diff options
| author | Arnaud Pouliquen | 2018-01-10 11:13:12 +0100 |
|---|---|---|
| committer | Mark Brown | 2018-01-10 10:30:13 +0000 |
| commit | eca949800d2dd761bc0c73b793e4e9ad4a997469 (patch) | |
| tree | beffb0b4fbe0a619b77ea4ad2aa401d73e5dd829 /Documentation/ABI/testing/sysfs-bus-iio-dfsdm-adc-stm32 | |
| parent | e2e6771c646251657fafb2a78db566d5c2c70635 (diff) | |
IIO: ADC: add stm32 DFSDM support for PDM microphone
This code offers a way to handle PDM audio microphones in
ASOC framework. Audio driver should use consumer API.
A specific management is implemented for DMA, with a
callback, to allows to handle audio buffers efficiently.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-bus-iio-dfsdm-adc-stm32')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-iio-dfsdm-adc-stm32 | 16 |
1 files changed, 16 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 000000000000..da9822309f07 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-iio-dfsdm-adc-stm32 @@ -0,0 +1,16 @@ +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.
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