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iio: adc: cc10001: Add delay before setting START bit
According to hardware team there should be some delay after
setting channel number, start mode and before setting START.
Add a one microsecond delay for this purpose.
Fixes: 1664f6a5b0
("iio: adc: Cosmic Circuits 10001 ADC driver")
Signed-off-by: Naidu Tellapati <naidu.tellapati@imgtec.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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@ -100,6 +100,7 @@ static void cc10001_adc_start(struct cc10001_adc_device *adc_dev,
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val = (channel & CC10001_ADC_CH_MASK) | CC10001_ADC_MODE_SINGLE_CONV;
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cc10001_adc_write_reg(adc_dev, CC10001_ADC_CONFIG, val);
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udelay(1);
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val = cc10001_adc_read_reg(adc_dev, CC10001_ADC_CONFIG);
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val = val | CC10001_ADC_START_CONV;
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cc10001_adc_write_reg(adc_dev, CC10001_ADC_CONFIG, val);
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