On Mon, 19 Nov 2018, Vignesh R wrote: > When performing single ended measurements with TSCADC, its recommended > to set negative input (SEL_INM_SWC_3_0) of ADC step to ADC's VREFN in the > corresponding STEP_CONFIGx register. > Also, the positive(SEL_RFP_SWC_2_0) and negative(SEL_RFM_SWC_1_0) > reference voltage for ADC step needs to be set to VREFP and VREFN > respectively in STEP_CONFIGx register. > Without these changes, there may be variation of as much as ~2% in the > ADC's digital output which is bad for precise measurement. > > Signed-off-by: Vignesh R <vigneshr@xxxxxx> > --- > drivers/iio/adc/ti_am335x_adc.c | 5 ++++- > include/linux/mfd/ti_am335x_tscadc.h | 4 ++++ Acked-by: Lee Jones <lee.jones@xxxxxxxxxx> -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog
