[PATCH v4 0/8] i2c: rtl9300: support for RTL9607C I2C controller

[Rustam Adilov <adilov@disroot.org>]

This patch series for the RTL9300 I2C driver adds i2c support for
RTL9607C SoC. They are somewhat different to the RTL9300 and
RTL9310 but not enough to warrant a new whole driver.

The patch series was split into patches that add/change something in the
driver to smooth out the RTL9607C support addition in the end and for
ease of review. Because of that, the patch 8 depends on all the prior
patches before it.

RTL9607C primarly uses the i2c controller for communication with laser
driver over on i2c interface 1 or 2.

I have successfully tested the byte read operations on my RTL9607C board
which has GN25L95 laser driver in OpenWrt.

This patch series now depends on the patch [1] from Jan Kantert.

[1] -
https://lore.kernel.org/all/20260227111134.2163701-1-jan-kernel@kantert.net/

---
Changelog in v4
- moved the patch 7 that changes bindings to be before patch 5 where clk
  is introduced in the driver.
- changed the "realtek,rtl9607-i2c" compatible to require the "clocks" to
  be specified and with it moved it out of "realtek,rtl9310-i2c" check to its
  own place for cleanliness (how it was originally in v1).
- Link to v3: https://lore.kernel.org/linux-i2c/20260322123411.32102-1-adilov@disroot.org/

Changelog in v3
- Patch 7
  - reworded the commit message to better describe i2c clock.
  - make clocks property available for all compatibles.
  - change "realtek,rtl9607-i2c" compatible to be under the same if statement
    as "realtek,rtl9310-i2c" for "realtek,scl".
- Link to v2: https://lore.kernel.org/linux-i2c/20260319175753.32338-1-adilov@disroot.org/

Changelog in v2
- rebased on top of the patch from Jan Kantert.
- Patch 7 (to my best understanding of Krzysztof's request):
 - added the "clocks: false" for compatibles that are not realtek,rtl9607-i2c.
- Link to v1: https://lore.kernel.org/linux-i2c/20260314082628.25206-1-adilov@disroot.org/

---
Rustam Adilov (8):
  i2c: rtl9300: split data_reg into read and write reg
  i2c: rtl9300: introduce max length property to driver data
  i2c: rtl9300: introduce F_BUSY to the reg_fields struct
  i2c: rtl9300: introduce a property for 8 bit width reg address
  dt-bindings: i2c: realtek,rtl9301-i2c: extend for clocks and RTL9607C
    support
  i2c: rtl9300: introduce clk struct for upcoming rtl9607 support
  i2c: rtl9300: intoduce new function properties to driver data
  i2c: rtl9300: add RTL9607C i2c controller support

 .../bindings/i2c/realtek,rtl9301-i2c.yaml     |  15 ++
 drivers/i2c/busses/i2c-rtl9300.c              | 191 ++++++++++++++----
 2 files changed, 171 insertions(+), 35 deletions(-)

-- 
2.53.0