hwmon: (pwm-fan) Add fan speed register support
Some platforms include a fan-speed register that reports RPM directly
as an alternative to counting interrupts from the fan tachometer input.
Add support for reading a register at a given offset (rpm-offset) within
a block declared in another node (rpm-regmap). This indirection allows
the usual address mapping to be performed, and for address sharing with
another driver.
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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