Typically, the r0 (calibration data) and temperature were measured in the factory.
This information is written into the non-volatile area
where keeps data whether factory reset or OS update.
Signed-off-by: Shuming Fan <shumingf@realtek.com>
Link: https://lore.kernel.org/r/20191016115617.23213-1-shumingf@realtek.comSigned-off-by: Mark Brown <broonie@kernel.org>