hwmon: (lm90) Add power control
The device lm90 can be controlled by the vcc rail. Adding the regulator support to power on/off the vcc rail. Enable the "vcc" regulator before accessing the device. [JD: Rename variables to avoid confusion with registers.] Signed-off-by: NWei Ni <wni@nvidia.com> Signed-off-by: NJean Delvare <khali@linux-fr.org>
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