[PATCH v2 0/8] i2c: rtl9300: support for RTL9607C I2C controller

Rustam Adilov
2026-03-19T17:59:19Z

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 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
i2c: rtl9300: introduce clk struct for upcoming rtl9607 support
i2c: rtl9300: intoduce new function properties to driver data
dt-bindings: i2c: realtek,rtl9301-i2c: extend for RTL9607C support
i2c: rtl9300: add RTL9607C i2c controller support

.../bindings/i2c/realtek,rtl9301-i2c.yaml | 18 ++
drivers/i2c/busses/i2c-rtl9300.c | 191 ++++++++++++++----
2 files changed, 174 insertions(+), 35 deletions(-)

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2.53.0