[PATCH v6 00/13] Ambarella CV75 SoC minimal bring-up

[Long Zhao via B4 Relay]

This series adds minimal Ambarella CV75 support for early bring-up with
a serial console: DT bindings, RCT/CCU clocks, pinctrl, PL061 GPIO via
gpio-regmap, 8250_dw UART quirks, ARCH_AMBARELLA, CV75 EVK DT, and
MAINTAINERS.

This is a single unified series. Please apply via the SoC tree;
subsystem maintainers are Cc'd for their pieces.

Verified with:
- scripts/checkpatch.pl --strict (0 errors)
- make dt_binding_check DT_SCHEMA_FILES=ambarella:pl061-gpio.yaml:syscon.yaml:snps-dw-apb-uart.yaml
- make CHECK_DTBS=y ambarella/cv75-evk.dtb
- arm64 build of new drivers/DTS
- CV75 EVK: console via 8250_dw (dw-apb-uart); GPIO edge IRQ
  (gpio-hammer / gpio-event-mon)

Signed-off-by: Long Zhao <longzhao@xxxxxxxxxxxxx>
---
Changes in v6:
- gpio: convert gpio-pl061 data path to gpio-regmap; keep PL061 irqchip
  (Andy, Linus). Add write_data_after_dir + girq helpers to gpio-regmap.
  Ambarella layout uses JEP106 periphid 0x000e8061; no AFSEL clearing in
  the GPIO driver; Ambarella skips unverified GPIO PM save/restore
- serial: restore 8250_dw Ambarella quirks from v3; drop standalone
  8250_ambarella (Andy). Commit message clarifies Ambarella IP with a
  DW-like register map needing only a thin quirk. Binding under
  snps-dw-apb-uart; DT uses ambarella,cv75-uart + snps,dw-apb-uart with
  reg-shift/reg-io-width
- clock/RCT: document #reset-cells (Krzysztof); soft-reset ID header and
  reset provider deferred (no resets= consumers in this series)
- arm64/Kconfig: do not select ARM_PSCI / HAVE_ARM_ARCH_TIMER (Sashiko)
- pinctrl: no Ambarella suspend/resume claim without validated PM

Link to v5:
https://lore.kernel.org/r/20260818-cv75-v5-v5-0-7bbb12f0360f@xxxxxxxxxxxxx
Link to v2:
https://lore.kernel.org/r/20260806-longzhao-upstream-cv75-v2-v2-0-6b09707c5fe9@xxxxxxxxxxxxx
Link to v3-A:
https://lore.kernel.org/r/20260813-cv75-v3-a-v3-0-cfdd20b1b4dd@xxxxxxxxxxxxx
Link to v3-B:
https://lore.kernel.org/r/20260813-cv75-v3-b-v3-0-1d82e18da09b@xxxxxxxxxxxxx
Link to v3-C:
https://lore.kernel.org/r/20260813-cv75-v3-c-v3-0-9352b3fd6026@xxxxxxxxxxxxx
Link to v4-B:
https://lore.kernel.org/r/20260814-cv75-v4-b-v4-0-622e63153d97@xxxxxxxxxxxxx

To: Arnd Bergmann <arnd@xxxxxxxx>
To: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
To: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
To: soc@xxxxxxxxxxxxxxx
To: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>
Cc: Conor Dooley <conor+dt@xxxxxxxxxx>
Cc: Michael Turquette <mturquette@xxxxxxxxxxxx>
Cc: Stephen Boyd <sboyd@xxxxxxxxxx>
Cc: Linus Walleij <linusw@xxxxxxxxxx>
Cc: Bartosz Golaszewski <brgl@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Jiri Slaby <jirislaby@xxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Long Zhao <zl020895@xxxxxxx>
Cc: Lee Jones <lee@xxxxxxxxxx>
Cc: mfd@xxxxxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-clk@xxxxxxxxxxxxxxx
Cc: linux-gpio@xxxxxxxxxxxxxxx
Cc: linux-serial@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx

---
Long Zhao (13):
      dt-bindings: arm: add Ambarella CV75 platforms
      dt-bindings: mfd: syscon: add Ambarella CV75 secure scratchpad
      dt-bindings: clock: add Ambarella CV75 RCT
      dt-bindings: pinctrl: add Ambarella CV75 pinctrl
      dt-bindings: gpio: pl061: add Ambarella CV75 variant
      dt-bindings: serial: snps-dw-apb-uart: add ambarella,cv75-uart
      clk: ambarella: add CV75 CCU driver
      gpio: regmap: support write_data_after_dir and girq
      gpio: pl061: use gpio-regmap and add Ambarella layout
      pinctrl: ambarella: add CV75 pin controller
      serial: 8250_dw: add Ambarella CV75 quirks
      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         |  64 ++
 .../devicetree/bindings/gpio/pl061-gpio.yaml       |  32 +-
 Documentation/devicetree/bindings/mfd/syscon.yaml  |   1 +
 .../bindings/pinctrl/ambarella,cv75-pinctrl.yaml   | 239 +++++++
 .../bindings/serial/snps-dw-apb-uart.yaml          |   1 +
 .../devicetree/bindings/vendor-prefixes.yaml       |   2 +
 MAINTAINERS                                        |  14 +
 arch/arm64/Kconfig.platforms                       |   6 +
 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            | 177 +++++
 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                | 234 +++++++
 drivers/clk/ambarella/ccu_mux_div.h                |  35 +
 drivers/clk/ambarella/ccu_pll.c                    | 421 ++++++++++++
 drivers/clk/ambarella/ccu_pll.h                    |  70 ++
 drivers/gpio/Kconfig                               |   2 +
 drivers/gpio/gpio-pl061.c                          | 342 +++++----
 drivers/gpio/gpio-regmap.c                         |  24 +-
 drivers/pinctrl/Kconfig                            |  15 +
 drivers/pinctrl/Makefile                           |   2 +
 drivers/pinctrl/pinctrl-ambarella-cv75.c           | 561 +++++++++++++++
 drivers/pinctrl/pinctrl-ambarella.c                | 761 +++++++++++++++++++++
 drivers/pinctrl/pinctrl-ambarella.h                |  50 ++
 drivers/tty/serial/8250/8250_dw.c                  |  34 +
 include/dt-bindings/clock/ambarella,cv75-rct.h     |  15 +
 include/linux/amba/bus.h                           |   1 +
 include/linux/gpio/regmap.h                        |  13 +
 37 files changed, 3439 insertions(+), 138 deletions(-)
---
base-commit: 34cf6dafc47441dfb6b356a095b89c3585a93714
change-id: 20260818-cv75-v5-9e2039b349bc

Best regards,
--  
Long Zhao <longzhao@xxxxxxxxxxxxx>