Optimize the scan index for the differential channels. Before, it
was single channel count + index of the first single channel
number of the differential pair. (e.g. 11+0, +2, +4, etc.)
Divide that number by two (since it's always even), and add it up
as a scan index to have consecutive numbered channels in the
index.

Signed-off-by: Eugen Hristev <eugen.hris...@microchip.com>
---
 drivers/iio/adc/at91-sama5d2_adc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c 
b/drivers/iio/adc/at91-sama5d2_adc.c
index 7b9febc..9610393 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -209,7 +209,7 @@
                .channel = num,                                         \
                .channel2 = num2,                                       \
                .address = addr,                                        \
-               .scan_index = num + AT91_SAMA5D2_SINGLE_CHAN_CNT,       \
+               .scan_index = (num >> 1) + AT91_SAMA5D2_SINGLE_CHAN_CNT,\
                .scan_type = {                                          \
                        .sign = 's',                                    \
                        .realbits = 12,                                 \
-- 
2.7.4

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