From: David Wu <david.wu@xxxxxxxxxxxxxx>
The referenced voltage is not changed after initiation, so just only
get referenced voltage once.
Signed-off-by: Simon Xue <xxm@xxxxxxxxxxxxxx>
Signed-off-by: David Wu <david.wu@xxxxxxxxxxxxxx>
---
drivers/iio/adc/rockchip_saradc.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index f3eb8d2e50dc..cd33c0b9d3eb 100644
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -49,6 +49,7 @@ struct rockchip_saradc {
struct clk *clk;
struct completion completion;
struct regulator *vref;
+ int uv_vref;
struct reset_control *reset;
const struct rockchip_saradc_data *data;
u16 last_val;
@@ -105,13 +106,7 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev,
mutex_unlock(&indio_dev->mlock);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
- ret = regulator_get_voltage(info->vref);
- if (ret < 0) {
- dev_err(&indio_dev->dev, "failed to get voltage\n");
- return ret;
- }
-
- *val = ret / 1000;
+ *val = info->uv_vref / 1000;
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
default:
@@ -410,6 +405,13 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
return ret;
}
+ info->uv_vref = regulator_get_voltage(info->vref);
+ if (info->uv_vref < 0) {
+ dev_err(&pdev->dev, "failed to get voltage\n");
+ ret = info->uv_vref;
+ return ret;
+ }
+
ret = clk_prepare_enable(info->pclk);
if (ret < 0) {
dev_err(&pdev->dev, "failed to enable pclk\n");
--
2.25.1
