Re: [PATCH v4 0/4] i3c: add support for the Renesas controller

Hi Wolfram,
Thanks for your series!

On Tue, Jul 22, 2025 at 09:07:42PM +0200, Wolfram Sang wrote:

Detailed changes since v3 are described in the individual patches. A
branch with enablement patches for RZ/G3S+G3E can be found here:

git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/g3s/i3c

Old coverletter:

Here is a basic driver for the I3C IP found in various Renesas SoCs like
RZ/G3S and G3E. Missing features to be added incrementally are IBI,
HotJoin and maybe target support. Other than that, this driver has been
tested with I3C pure busses (2 targets) and mixed busses (2 I3C +
various I2C targets). DAA and reading/writing to the temperature sensors
worked reliably at different speeds. Scoping the bus, the output from
the protocol analyzer seems reasonable, too. It was created by merging
two versions of it from two different BSPs. Then, improved according to
code analyzers, cleaned up with regard to coding style, and then
refactored to hopefully match I3C subsystem standards.

Looking forward to comments,

   Wolfram


Tommaso Merciai (1):
  dt-bindings: i3c: Add Renesas I3C controller

Wolfram Sang (3):
  i3c: Standardize defines for specification parameters
  i3c: Add more parameters for controllers to the header
  i3c: master: Add basic driver for the Renesas I3C controller

Tested this series on top of [1], using RZ/G3E SMARC EVK board +
SMARC BREAKOUT board connected to P3T1085UK-ARD, using i3c pure bus and
I'm able to read the i3c temperature sensor:

root@smarc-rzg3e:~# cat /sys/class/hwmon/*/temp1_input
25875

For all the series:

Tested-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>

[1] https://lkml.org/lkml/2025/6/24/581

Thanks & Regards,
Tommaso

 .../devicetree/bindings/i3c/renesas,i3c.yaml  |  179 +++
 MAINTAINERS                                   |    7 +
 drivers/i3c/master.c                          |   12 +-
 drivers/i3c/master/Kconfig                    |   10 +
 drivers/i3c/master/Makefile                   |    1 +
 drivers/i3c/master/dw-i3c-master.c            |    4 +-
 drivers/i3c/master/renesas-i3c.c              | 1404 +++++++++++++++++
 include/linux/i3c/master.h                    |   16 +-
 8 files changed, 1621 insertions(+), 12 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/i3c/renesas,i3c.yaml
 create mode 100644 drivers/i3c/master/renesas-i3c.c

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