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The device powers up in I2C mode. Switching to SPI mode requires sending a sequence of SPI writes as described in the datasheet. During this sequence, the device may still be in I2C mode, so SPI transactions may not be recognized and can fail. Such errors are therefore ignored. Add a comment to clarify this behavior. Datasheet: https://www.analog.com/en/products/adt7316.html Reviewed-by: Maxwell Doose <m32285159@gmail.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com> Signed-off-by: Hungyu Lin <dennylin0707@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>