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hwmon: Driver for the temp/voltage sensor on PolarFire SoC

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Add a driver for the temperature and voltage sensors on PolarFire SoC.
The temperature reports how hot the die is, and the voltages are the
SoC's 1.05, 1.8 and 2.5 volt rails respectively.

The hardware supports alarms in theory, but there is an erratum that
prevents clearing them once triggered, so no support is added for them.

The hardware measures voltage with 16 bits, of which 1 is a sign bit and
the remainder holds the voltage as a fixed point integer value. It's
improbable that the hardware will work if the voltages are negative, so
the driver ignores the sign bits.

There's no dt support etc here because this is the child of a simple-mfd
syscon.

Signed-off-by: Lars Randers <lranders@mail.dk>
Co-developed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20260629-wriggle-headscarf-c85a4070dddb@spud
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Lars Randers 2026-06-29 10:30:59 +01:00 • committed by Guenter Roeck
commit ecc0eb5e95
6 changed files with 459 additions and 0 deletions
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