hwmon: (pmbus/max20830): add VOUT feedback resistor scaling support

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Implement support for external voltage divider scaling using the
adi,vout-rfb1-ohms and adi,vout-rfb2-ohms device tree properties.

When the desired output voltage exceeds VREF, a resistor divider
(RFB1 and RFB2) is used to scale down the feedback voltage. The
driver reads these resistor values from device tree and applies
the scaling formula: VOUT_actual = VOUT_measured × (1 + RFB1/RFB2)

The properties are optional. If not specified, the driver assumes
no voltage divider is present and reports the raw VOUT reading.

Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
Link: https://lore.kernel.org/r/20260730-dev-max20830c-v5-2-a7553f84ee74@analog.com
[groeck: Fixed minor conflicts]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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Alexis Czezar Torreno 2026-07-30 09:03:34 +08:00 • committed by Guenter Roeck

parent b8efcfca43

commit fdd78852b0

1 changed files with 64 additions and 1 deletions

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drivers/hwmon/pmbus/max20830.c

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