        interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
+        dmas = <&dmamux1 101 0x400 0x01>;
+        dma-names = "rx";
+        #io-channel-cells = <1>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        st,filter-order = <5>;
+
+        channel@1 {
+          reg = <1>;
+          label = "dmic0";
+          st,adc-channel-types = "SPI_R";
+          st,adc-channel-clk-src = "CLKOUT";
+          st,adc-alt-channel;
+        };
+
+        asoc_pdm0: dfsdm-dai {
+          compatible = "st,stm32h7-dfsdm-dai";
+          #sound-dai-cells = <0>;
+          io-channels = <&dfsdm0 0>;
+        };
+      };
+
+      // Example 1: Analog use case with generic binding
+      dfsdm1: filter@1 {
+        compatible = "st,stm32-dfsdm-adc";
+        reg = <1>;
+        interrupts = <GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH>;
+        dmas = <&dmamux1 102 0x400 0x01>;
+        dma-names = "rx";
+        st,filter-order = <1>;
+        #io-channel-cells = <1>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        channel@2 {
+          reg = <2>;
+          label = "in2";
+          st,adc-channel-types = "SPI_F";
+          st,adc-channel-clk-src = "CLKOUT";
+          st,adc-alt-channel;
+          io-backends = <&sd_adc2>;
+        };
+
+        channel@3 {
+          reg = <3>;
+          label = "in3";
+          st,adc-channel-types = "SPI_R";
+          st,adc-channel-clk-src = "CLKOUT";
+          io-backends = <&sd_adc3>;
+        };
+      };
+    };
+
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/stm32mp1-clks.h>
+    dfsdm_2: dfsdm@4400d000 {
+      compatible = "st,stm32mp1-dfsdm";
+      reg = <0x4400d000 0x800>;
+      clocks = <&rcc DFSDM_K>, <&rcc ADFSDM_K>;
+      clock-names = "dfsdm", "audio";
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      // Example 3: Audio use case with legacy binding
+      dfsdm0_2: filter@0 {
         compatible = "st,stm32-dfsdm-dmic";
         reg = <0>;
         interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
@@ -307,14 +452,15 @@  examples:
         st,adc-channel-clk-src = "CLKOUT";
         st,filter-order = <5>;
 
-        asoc_pdm0: dfsdm-dai {
+        asoc_pdm0_2: dfsdm-dai {
           compatible = "st,stm32h7-dfsdm-dai";
           #sound-dai-cells = <0>;
           io-channels = <&dfsdm0 0>;
         };
       };
 
-      dfsdm_pdm1: filter@1 {
+      // Example 3: Analog use case with legacy binding
+      dfsdm1_2: filter@1 {
         compatible = "st,stm32-dfsdm-adc";
         reg = <1>;
         interrupts = <GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH>;