[PATCH v3 0/6] Ambarella CV75: bindings, RCT clocks, and DT

This is part A of a 3-part CV75 v3 split:

  A: bindings + RCT/CCU clocks + SoC/EVK DT + MAINTAINERS  (this series)
  B: pinctrl + PL061 GPIO variant
  C: 8250_dw UART quirks

B depends on A; C depends on A+B. B and C follow as separate threads.

Link to v2:
https://lore.kernel.org/r/20260806-longzhao-upstream-cv75-v2-v2-0-6b09707c5fe9@ambarella.com

Summary:
- arm / syscon / clock bindings and CV75 RCT CCU driver
- minimal CV75 SoC + EVK DT (UART0, clocks)
- MAINTAINERS entry for Ambarella

Changes since v2 (A scope):
- scratchpad as generic syscon (Krzysztof)
- RCT as dedicated clock-controller binding/header (Krzysztof)
- DT nodes under /soc with unit-address ordering (Krzysztof/Rob)
- clk robustness: div_u64 and mux/div + PLL edge cases (internal review)

Verified on CV75 with A+B+C (boot, UART, clk_summary).

Signed-off-by: Long Zhao <[email protected]>

---
Long Zhao (6):
      dt-bindings: arm: add Ambarella CV75 platforms
      dt-bindings: mfd: syscon: add Ambarella CV75 secure scratchpad
      dt-bindings: clock: add Ambarella CV75 RCT
      clk: ambarella: add CV75 CCU driver
      arm64: ambarella: add ARCH_AMBARELLA and CV75 EVK DT
      MAINTAINERS: add ARM/AMBARELLA SoC support

 .../devicetree/bindings/arm/ambarella.yaml         |  24 ++
 .../bindings/clock/ambarella,cv75-rct.yaml         |  58 ++++
 Documentation/devicetree/bindings/mfd/syscon.yaml  |   1 +
 .../devicetree/bindings/vendor-prefixes.yaml       |   2 +
 MAINTAINERS                                        |  14 +
 arch/arm64/Kconfig.platforms                       |   9 +
 arch/arm64/boot/dts/Makefile                       |   1 +
 arch/arm64/boot/dts/ambarella/Makefile             |   3 +
 arch/arm64/boot/dts/ambarella/cv75-evk.dts         |  30 ++
 arch/arm64/boot/dts/ambarella/cv75.dtsi            | 178 ++++++++++
 arch/arm64/configs/defconfig                       |   1 +
 drivers/clk/Kconfig                                |   1 +
 drivers/clk/Makefile                               |   1 +
 drivers/clk/ambarella/Kconfig                      |  13 +
 drivers/clk/ambarella/Makefile                     |   6 +
 drivers/clk/ambarella/ccu-cv75.c                   | 296 ++++++++++++++++
 drivers/clk/ambarella/ccu_common.c                 |  60 ++++
 drivers/clk/ambarella/ccu_common.h                 |  25 ++
 drivers/clk/ambarella/ccu_mux_div.c                | 231 +++++++++++++
 drivers/clk/ambarella/ccu_mux_div.h                |  35 ++
 drivers/clk/ambarella/ccu_pll.c                    | 378 +++++++++++++++++++++
 drivers/clk/ambarella/ccu_pll.h                    |  70 ++++
 include/dt-bindings/clock/ambarella,cv75-rct.h     |  15 +
 23 files changed, 1452 insertions(+)
---
base-commit: 34cf6dafc47441dfb6b356a095b89c3585a93714
change-id: 20260812-cv75-v3-a-c49121aca9a2

Best regards,
--  
Long Zhao <[email protected]>