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| author |   Olivier Moysan <olivier.moysan@foss.st.com> | 2022-10-12 16:21:58 +0200 |
|---|---|---|
| committer |   Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-10-17 08:51:26 +0100 |
| commit | 174dac5dc800e4e2e4552baf6340846a344d01a3 (patch) | |
| tree | 39ba19c7a94bc05de36fc0b7a0dd70e5821dc49e /drivers/iio | |
| parent | iio: adc: mcp3911: mask out device ID in debug prints (diff) | |
| download | linux-dev-174dac5dc800e4e2e4552baf6340846a344d01a3.tar.xz linux-dev-174dac5dc800e4e2e4552baf6340846a344d01a3.zip | |
iio: adc: stm32-adc: fix channel sampling time init
Fix channel init for ADC generic channel bindings.
In generic channel initialization, stm32_adc_smpr_init() is called to
initialize channel sampling time. The "st,min-sample-time-ns" property
is an optional property. If it is not defined, stm32_adc_smpr_init() is
currently skipped.
However stm32_adc_smpr_init() must always be called, to force a minimum
sampling time for the internal channels, as the minimum sampling time is
known. Make stm32_adc_smpr_init() call unconditional.
Fixes: 796e5d0b1e9b ("iio: adc: stm32-adc: use generic binding for sample-time")
Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20221012142205.13041-2-olivier.moysan@foss.st.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/adc/stm32-adc.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c index 6256977eb7f7..3cda529f081d 100644 --- a/drivers/iio/adc/stm32-adc.c +++ b/drivers/iio/adc/stm32-adc.c @@ -2086,18 +2086,19 @@ static int stm32_adc_generic_chan_init(struct iio_dev *indio_dev, stm32_adc_chan_init_one(indio_dev, &channels[scan_index], val, vin[1], scan_index, differential); + val = 0; ret = fwnode_property_read_u32(child, "st,min-sample-time-ns", &val); /* st,min-sample-time-ns is optional */ - if (!ret) { - stm32_adc_smpr_init(adc, channels[scan_index].channel, val); - if (differential) - stm32_adc_smpr_init(adc, vin[1], val); - } else if (ret != -EINVAL) { + if (ret && ret != -EINVAL) { dev_err(&indio_dev->dev, "Invalid st,min-sample-time-ns property %d\n", ret); goto err; } + stm32_adc_smpr_init(adc, channels[scan_index].channel, val); + if (differential) + stm32_adc_smpr_init(adc, vin[1], val); + scan_index++; } |