From: Naidu Tellapati Date: Thu, 7 May 2015 21:22:20 +0000 (-0300) Subject: iio: adc: cc10001: Add delay before setting START bit X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f29b212edb9e253cafcb4a2ab7842a890989f1a5;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git 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: 1664f6a5b0c8 ("iio: adc: Cosmic Circuits 10001 ADC driver") Signed-off-by: Naidu Tellapati Signed-off-by: Ezequiel Garcia Cc: Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/adc/cc10001_adc.c b/drivers/iio/adc/cc10001_adc.c index fb7c5d2cc61a..115f6e99a7fa 100644 --- a/drivers/iio/adc/cc10001_adc.c +++ b/drivers/iio/adc/cc10001_adc.c @@ -100,6 +100,7 @@ static void cc10001_adc_start(struct cc10001_adc_device *adc_dev, val = (channel & CC10001_ADC_CH_MASK) | CC10001_ADC_MODE_SINGLE_CONV; cc10001_adc_write_reg(adc_dev, CC10001_ADC_CONFIG, val); + udelay(1); val = cc10001_adc_read_reg(adc_dev, CC10001_ADC_CONFIG); val = val | CC10001_ADC_START_CONV; cc10001_adc_write_reg(adc_dev, CC10001_ADC_CONFIG, val);