Hi Jonathan, On 30.03.2025 17:53, Jonathan Cameron wrote: > On Fri, 21 Mar 2025 21:28:47 +0100 > Angelo Dureghello <adureghello@xxxxxxxxxxxx> wrote: > > > Add support to enable the HDL IP core internal ramp generator, > > actually managed by the adi-axi-dac backend. > > What is it for? Circuit testing or something else? > We have in the past had pattern generators in IIO (currently under > frequency drivers, though I'm not sure what we have in the way of > waveforms in the stuff outside staging) so I'd like to be sure > this is about debug rather than a pattern that is actually expected > to be useful. > Sorry form some reason seen this too late, just sent a v2. Anyway, the signal is a tooth wave at 280Hz, not sure that pattern can be of any use except for some dabug cases, or noise tests. Regards, angelo > Jonathan > > > > > It works this way: > > > > /sys/bus/iio/devices/iio:device0# echo 1 > buffer0/out_voltage0_en > > /sys/bus/iio/devices/iio:device0# echo 1 > buffer0/out_voltage1_en > > /sys/bus/iio/devices/iio:device0# echo 1 > buffer0/enable > > > > Activating ramp generator: > > > > /sys/kernel/debug/iio/iio:device0# echo -n backend-ramp-generator > data_source > > > > Deactivating: > > > > /sys/kernel/debug/iio/iio:device0# echo -n iio-buffer > data_source > > > > Signed-off-by: Angelo Dureghello <adureghello@xxxxxxxxxxxx> > > --- > > Angelo Dureghello (4): > > docs: iio: add documentation for ad3552r driver > > iio: backend: add support for data source get > > iio: dac: adi-axi-dac: add data source get > > iio: dac: ad3552r-hs: add support for internal ramp > > > > Documentation/iio/ad3552r.rst | 65 +++++++++++++++++++++++ > > Documentation/iio/index.rst | 1 + > > MAINTAINERS | 1 + > > drivers/iio/dac/ad3552r-hs.c | 106 ++++++++++++++++++++++++++++++++++--- > > drivers/iio/dac/adi-axi-dac.c | 27 ++++++++++ > > drivers/iio/industrialio-backend.c | 28 ++++++++++ > > include/linux/iio/backend.h | 5 ++ > > 7 files changed, 227 insertions(+), 6 deletions(-) > > --- > > base-commit: eb870a5af7db1e5ca59330875125230b28e630f9 > > change-id: 20250321-wip-bl-ad3552r-fixes-4a386944c170 > > > > Best regards, >
