Commit d0cf6a16 authored Mar 04, 2026 by Nuno Sá Committed by Guenter Roeck Mar 30, 2026

hwmon: (ltc4282) Add default rsense value



Instead of failing probe when the "adi,rsense-nano-ohms" firmware property
is not provided, default rsense to (NANO/MILLI), or 1 milli-Ohm. This
allows the device to probe without requiring firmware properties, which
might be useful for some high level testing.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20260304-hwmon-ltc4282-minor-improvs-v1-2-344622924d3a@analog.com


[groeck: Clarify that the default is 1 milli-Ohm. No functional change.]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

parent d782715a

drivers/hwmon/ltc4282.c

+8 −7

Original line number	Diff line number	Diff line
		@@ -1328,15 +1328,16 @@ static int ltc4282_setup(struct ltc4282_state st, struct device dev)
		if (ret)
		return ret;

		/* default to 1 milli-ohm so we can probe without FW properties */
		st->rsense = 1 * (NANO / MILLI);
		ret = device_property_read_u32(dev, "adi,rsense-nano-ohms",
		&st->rsense);
		if (ret)
		return dev_err_probe(dev, ret,
		"Failed to read adi,rsense-nano-ohms\n");
		if (!ret) {
		if (st->rsense < CENTI)
		return dev_err_probe(dev, -EINVAL,
		"adi,rsense-nano-ohms too small (< %lu)\n",
		CENTI);
		}

		/*
		* The resolution for rsense is tenths of micro (eg: 62.5 uOhm) which