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iio: adc: rockchip_saradc: Just get referenced voltage once at probe

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The referenced voltage is not changed after initiation, so just only
get referenced voltage once.

Change-Id: I1eeab03f68855fafe010db328ec7bbcfa7d52310
Signed-off-by: David Wu <david.wu@rock-chips.com>
This commit is contained in:
David Wu
2019-01-07 18:01:06 +08:00
committed by Tao Huang
parent 5c9731114e
commit b24c62307b
1 changed files with 9 additions and 8 deletions
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17
drivers/iio/adc/rockchip_saradc.c
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@@ -55,6 +55,7 @@ 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;
@@ -65,7 +66,6 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev,
int *val, int *val2, long mask)
{
struct rockchip_saradc *info = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
@@ -93,13 +93,7 @@ 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 = info->data->num_bits;
return IIO_VAL_FRACTIONAL_LOG2;
default:
@@ -298,6 +292,13 @@ 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;
goto err_reg_voltage;
}
ret = clk_prepare_enable(info->pclk);
if (ret < 0) {
dev_err(&pdev->dev, "failed to enable pclk\n");