diff mbox series

[5/7] dt-bindings: iio: adc: add ad458x

Message ID 20240923101206.3753-6-antoniu.miclaus@analog.com (mailing list archive)
State Changes Requested
Headers show
Series *** Add support for AD485x DAS Family *** | expand

Commit Message

Miclaus, Antoniu Sept. 23, 2024, 10:10 a.m. UTC 
Add devicetree bindings for ad458x DAS family.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
---
 .../bindings/iio/adc/adi,ad485x.yaml          | 82 +++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml

Comments

Conor Dooley Sept. 23, 2024, 9:20 p.m. UTC | #1 
On Mon, Sep 23, 2024 at 01:10:22PM +0300, Antoniu Miclaus wrote:
> Add devicetree bindings for ad458x DAS family.
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
> ---
>  .../bindings/iio/adc/adi,ad485x.yaml          | 82 +++++++++++++++++++
>  1 file changed, 82 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml
> new file mode 100644
> index 000000000000..5f5bdfa9522b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml
> @@ -0,0 +1,82 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2022 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/adi,ad485x.yaml#

The filename should match one of the compatibles.

> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD485X DAS family device driver
> +
> +maintainers:
> +  - Sergiu Cuciurean <sergiu.cuciurean@analog.com>
> +  - Dragos Bogdan <dragos.bogdan@analog.com>
> +  - Antoniu Miclaus <antoniu.miclaus@analog.com>
> +
> +description: |
> +  Analog Devices AD485X DAS family
> +
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad4858.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad4858
> +      - adi,ad4857
> +      - adi,ad4856
> +      - adi,ad4855
> +      - adi,ad4854
> +      - adi,ad4853
> +      - adi,ad4852
> +      - adi,ad4851
> +      - adi,ad4858i

I take it that all of these devices have some differences between them?

Everything else here seems pretty okay.
David Lechner Sept. 24, 2024, 1:42 p.m. UTC | #2 
On Mon, Sep 23, 2024 at 12:17 PM Antoniu Miclaus
<antoniu.miclaus@analog.com> wrote:
>
> Add devicetree bindings for ad458x DAS family.
>
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
> ---
>  .../bindings/iio/adc/adi,ad485x.yaml          | 82 +++++++++++++++++++
>  1 file changed, 82 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml
> new file mode 100644
> index 000000000000..5f5bdfa9522b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml
> @@ -0,0 +1,82 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2022 Analog Devices Inc.
> +%YAML 1.2
> +---

I think we could make the bindings a bit more complete (even if the
driver doesn't use everything yet). Some suggestions below.

> +$id: http://devicetree.org/schemas/iio/adc/adi,ad485x.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD485X DAS family device driver
> +
> +maintainers:
> +  - Sergiu Cuciurean <sergiu.cuciurean@analog.com>
> +  - Dragos Bogdan <dragos.bogdan@analog.com>
> +  - Antoniu Miclaus <antoniu.miclaus@analog.com>
> +
> +description: |
> +  Analog Devices AD485X DAS family
> +
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad4858.pdf

Links for other parts? (I only looked at this datasheet, so some of my
comments below might only apply to this part and not the others.)

Since this is a SPI peripheral, we should add...

$ref: /schemas/spi/spi-peripheral-props.yaml#

> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad4858
> +      - adi,ad4857
> +      - adi,ad4856
> +      - adi,ad4855
> +      - adi,ad4854
> +      - adi,ad4853
> +      - adi,ad4852
> +      - adi,ad4851
> +      - adi,ad4858i
> +
> +  reg:
> +    maxItems: 1
> +
> +  vcc-supply: true

Do we also need vee-supply (it can be a negative voltage or 0V)? Or is
vcc-supply the voltage between V_CC and V_EE?

> +
> +  vdd-supply: true
> +
> +  vddh-supply: true

Datasheet says V_DDL can be the same or separate supply as V_DDH, so
should probably also have vddl-supply: true.

> +
> +  vio-supply: true

What about reference supplies (REFIO and REFBUF)?

> +
> +  pwms:
> +    maxItems: 1

I suppose this is connected to the CNV pin? Probably worth adding a
description to say that since it isn't so obvious.

> +
> +  io-backends:
> +    maxItems: 1

For PD pin (power down):

pd-gpios:
    maxItems: 1

> +
> +  spi-max-frequency:
> +    maximum: 100000000

Datasheet says that minimum CSCK Period is 40 ns, so that would be
25000000 Hz max frequency.

> +
> +required:
> +  - compatible
> +  - reg
> +  - vcc-supply
> +  - vdd-supply
> +  - vddh-supply

Datasheet says to tie V_DDH to GND to disable LDO, so it sounds like
vddh-supply should be optional, not required.

> +  - vio-supply
> +  - pwms
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        adc@0{
> +            compatible = "adi,ad4858";
> +            reg = <0>;
> +            spi-max-frequency = <10000000>;
> +            vcc-supply = <&vcc>;
> +            vdd-supply = <&vdd>;
> +            vddh-supply = <&vddh>;
> +            vio-supply = <&vio>;
> +            pwms = <&pwm_gen 0 0>;
> +            io-backends = <&iio_backend>;
> +        };
> +    };
> +...
> --
> 2.46.0
>
Rob Herring (Arm) Sept. 24, 2024, 10:32 p.m. UTC | #3 
On Mon, Sep 23, 2024 at 01:10:22PM +0300, Antoniu Miclaus wrote:
> Add devicetree bindings for ad458x DAS family.

typo: ad485x

Subject too.

> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
> ---
>  .../bindings/iio/adc/adi,ad485x.yaml          | 82 +++++++++++++++++++
>  1 file changed, 82 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml
> new file mode 100644
> index 000000000000..5f5bdfa9522b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml
> @@ -0,0 +1,82 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2022 Analog Devices Inc.

It's 2024

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/adi,ad485x.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD485X DAS family device driver

What's DAS?

This is a binding, not 'device driver'. Just drop.

> +
> +maintainers:
> +  - Sergiu Cuciurean <sergiu.cuciurean@analog.com>
> +  - Dragos Bogdan <dragos.bogdan@analog.com>
> +  - Antoniu Miclaus <antoniu.miclaus@analog.com>
> +
> +description: |
> +  Analog Devices AD485X DAS family
> +
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad4858.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad4858
> +      - adi,ad4857
> +      - adi,ad4856
> +      - adi,ad4855
> +      - adi,ad4854
> +      - adi,ad4853
> +      - adi,ad4852
> +      - adi,ad4851
> +      - adi,ad4858i
> +
> +  reg:
> +    maxItems: 1
> +
> +  vcc-supply: true
> +
> +  vdd-supply: true
> +
> +  vddh-supply: true
> +
> +  vio-supply: true
> +
> +  pwms:
> +    maxItems: 1
> +
> +  io-backends:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 100000000
> +
> +required:
> +  - compatible
> +  - reg
> +  - vcc-supply
> +  - vdd-supply
> +  - vddh-supply
> +  - vio-supply
> +  - pwms
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        adc@0{
> +            compatible = "adi,ad4858";
> +            reg = <0>;
> +            spi-max-frequency = <10000000>;
> +            vcc-supply = <&vcc>;
> +            vdd-supply = <&vdd>;
> +            vddh-supply = <&vddh>;
> +            vio-supply = <&vio>;
> +            pwms = <&pwm_gen 0 0>;
> +            io-backends = <&iio_backend>;
> +        };
> +    };
> +...
> -- 
> 2.46.0
>
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml
new file mode 100644
index 000000000000..5f5bdfa9522b
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad485x.yaml
@@ -0,0 +1,82 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2022 Analog Devices Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad485x.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD485X DAS family device driver
+
+maintainers:
+  - Sergiu Cuciurean <sergiu.cuciurean@analog.com>
+  - Dragos Bogdan <dragos.bogdan@analog.com>
+  - Antoniu Miclaus <antoniu.miclaus@analog.com>
+
+description: |
+  Analog Devices AD485X DAS family
+
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad4858.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad4858
+      - adi,ad4857
+      - adi,ad4856
+      - adi,ad4855
+      - adi,ad4854
+      - adi,ad4853
+      - adi,ad4852
+      - adi,ad4851
+      - adi,ad4858i
+
+  reg:
+    maxItems: 1
+
+  vcc-supply: true
+
+  vdd-supply: true
+
+  vddh-supply: true
+
+  vio-supply: true
+
+  pwms:
+    maxItems: 1
+
+  io-backends:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 100000000
+
+required:
+  - compatible
+  - reg
+  - vcc-supply
+  - vdd-supply
+  - vddh-supply
+  - vio-supply
+  - pwms
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0{
+            compatible = "adi,ad4858";
+            reg = <0>;
+            spi-max-frequency = <10000000>;
+            vcc-supply = <&vcc>;
+            vdd-supply = <&vdd>;
+            vddh-supply = <&vddh>;
+            vio-supply = <&vio>;
+            pwms = <&pwm_gen 0 0>;
+            io-backends = <&iio_backend>;
+        };
+    };
+...