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dt-bindings: hwmon: (pmbus/max20830): add VOUT feedback resistor properties and complete examples

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Add adi,vout-rfb1-ohms and adi,vout-rfb2-ohms properties to support
external voltage divider configuration for VOUT sensing. When the
desired output voltage is higher than VREF, a resistor divider (RFB1
and RFB2) is required to reach the intended value.

The properties use a dependency constraint to ensure both resistors
are specified together, or neither. This prevents misconfiguration
where only one resistor value is provided.

This patch also adds missing entries in the examples.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
Link: https://lore.kernel.org/r/20260730-dev-max20830c-v5-1-a7553f84ee74@analog.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Alexis Czezar Torreno 2026-07-30 09:03:33 +08:00 committed by Guenter Roeck
parent 6d479f0f1b
commit b8efcfca43
1 changed files with 22 additions and 0 deletions
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22
Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
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@ -44,15 +44,32 @@ properties:
GPIO connected to the power-good status output pin.
maxItems: 1
adi,vout-rfb1-ohms:
description:
Top feedback resistor (RFB1) value in ohms for VOUT sensing divider.
When the desired output voltage is higher than VREF, a resistor divider
is required. VOUT = VREF × (1 + RFB1/RFB2)
adi,vout-rfb2-ohms:
description:
Bottom feedback resistor (RFB2) value in ohms for VOUT sensing divider.
Datasheet recommends that RFB2 does not exceed 2.5kΩ.
required:
- compatible
- reg
- vddh-supply
dependencies:
adi,vout-rfb1-ohms: ['adi,vout-rfb2-ohms']
adi,vout-rfb2-ohms: ['adi,vout-rfb1-ohms']
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
@ -61,6 +78,11 @@ examples:
compatible = "adi,max20830";
reg = <0x30>;
vddh-supply = <&vddh>;
avdd-supply = <&avdd>;
ldoin-supply = <&ldoin>;
pwr-good-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
adi,vout-rfb1-ohms = <10000>;
adi,vout-rfb2-ohms = <2000>;
};
};
...