This patchset adds support for the STM32H7 DAC controller It's a 12-bit, voltage output digital-to-analog converter. It has two output channels, each with its own converter, trigger sources and waveform generator. Each channel can be used independently, so common resources are managed in stm32-dac-core driver (e.g. clock, reset, regulator, registers). One IIO device is instantiated per DAC output channel, in stm32-dac driver, so each channel can have its own trigger. Examples, using this driver to generate DC voltage output on channel1: # set max DC voltage / enable / min DC voltage / disable on out1 cd /sys/bus/iio/devices/iio\:device0 echo 4095 > out_voltage1_raw echo 0 > out_voltage1_powerdown echo 0 > out_voltage1_raw echo 1 > out_voltage1_powerdown cat out_voltage_powerdown_mode_available three_state --- Changes in v3: - Fix powerdown mode, use 'three_state' as documented in sysfs-bus-iio - For now, drop support for triggers & waveform generator that requires more work. This needs to be discussed more deeply. Changes in v2: - Update dt binding, use 'reg' property to select channel - Use 'powerdown' attribute instead of 'enable' - Added set_trigger callback - Use 'offset' attribute in waveform generation mode to add DC offset - rework ABI for waveform generation mode - Various typos, comments Fabrice Gasnier (2): dt-bindings: iio: stm32-dac: Add support for STM32 DAC iio: dac: add support for stm32 DAC .../devicetree/bindings/iio/dac/st,stm32-dac.txt | 61 ++++ drivers/iio/dac/Kconfig | 15 + drivers/iio/dac/Makefile | 2 + drivers/iio/dac/stm32-dac-core.c | 180 +++++++++++ drivers/iio/dac/stm32-dac-core.h | 51 ++++ drivers/iio/dac/stm32-dac.c | 334 +++++++++++++++++++++ 6 files changed, 643 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/dac/st,stm32-dac.txt create mode 100644 drivers/iio/dac/stm32-dac-core.c create mode 100644 drivers/iio/dac/stm32-dac-core.h create mode 100644 drivers/iio/dac/stm32-dac.c -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
