iio: adc: qcom-vadc-common: fix vadc_scale_fn_type kernel-doc

Fix multiple warnings in enum vadc_scale_fn_type by adding a leading
'@' to the kernel-doc descriptions.

Fixed 14 warnings in this one enum, such as:
Warning: include/linux/iio/adc/qcom-vadc-common.h:123 Enum value
'SCALE_DEFAULT' not described in enum 'vadc_scale_fn_type'
Warning: ../include/linux/iio/adc/qcom-vadc-common.h:123 Enum value
'SCALE_THERM_100K_PULLUP' not described in enum 'vadc_scale_fn_type'
Warning: ../include/linux/iio/adc/qcom-vadc-common.h:123 Enum value
'SCALE_PMIC_THERM' not described in enum 'vadc_scale_fn_type'

Also prevent the warning on SCALE_HW_CALIB_INVALID by marking it
"private:" so that kernel-doc notation is not needed for it.

This leaves only one warning here, which I don't know the
appropriate description of:
qcom-vadc-common.h:125: warning: Enum value
'SCALE_HW_CALIB_PMIC_THERM_PM7' not described in enum 'vadc_scale_fn_type'

Signed-off-by: Randy Dunlap <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

include/linux/iio/adc/qcom-vadc-common.h

···
 /**
  * enum vadc_scale_fn_type - Scaling function to convert ADC code to
  *				physical scaled units for the channel.
- * SCALE_DEFAULT: Default scaling to convert raw adc code to voltage (uV).
- * SCALE_THERM_100K_PULLUP: Returns temperature in millidegC.
+ * @SCALE_DEFAULT: Default scaling to convert raw adc code to voltage (uV).
+ * @SCALE_THERM_100K_PULLUP: Returns temperature in millidegC.
  *				 Uses a mapping table with 100K pullup.
- * SCALE_PMIC_THERM: Returns result in milli degree's Centigrade.
- * SCALE_XOTHERM: Returns XO thermistor voltage in millidegC.
- * SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp
- * SCALE_HW_CALIB_DEFAULT: Default scaling to convert raw adc code to
+ * @SCALE_PMIC_THERM: Returns result in milli degree's Centigrade.
+ * @SCALE_XOTHERM: Returns XO thermistor voltage in millidegC.
+ * @SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp
+ * @SCALE_HW_CALIB_DEFAULT: Default scaling to convert raw adc code to
  *	voltage (uV) with hardware applied offset/slope values to adc code.
- * SCALE_HW_CALIB_THERM_100K_PULLUP: Returns temperature in millidegC using
+ * @SCALE_HW_CALIB_THERM_100K_PULLUP: Returns temperature in millidegC using
  *	lookup table. The hardware applies offset/slope to adc code.
- * SCALE_HW_CALIB_XOTHERM: Returns XO thermistor voltage in millidegC using
+ * @SCALE_HW_CALIB_XOTHERM: Returns XO thermistor voltage in millidegC using
  *	100k pullup. The hardware applies offset/slope to adc code.
- * SCALE_HW_CALIB_THERM_100K_PU_PM7: Returns temperature in millidegC using
+ * @SCALE_HW_CALIB_THERM_100K_PU_PM7: Returns temperature in millidegC using
  *	lookup table for PMIC7. The hardware applies offset/slope to adc code.
- * SCALE_HW_CALIB_PMIC_THERM: Returns result in milli degree's Centigrade.
+ * @SCALE_HW_CALIB_PMIC_THERM: Returns result in milli degree's Centigrade.
  *	The hardware applies offset/slope to adc code.
- * SCALE_HW_CALIB_PMIC_THERM: Returns result in milli degree's Centigrade.
+ * @SCALE_HW_CALIB_PMIC_THERM: Returns result in milli degree's Centigrade.
  *	The hardware applies offset/slope to adc code. This is for PMIC7.
- * SCALE_HW_CALIB_PM5_CHG_TEMP: Returns result in millidegrees for PMIC5
+ * @SCALE_HW_CALIB_PM5_CHG_TEMP: Returns result in millidegrees for PMIC5
  *	charger temperature.
- * SCALE_HW_CALIB_PM5_SMB_TEMP: Returns result in millidegrees for PMIC5
+ * @SCALE_HW_CALIB_PM5_SMB_TEMP: Returns result in millidegrees for PMIC5
  *	SMB1390 temperature.
  */
 enum vadc_scale_fn_type {
···
 	SCALE_HW_CALIB_PMIC_THERM_PM7,
 	SCALE_HW_CALIB_PM5_CHG_TEMP,
 	SCALE_HW_CALIB_PM5_SMB_TEMP,
+	/* private: */
 	SCALE_HW_CALIB_INVALID,
 };