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. Please find bellow basic examples, using this driver to: - generate DC voltage output on channel1 - generate a triangle waveform on channel2 # set max DC voltage / enable / min DC voltage / disable on out1: cd /sys/bus/iio/devices/iio\:device0 echo 4095 > out_voltage1_raw echo 1 > out_voltage1_powerdown echo 0 > out_voltage1_raw echo 0 > out_voltage1_powerdown cat out_voltage_powerdown_mode_available Hi-Z enable # configure timer trigger, and set triangle waveform with half # amplitude and DC offset on out2: cd /sys/bus/iio/devices/trigger9 cat name tim2_trgo echo 10000 > sampling_frequency cd /sys/bus/iio/devices/iio\:device1 echo triangle > out_voltage2_wavetype echo 2047 > out_voltage2_amplitude echo 1024 > out_voltage2_offset echo tim2_trgo > trigger/current_trigger echo 1 > out_voltage2_powerdown --- 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 (5): dt-bindings: iio: stm32-dac: Add support for STM32 DAC iio: dac: add support for stm32 DAC iio: trigger: add set_trigger callback to notify device iio: dac: stm32: add support for trigger events iio: dac: stm32: add support for waveform generator Documentation/ABI/testing/sysfs-bus-iio-dac-stm32 | 16 + .../devicetree/bindings/iio/dac/st,stm32-dac.txt | 61 ++ drivers/iio/dac/Kconfig | 18 + drivers/iio/dac/Makefile | 2 + drivers/iio/dac/stm32-dac-core.c | 180 ++++++ drivers/iio/dac/stm32-dac-core.h | 63 ++ drivers/iio/dac/stm32-dac.c | 631 +++++++++++++++++++++ drivers/iio/industrialio-trigger.c | 6 + include/linux/iio/iio.h | 2 + 9 files changed, 979 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-dac-stm32 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
