1*4882a593SmuzhiyunWhat: /sys/bus/iio/devices/iio:deviceX/in_voltage_spi_clk_freq 2*4882a593SmuzhiyunKernelVersion: 4.14 3*4882a593SmuzhiyunContact: arnaud.pouliquen@st.com 4*4882a593SmuzhiyunDescription: 5*4882a593Smuzhiyun For audio purpose only. 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun Used by audio driver to set/get the spi input frequency. 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun This is mandatory if DFSDM is slave on SPI bus, to 10*4882a593Smuzhiyun provide information on the SPI clock frequency during runtime 11*4882a593Smuzhiyun Notice that the SPI frequency should be a multiple of sample 12*4882a593Smuzhiyun frequency to ensure the precision. 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun if DFSDM input is SPI master: 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun Reading SPI clkout frequency, 17*4882a593Smuzhiyun error on writing 18*4882a593Smuzhiyun 19*4882a593Smuzhiyun If DFSDM input is SPI Slave: 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun Reading returns value previously set. 22*4882a593Smuzhiyun Writing value before starting conversions. 23