linux-kernel - [PATCH v2 0/5] iio: ad3552r-hs: add support for internal ramp generator

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Message-Id: <20250331-wip-bl-ad3552r-fixes-v2-0-cdedb430497e@baylibre.com>
Date: Mon, 31 Mar 2025 21:02:43 +0200
From: Angelo Dureghello <adureghello@...libre.com>
To: Nuno Sá <nuno.sa@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>, 
 Jonathan Corbet <corbet@....net>, 
 Olivier Moysan <olivier.moysan@...s.st.com>, 
 Michael Hennerich <Michael.Hennerich@...log.com>
Cc: linux-iio@...r.kernel.org, linux-doc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH v2 0/5] iio: ad3552r-hs: add support for internal ramp
 generator

Add support to enable the HDL IP core internal ramp generator,
actually managed by the adi-axi-dac backend. 

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@...libre.com>
---
Changes in v2:
- doc, add few words for generic spi driver version,
- axi-dac, add a separate patch to check cntrl chan validity,
- axi-dac, return EIO on a wrong source on get, 
- add a lock on debugfs file access,
- use const strings and strlen on file access.
- Link to v1: https://lore.kernel.org/r/20250321-wip-bl-ad3552r-fixes-v1-0-3c1aa249d163@baylibre.com

---
Angelo Dureghello (5):
      iio: dac: adi-axi-dac: add cntrl chan check
      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      |  72 ++++++++++++++++++++++
 Documentation/iio/index.rst        |   1 +
 MAINTAINERS                        |   1 +
 drivers/iio/dac/ad3552r-hs.c       | 122 +++++++++++++++++++++++++++++++++++--
 drivers/iio/dac/adi-axi-dac.c      |  54 ++++++++++++++++
 drivers/iio/industrialio-backend.c |  28 +++++++++
 include/linux/iio/backend.h        |   5 ++
 7 files changed, 277 insertions(+), 6 deletions(-)
---
base-commit: eb870a5af7db1e5ca59330875125230b28e630f9
change-id: 20250321-wip-bl-ad3552r-fixes-4a386944c170

Best regards,
-- 
Angelo Dureghello <adureghello@...libre.com>