This is a resend of v5 which was not fully sent first time for some unknown
reason.
Extend the mma8452 driver with support for configuration of the
interrupt line in open-drain mode, which is needed for hardware designs
where the interrupt line is shared with other chips.
Adding drive-open-drain property to mma8452 device-tree node for such
designs to enable switching pin configuration to open-drain mode.
Signed-off-by: Esben Haabendal <esben@geanix.com>
---
Changes in v5:
- Squashed dev_err_probe() call to one line.
- Fixed typo in patch 2 title.
- Added synchronization between runtime suspend and interrupt handler.
- Link to v4: https://patch.msgid.link/20260812-mma8452-open-drain-v4-0-bfca15d02b59@geanix.com
Changes in v4:
- Fixed interrupt handler to check runtime PM status before trying to
access the chip.
- Split open-drain support and interrupt sharing into separate patches.
- Added new patch to reuse existing struct device * through mma8452_probe()
function.
- Print warning message when irq type is not set by firmware.
- Link to v3: https://patch.msgid.link/20260805-mma8452-open-drain-v3-0-6149f406a409@geanix.com
Changes in v3:
- Reordered patches, swapping #2 and #3.
- Always add IRQF_SHARED flag.
- New patch to change it so IQRF_TRIGGER_LOW flag is only added when no
trigger type is set by firmware.
- Link to v2: https://patch.msgid.link/20260715-mma8452-open-drain-v2-0-95be9f5f4795@geanix.com
Changes in v2:
- Commit message of patch 2 updated.
- Operator precedence bug fixed in flags argument to
request_threaded_irq().
- Always check return value of mma8452_set_interrupt_pin_mode(), and just
check for non-zero value.
- Added new patch with optimization of struct mma8452_data ordering.
- Link to v1: https://patch.msgid.link/20260715-mma8452-open-drain-v1-0-b1dd2a440c60@geanix.com
To: Jonathan Cameron <jic23@kernel.org>
To: Lars-Peter Clausen <lars@metafoo.de>
To: Rob Herring <robh@kernel.org>
To: Krzysztof Kozlowski <krzk+dt@kernel.org>
To: Conor Dooley <conor+dt@kernel.org>
To: Martin Kepplinger <martink@posteo.de>
To: Sean Nyekjaer <sean@geanix.com>
To: David Lechner <dlechner@baylibre.com>
To: Nuno Sá <nuno.sa@analog.com>
To: Andy Shevchenko <andy@kernel.org>
To: Martin Kepplinger <martin.kepplinger@theobroma-systems.com>
Cc: linux-iio@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
Esben Haabendal (6):
dt-bindings: iio: accel: mma8452: Add drive-open-drain
iio: accel: mma8452: Optimize struct mma8452_data member orders
iio: accel: mma8452: Only apply trigger type when not set by firmware
iio: accel: mma8452: Support interrupt sharing
iio: accel: mma8452: Allow open drain interrupt pin configuration
iio: accel: mma8452: Reuse existing dev pointer in mma8452_probe()
.../devicetree/bindings/iio/accel/fsl,mma8452.yaml | 6 ++
drivers/iio/accel/mma8452.c | 98 ++++++++++++++++------
2 files changed, 80 insertions(+), 24 deletions(-)
---
base-commit: db2ddb87143519e20a95aa36c60b36107b736a58
change-id: 20250401-mma8452-open-drain-81577c41375c
Best regards,
--
Esben Haabendal <esben@geanix.com>