2021-08-15 21:36:02

by Liam Beguin

Subject: [PATCH v6 4/5] dt-bindings: iio: adc: ad7949: update voltage reference bindings

From: Liam Beguin <[email protected]>

Update bindings to describe support for buffered and unbuffered external
voltage references selection, and add adi,internal-ref-microvolt for
internal voltage reference selection.

Signed-off-by: Liam Beguin <[email protected]>
---
.../bindings/iio/adc/adi,ad7949.yaml | 51 +++++++++++++++++--
1 file changed, 48 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7949.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7949.yaml
index 9b56bd4d5510..0b10ed5f74ae 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7949.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7949.yaml
@@ -26,19 +26,43 @@ properties:
reg:
maxItems: 1

+ vrefin-supply:
+ description:
+ Buffered ADC reference voltage supply.
+
vref-supply:
description:
- ADC reference voltage supply
+ Unbuffered ADC reference voltage supply.
+
+ adi,internal-ref-microvolt:
+ description: |
+ Internal reference voltage selection in microvolts.
+
+ If no internal reference is specified, the channel will default to the
+ external reference defined by vrefin-supply (or vref-supply).
+ vrefin-supply will take precedence over vref-supply if both are defined.
+
+ If no supplies are defined, the reference selection will default to
+ 4096mV internal reference.
+
+ enum: [2500000, 4096000]
+ default: 4096000
+

spi-max-frequency: true

- "#io-channel-cells":
+ '#io-channel-cells':
const: 1

+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
required:
- compatible
- reg
- - vref-supply

additionalProperties: false

@@ -49,9 +73,30 @@ examples:
#size-cells = <0>;

adc@0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
compatible = "adi,ad7949";
reg = <0>;
vref-supply = <&vdd_supply>;
};
+
+ adc@1 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ compatible = "adi,ad7949";
+ reg = <1>;
+ vrefin-supply = <&vdd_supply>;
+ };
+
+ adc@2 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ compatible = "adi,ad7949";
+ reg = <2>;
+ adi,internal-ref-microvolt = <4096000>;
+ };
};
...
--
2.32.0.452.g940fe202adcb

2021-08-17 22:19:59

by Rob Herring (Arm)

Subject: Re: [PATCH v6 4/5] dt-bindings: iio: adc: ad7949: update voltage reference bindings

On Sun, 15 Aug 2021 17:33:08 -0400, Liam Beguin wrote:
> From: Liam Beguin <[email protected]>
>
> Update bindings to describe support for buffered and unbuffered external
> voltage references selection, and add adi,internal-ref-microvolt for
> internal voltage reference selection.
>
> Signed-off-by: Liam Beguin <[email protected]>
> ---
> .../bindings/iio/adc/adi,ad7949.yaml | 51 +++++++++++++++++--
> 1 file changed, 48 insertions(+), 3 deletions(-)
>

Reviewed-by: Rob Herring <[email protected]>