[PATCH 0/3] i2c: qcom-cci: Fix CCI clock rate enforcement

[Loic Poulain]

The CCI hw_params timing values (thigh, tlow, etc.) are expressed in
clock ticks and were calibrated for a specific CCI clock frequency per
hardware variant (19.2 MHz for v1/v1.5/msm8953, 37.5 MHz for v2).
Running at the wrong frequency causes incorrect I2C timings that may
violate the I2C specification.

A previous series removed the cci_clk_rate field and the associated
warning from the driver on the grounds that the warning was noisy and
the rate was already set via assigned-clock-rates in the DT. However,
enforcing a clock frequency configuration through DT is fragile and not
the right approach, the driver owns the hw_params and should own the
clock rate too.

This series reverts the removal of cci_clk_rate, fixes the missing rate
for the msm8953 variant (added after the field was removed), and
replaces the passive warn-only approach with an active clk_set_rate()
at probe time, retaining the warning for cases where the rate cannot be
applied.

Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxxxxxxxx>
---
Loic Poulain (3):
      Revert "i2c: qcom-cci: Remove unused struct member cci_clk_rate"
      i2c: qcom-cci: Add missing cci_clk_rate for msm8953
      i2c: qcom-cci: Fix CCI clock rate enforcement

 drivers/i2c/busses/i2c-qcom-cci.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
---
base-commit: fce2dfa773ced15f27dd27cd0b482a7473cdcf2a
change-id: 20260721-cci-clk-fix-fe145b2acfa7

Best regards,
-- 
Loic Poulain <loic.poulain@xxxxxxxxxxxxxxxx>