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iio: adc: aspeed: clear reference voltage bits before configuring vref

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Ensures the reference voltage bits are cleared in the ADC engine
control register before configuring the voltage reference. This
avoids potential misconfigurations caused by residual bits.

Fixes: 1b5ceb55fe ("iio: adc: aspeed: Support ast2600 adc.")
Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Billy Tsai
2026-03-03 10:38:26 +08:00
committed by Jonathan Cameron
parent 2f16809417
commit 7cf2f6ed8e
1 changed files with 1 additions and 0 deletions
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drivers/iio/adc/aspeed_adc.c
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@@ -415,6 +415,7 @@ static int aspeed_adc_vref_config(struct iio_dev *indio_dev)
}
adc_engine_control_reg_val =
readl(data->base + ASPEED_REG_ENGINE_CONTROL);
adc_engine_control_reg_val &= ~ASPEED_ADC_REF_VOLTAGE;
ret = devm_regulator_get_enable_read_voltage(data->dev, "vref");
if (ret < 0 && ret != -ENODEV)