What: /sys/bus/iio/devices/iio:deviceX/in_voltage_spi_clk_freq
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KernelVersion: 4.14
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Contact: arnaud.pouliquen@st.com
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Description:
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For audio purpose only.
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Used by audio driver to set/get the spi input frequency.
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This is mandatory if DFSDM is slave on SPI bus, to
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provide information on the SPI clock frequency during runtime
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Notice that the SPI frequency should be a multiple of sample
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frequency to ensure the precision.
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if DFSDM input is SPI master:
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Reading SPI clkout frequency,
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error on writing
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If DFSDM input is SPI Slave:
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Reading returns value previously set.
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Writing value before starting conversions.
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