staging:iio:adc:ad7280a: rename _read() to _read_reg()

This avoids possible confusion with read back of the channel conversions.
These two types of reads are of difference sizes with resulting differences
in the data layout of the response from the hardware.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Link: https://lore.kernel.org/r/20220206190328.333093-4-jic23@kernel.org

drivers/staging/iio/adc/ad7280a.c

@@ -224,8 +224,8 @@ static int ad7280_write(struct ad7280_state *st, unsigned int devaddr,
 	return spi_write(st->spi, &st->buf[0], 4);
 }
 
-static int ad7280_read(struct ad7280_state *st, unsigned int devaddr,
-		       unsigned int addr)
+static int ad7280_read_reg(struct ad7280_state *st, unsigned int devaddr,
+			   unsigned int addr)
 {
 	int ret;
 	unsigned int tmp;
@@ -476,8 +476,8 @@ static ssize_t ad7280_show_balance_timer(struct device *dev,
 	unsigned int msecs;
 
 	mutex_lock(&st->lock);
-	ret = ad7280_read(st, this_attr->address >> 8,
-			  this_attr->address & 0xFF);
+	ret = ad7280_read_reg(st, this_attr->address >> 8,
+			      this_attr->address & 0xFF);
 	mutex_unlock(&st->lock);
 
 	if (ret < 0)