3 files changed, 9 insertions, 0 deletions

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 6eb24dbc081e..37650a72b31f 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -397,6 +397,11 @@ static ssize_t iio_read_channel_info(struct device *dev,
                 val2 = do_div(tmp, 1000000000LL);
                 val = tmp;
                 return sprintf(buf, "%d.%09u\n", val, val2);
+        case IIO_VAL_FRACTIONAL_LOG2:
+                tmp = (s64)val * 1000000000LL >> val2;
+                val2 = do_div(tmp, 1000000000LL);
+                val = tmp;
+                return sprintf(buf, "%d.%09u\n", val, val2);
         default:
                 return 0;
         }
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 5230a33886c0..b394621d362c 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -314,6 +314,9 @@ static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan,
                 *processed = div_s64(raw64 * (s64)scale_val * scale,
                                      scale_val2);
                 break;
+        case IIO_VAL_FRACTIONAL_LOG2:
+                *processed = (raw64 * (s64)scale_val * scale) >> scale_val2;
+                break;
         default:
                 return -EINVAL;
         }
diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index 5c647ecfd5ba..87b196a2d698 100644
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -58,5 +58,6 @@ enum iio_modifier {
 #define IIO_VAL_INT_PLUS_NANO 3
 #define IIO_VAL_INT_PLUS_MICRO_DB 4
 #define IIO_VAL_FRACTIONAL 10
+#define IIO_VAL_FRACTIONAL_LOG2 11
 
 #endif /* _IIO_TYPES_H_ */