[PATCH v2 0/3] ASoC: Add LPASS VA CSR HeartBeat pulse clock support

[Sarath Ganapathiraju via B4 Relay]

The LPASS VA CSR block contains rate generator hardware that produces
a HeartBeat Pulse (also known as RateGen Pulse). This pulse
synchronizes the start of the DMAs and Codec Interfaces for the audio
usecases and can serve as a periodic wakeup source for the DSP.

This series adds the DT binding and driver support to model this
rate generator as a clock provider, and extends the VA macro binding
with a new hawi variant that consumes the heartbeatpulse clock
alongside its existing mclk, macro, and dcodec clocks.

Patch 1 adds the YAML binding for the new qcom,hawi-lpass-va-csr
clock provider node.

Patch 2 extends qcom,lpass-va-macro to describe the new
qcom,hawi-lpass-va-macro compatible with its four-clock constraint.

Patch 3 adds the lpass-va-csr driver that registers the
lpass_heartbeat_pulse clock and enables/disables the rate generator
via regmap when the clock consumer requests it.

Signed-off-by: Sarath Ganapathiraju <sarath.ganapathiraju@xxxxxxxxxxxxxxxx>
---
Changes in v2:
- Split the DT binding patch into two: one for the new
  qcom,lpass-va-csr binding, one for the qcom,lpass-va-macro
  extension (Srinivas).
- Fixed the qcom,lpass-va-csr example so it uses a 2-cell reg
  under a proper #address-cells/#size-cells parent node, fixing
  dt_binding_check (Rob).
- Switched the heartbeatpulse clk_ops from atomic
  enable/disable/is_enabled to sleepable prepare/unprepare/is_prepared,
  since regmap with a maple tree cache is not safe to call from the
  raw spinlock context the atomic ops run under.
- Checked and propagated regmap_write()/regmap_read() return values
  instead of ignoring them.
- Used regmap_set_bits()/regmap_clear_bits()/regmap_test_bits() instead
  of manual regmap_update_bits()/regmap_read() combos (Konrad).
- Used lowercase hex for register offset defines (Konrad).
- Link to v1: https://lore.kernel.org/linux-arm-msm/20260714-master-v1-0-1ebe5993225e@xxxxxxxxxxxxxxxx/

---
Sarath Ganapathiraju (3):
      ASoC: dt-bindings: qcom,lpass-va-csr: Add HeartBeat pulse clock
      ASoC: dt-bindings: qcom,lpass-va-macro: Add hawi heartbeatpulse clock
      ASoC: Add LPASS VA CSR heartbeat pulse clock

 .../bindings/sound/qcom,lpass-va-csr.yaml          |  52 ++++++++
 .../bindings/sound/qcom,lpass-va-macro.yaml        |  18 +++
 sound/soc/codecs/Kconfig                           |  13 ++
 sound/soc/codecs/Makefile                          |   2 +
 sound/soc/codecs/lpass-va-csr.c                    | 143 +++++++++++++++++++++
 5 files changed, 228 insertions(+)
---
base-commit: 1a1757b76427f6201bfe0bf1bea9f7574f332a93
change-id: 20260714-master-ca87b5f19ae0

Best regards,
--  
Sarath Ganapathiraju <sarath.ganapathiraju@xxxxxxxxxxxxxxxx>