iio: ti_am335x_adc: Fix: Use same step id at FIFOs both ends

commit baa3c65298c089a9014b4e523a14ec2885cca1bc upstream.

Since AI lines could be selected at will (linux-3.11) the sending
and receiving ends of the FIFO does not agree about what step is used
for a line. It only works if the last lines are used, like 5,6,7,
and fails if ie 2,4,6 is selected in DT.

Signed-off-by: Jan Kardell <jan.kardell@telliq.com>
Tested-by: Zubair Lutfullah <zubair.lutfullah@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index a952538a1a8b5be11078744f1463d45067dee567..b9ed661293a7f8b9a8d9a9cfbbe4875409e94184 100644 (file)
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -155,7 +155,7 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
                if (time_after(jiffies, timeout))
                        return -EAGAIN;
                }
-       map_val = chan->channel + TOTAL_CHANNELS;
+       map_val = adc_dev->channel_step[chan->scan_index];
 
        /*
         * When the sub-system is first enabled,