diff --git a/include/dt-bindings/iio/qcom,spmi-vadc.h b/include/dt-bindings/iio/qcom,spmi-vadc.h
index 1cfd3669a665..7cfa7108a126 100644
--- a/include/dt-bindings/iio/qcom,spmi-vadc.h
+++ b/include/dt-bindings/iio/qcom,spmi-vadc.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (c) 2012-2014,2018-2020 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2012-2014,2018-2021 The Linux Foundation. All rights reserved.
  */
 
 #ifndef _DT_BINDINGS_QCOM_SPMI_VADC_H
@@ -300,4 +300,29 @@
 #define ADC7_SBUx				0x94
 #define ADC7_VBAT_2S_MID			0x96
 
+/* VADC scale function index */
+#define ADC_SCALE_DEFAULT				0
+#define ADC_SCALE_THERM_100K_PULLUP			1
+#define ADC_SCALE_PMIC_THERM				2
+#define ADC_SCALE_XOTHERM				3
+#define ADC_SCALE_PMI_CHG_TEMP				4
+#define ADC_SCALE_HW_CALIB_DEFAULT			5
+#define ADC_SCALE_HW_CALIB_THERM_100K_PULLUP		6
+#define ADC_SCALE_HW_CALIB_XOTHERM			7
+#define ADC_SCALE_HW_CALIB_THERM_100K_PU_PM7		8
+#define ADC_SCALE_HW_CALIB_PMIC_THERM			9
+#define ADC_SCALE_HW_CALIB_PMIC_THERM_PM7		10
+#define ADC_SCALE_HW_CALIB_PM5_CHG_TEMP			11
+#define ADC_SCALE_HW_CALIB_PM5_SMB_TEMP			12
+#define ADC_SCALE_HW_CALIB_BATT_THERM_100K		13
+#define ADC_SCALE_HW_CALIB_BATT_THERM_30K		14
+#define ADC_SCALE_HW_CALIB_BATT_THERM_400K		15
+#define ADC_SCALE_HW_CALIB_PM5_SMB1398_TEMP		16
+#define ADC_SCALE_HW_CALIB_PM7_SMB_TEMP			17
+#define ADC_SCALE_HW_CALIB_PM7_CHG_TEMP			18
+#define ADC_SCALE_HW_CALIB_CUR				19
+#define ADC_SCALE_HW_CALIB_CUR_RAW			20
+#define ADC_SCALE_HW_CALIB_PM2250_S3_DIE_TEMP		21
+#define ADC_SCALE_HW_CALIB_PM5_CUR			22
+
 #endif /* _DT_BINDINGS_QCOM_SPMI_VADC_H */