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