Hi Fred,
On Tue, Feb 04, 2025 at 05:18:29PM -0600, Fred Treven wrote:
Introduce driver for Cirrus Logic Device CS40L26: A boosted haptics driver with integrated DSP and waveform memory with advanced closed loop algorithms and LRA protection.
The core CS40L26 driver is in MFD and touches the Input Force Feedback subsystem for haptics and the ASoC subsystem for audio to haptics streaming.
This patchset includes changes to the CS DSP firmware driver which fixes two bugs and introduces support for multiple coefficient files.
Fred Treven (7): firmware: cs_dsp: Fix error checking in wseq_write() firmware: cs_dsp: Check for valid num_regs in cs_dsp_wseq_multi_write() firmware: cs_dsp: Add ability to load multiple coefficient files dt-bindings: mfd: cirrus,cs40l26: Support for CS40L26 mfd: cs40l26: Add support for CS40L26 core driver ASoC: cs40l26: Support I2S streaming to CS40L26 Input: cs40l26 - Add support for CS40L26 haptic driver
.../bindings/mfd/cirrus,cs40l26.yaml | 81 + MAINTAINERS | 4 +- drivers/firmware/cirrus/cs_dsp.c | 70 +- drivers/input/misc/Kconfig | 10 + drivers/input/misc/Makefile | 1 + drivers/input/misc/cs40l26-vibra.c | 669 ++++++++ drivers/mfd/Kconfig | 29 + drivers/mfd/Makefile | 4 + drivers/mfd/cs40l26-core.c | 1412 +++++++++++++++++ drivers/mfd/cs40l26-i2c.c | 63 + drivers/mfd/cs40l26-spi.c | 63 + include/linux/firmware/cirrus/cs_dsp.h | 14 + include/linux/mfd/cs40l26.h | 341 ++++ sound/soc/codecs/Kconfig | 12 + sound/soc/codecs/Makefile | 2 + sound/soc/codecs/cs40l26-codec.c | 523 ++++++ 16 files changed, 3281 insertions(+), 17 deletions(-) create mode 100644 Documentation/devicetree/bindings/mfd/cirrus,cs40l26.yaml create mode 100644 drivers/input/misc/cs40l26-vibra.c create mode 100644 drivers/mfd/cs40l26-core.c create mode 100644 drivers/mfd/cs40l26-i2c.c create mode 100644 drivers/mfd/cs40l26-spi.c create mode 100644 include/linux/mfd/cs40l26.h create mode 100644 sound/soc/codecs/cs40l26-codec.c
-- 2.34.1
Thank you for this high-quality series!
When the CS40L50 MFD landed last year, I (probably naively) imagined that CS40L26 and CS40L50 were close cousins. My understanding was that CS40L50 implements some basic DSP functionality in ROM, which can be overridden with firmware uploaded at runtime, while CS40L26 requires firmware to be uploaded at runtime in any circumstance.
To that end, I recall during the CS40L50 MFD review that there was some hope the CS40L50 MFD could be gently extended to support both devices, and a separate input driver may be required. At the very least, I was surprised to see an all-new codec driver, since the codec child is essentially just a stub driver in both cases.
If a completely new MFD and children are utlimately required here, then so be it; I just wanted to ask whether you had considered if it's possible to re-use and/or extend any existing driver(s) here. Assuming so, I think it can be helpful to speak to this exercise in the cover letter and explain your reasoning to the review audience.
Kind regards, Jeff LaBundy