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Diffstat (limited to '')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-iio-dfsdm-adc-stm32 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-dfsdm-adc-stm32 b/Documentation/ABI/testing/sysfs-bus-iio-dfsdm-adc-stm32 new file mode 100644 index 000000000..91439d6d6 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-iio-dfsdm-adc-stm32 @@ -0,0 +1,22 @@ +What: /sys/bus/iio/devices/iio:deviceX/in_voltage_spi_clk_freq +KernelVersion: 4.14 +Contact: arnaud.pouliquen@st.com +Description: + For audio purpose only. + + Used by audio driver to set/get the spi input frequency. + + This is mandatory if DFSDM is slave on SPI bus, to + provide information on the SPI clock frequency during runtime + Notice that the SPI frequency should be a multiple of sample + frequency to ensure the precision. + + if DFSDM input is SPI master: + + Reading SPI clkout frequency, + error on writing + + If DFSDM input is SPI Slave: + + Reading returns value previously set. + Writing value before starting conversions. |