iio: ti_am335x_adc: optimize memory usage

12 bit ADC data is stored in 32 bits of storage.
Change from u32 to u16 to reduce wasted memory.

Signed-off-by: Zubair Lutfullah <zubair.lutfullah@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index a952538..ebe93eb 100644 (file)
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -122,7 +122,7 @@ static int tiadc_channel_init(struct iio_dev *indio_dev, int channels)
                chan->datasheet_name = chan_name_ain[chan->channel];
                chan->scan_type.sign = 'u';
                chan->scan_type.realbits = 12;
-               chan->scan_type.storagebits = 32;
+               chan->scan_type.storagebits = 16;
        }
 
        indio_dev->channels = chan_array;
@@ -186,7 +186,7 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
                if (stepid == map_val) {
                        read = read & FIFOREAD_DATA_MASK;
                        found = true;
-                       *val = read;
+                       *val = (u16) read;
                }
        }