AD3552R driver

Device driver for Analog Devices Inc. AD35XXR series of DACs. The module name is ad3552r. With the same module name, two different driver variants are available, the generic spi variant, to be used with any classic SPI controllers, and the hs (high speed) variant, for an ADI axi-dac (IP core) based controller that allows to reach the maximum sample rate supported from the DACs, using the DMA transfer and all the SPI lines available (D/QDSPI).. The high speed driver variant is intended to be used with the adi-axi-dac backend support enabled, that is enabled by default when the driver is selected.

Supported devices

Wiring connections

Generic SPI

Use the classic SPI S_CLK/CS/SDO/SDI connection.

High speed (using axi-dac backend)

.-----------------.                .-------.
|                 |--- D/QSPI -----|       |
|   DAC IP CORE   |--- SPI S_CLK --|  DAC  |
|                 |--- SPI CS -----|       |
|                 |--- LDAC -------|       |
|                 |--- RESET ------|       |
|_________________|                |_______|

High speed features

Device attributes

The following table shows the ad35xxr related device debug files, found in the specific debugfs path /sys/kernel/debug/iio/iio:deviceX.

Debugfs device files

Description

data_source

The used data source, as normal, ramp-16bit, etc.

data_source_available

The available data sources.

Usage examples

. code-block:: bash

root:/sys/bus/iio/devices/iio:device0# cat data_source normal root:/sys/bus/iio/devices/iio:device0# echo -n ramp-16bit > data_source root:/sys/bus/iio/devices/iio:device0# cat data_source ramp-16bit