Add support for a variety of SolidRun RZ/G2 based SoMs and the
HummingBoard IIoT Evaluation board.

Bindings are added for all SolidRun RZ/G2 SoMs:

- RZ/G2L SYSTEM ON MODULE
  https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/rz-g2l-som/
- RZ/V2L SYSTEM ON MODULE
  https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/rz-v2l-som/
- RZ/G2LC SYSTEM ON MODULE
  https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/rz-g2lc-som/
- RZ/G2UL SYSTEM ON MODULE
  https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/rz-g2ul-som/

And each supported carrier board:

- HUMMINGBOARD RZ/G2L IIOT
  https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/hummingboard-rz-series-sbcs/hummingboard-rz-g2l-iot-sbc/
- HUMMINGBOARD RZ/G2L PRO
  https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/hummingboard-rz-series-sbcs/hummingboard-rz-g2l-sbc/
- HUMMINGBOARD RZ/G2LC BASE (Ripple)
  https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/hummingboard-rz-series-sbcs/hummingboard-rz-g2lc-base/

Device-tree are only added for the first board to reduce initial effort.

Signed-off-by: Josua Mayer <josua@solid-run.com>
---
Changes in v3:
- Added explanatory comments on won't-fix sashiko findings.
- Added cap-sdio-irq to sdhi controllers used for WiFi.
- Drop redundant addition of common device-tree overlays to install
  targets of G2L(C) SoC.
- Add common device-tree overlays to install targets of both G2L and V2L
  SoCs.
- Assign kbuild composie variables with := operator.
- Link to v2: https://lore.kernel.org/r/20260511-rzg2-sr-boards-v2-0-82aebbd27891@solid-run.com

Changes in v2:
- Added relevant product page links to each commit description.
- Added product page links to cover letter, thanks Geert.
- Link to v1: https://lore.kernel.org/r/20260503-rzg2-sr-boards-v1-0-8545677f93ca@solid-run.com

---
Josua Mayer (4):
      dt-bindings: soc: renesas: Add various SolidRun RZ/G2 based boards
      arm64: dts: renesas: add support for solidrun rzg2l som and hb-iiot evb
      arm64: dts: renesas: add support for solidrun rzv2l som and hb-iiot evb
      arm64: dts: renesas: add support for solidrun rzg2lc som and hb-iiot evb

 .../devicetree/bindings/soc/renesas/renesas.yaml   |  37 ++
 arch/arm64/boot/dts/renesas/Makefile               |  33 ++
 .../dts/renesas/r9a07g044c2-hummingboard-iiot.dts  |  20 +
 .../dts/renesas/r9a07g044l2-hummingboard-iiot.dts  |  16 +
 .../dts/renesas/r9a07g054l2-hummingboard-iiot.dts  |  16 +
 .../renesas/rzg2l-hummingboard-iiot-common.dtsi    | 572 +++++++++++++++++++++
 .../renesas/rzg2l-hummingboard-iiot-microsd.dtso   |  26 +
 .../renesas/rzg2l-hummingboard-iiot-rs485-a.dtso   |  17 +
 .../renesas/rzg2l-hummingboard-iiot-rs485-b.dtso   |  17 +
 .../boot/dts/renesas/rzg2l-hummingboard-iiot.dtsi  |  49 ++
 arch/arm64/boot/dts/renesas/rzg2l-sr-som-emmc.dtso |  44 ++
 arch/arm64/boot/dts/renesas/rzg2l-sr-som.dtsi      | 421 +++++++++++++++
 arch/arm64/boot/dts/renesas/rzg2lc-sr-som.dtsi     | 374 ++++++++++++++
 13 files changed, 1642 insertions(+)
---
base-commit: 254f49634ee16a731174d2ae34bc50bd5f45e731
change-id: 20260502-rzg2-sr-boards-37d556668a2d

Best regards,
-- 
Josua Mayer <josua@solid-run.com>