1What: /sys/bus/iio/devices/iio:deviceX/in_voltage_spi_clk_freq 2KernelVersion: 4.14 3Contact: arnaud.pouliquen@st.com 4Description: 5 For audio purpose only. 6 7 Used by audio driver to set/get the spi input frequency. 8 9 This is mandatory if DFSDM is slave on SPI bus, to 10 provide information on the SPI clock frequency during runtime 11 Notice that the SPI frequency should be a multiple of sample 12 frequency to ensure the precision. 13 14 if DFSDM input is SPI master: 15 16 Reading SPI clkout frequency, 17 error on writing 18 19 If DFSDM input is SPI Slave: 20 21 Reading returns value previously set. 22 Writing value before starting conversions. 23