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Mon, 21 Sep 2026 04:23:31 +0000 (UTC) From: Long Zhao via B4 Relay Subject: [PATCH v8 00/18] Ambarella CV75 SoC minimal bring-up Date: Mon, 21 Sep 2026 12:23:19 +0800 Message-Id: <20260921-cv75-v5-v8-0-282ff5d98dda@ambarella.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-B4-Tracking: v=1; b=H4sIADexsGoC/12Oyw6CMBQFf4V0bU0flFJX/odh0ZaL1PAwLTYaw r9b0EjicpLJmTOjAN5BQKdsRh6iC24cEpSHDNlWD1fArk6MGGEFKWmJbZQCR4EVMMKV4bkyFiW 78WOPp9aD3n1F8p8fC0wwKFoKmlvDDT3r3mgPXaePduzXibuHxj23M5fqw+FhbmCndXE1Whem0 b+2t1Gu3jdExR6SKcSZkjVvjFWW/IWqZVneFjB4kfcAAAA= X-Change-ID: 20260818-cv75-v5-9e2039b349bc To: Arnd Bergmann , Krzysztof Kozlowski , Alexandre Belloni , soc@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: Long Zhao , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Michael Turquette , Stephen Boyd , Jerome Brunet , Linus Walleij , Bartosz Golaszewski , Greg Kroah-Hartman , Jiri Slaby , Andy Shevchenko , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Catalin Marinas , Will Deacon , Long Zhao , Lee Jones , mfd@lists.linux.dev, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Krzysztof Kozlowski X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1789964608; l=9007; i=longzhao@ambarella.com; s=20260730; h=from:subject:message-id; bh=I1oz/BIXIpqFmbw76pDEHQclQnRuF2a/f6bbBU49BIc=; b=iydgS3pc34184j+NH1KGvL2L0NSIGDth2FRAl9/r2vY0HWbKKnwK2uEx+09xI0N+dkCVQ7ztF wwDtYHQmyFUCBCkAarDG5ZvsvImVAd6yk9jwEB1U5oT5urdQtsU/5X7 X-Developer-Key: i=longzhao@ambarella.com; a=ed25519; pk=/xGhPTOX0/eYsyTWzyjjgAIW1Z/YD+IlnOnvcdRozow= X-Endpoint-Received: by B4 Relay for longzhao@ambarella.com/20260730 with auth_id=903 X-Original-From: Long Zhao X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: longzhao@ambarella.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series adds minimal Ambarella CV75 support for early bring-up with a serial console: DT bindings, RCT 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. GPIO data path uses gpio-regmap with two layouts (ARM PrimeCell and Ambarella). IRQ stays a custom PL061 irqchip: a linear domain is created after gpio_regmap_register(), attached with gpiochip_irqchip_add_domain() via gpio_regmap_get_chip(), and the chained handler uses gpio_chip as chip data. gpio-regmap girq and regmap-irq are not used. 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) with CONFIG_PROVE_LOCKING after use_raw_spinlock Signed-off-by: Long Zhao --- Changes in v8: - gpio: split v7 10/15 into 10/18 MMIO to regmap, 11/18 IRQ_TYPE_* helpers, 12/18 cleanup.h guard(), 13/18 gpio-regmap + custom irqchip, 14/18 Ambarella layout (Andy) - gpio: keep gpio_regmap_get_chip(); drop the irq_domain attach change in gpio-regmap (Andy) - gpio-regmap: skip the pre-direction data write when write_data_after_dir is set (Linus); still ignore gpio_regmap_set() returns (Andy) - gpio: use_raw_spinlock so irq_ack() can run under the irq descriptor lock (PROVE_LOCKING on CV75); irq_set_parent() for wake - gpio: drop errno.h; -ENODATA; for_each_set_bit in PM; split virq assignment; chained handler checks regmap_read (Andy) - pinctrl: 15/18 PINCTRL_PINGROUP + per-pin alts; header uses forward declarations; regmap_assign_bits / __assign_bit; -ENOTSUPP; -ENODATA; devm_kasprintf_strarray (Andy) - dt-bindings: gpio: 05/18 move allOf after required; explain why CV75 is PrimeCell GPIO but not an arm,pl061 fallback, and why a fixed arm,primecell-periphid is required (Krzysztof) - serial: 16/18 keep snps,dw-apb-uart first; Andy and Ilpo R-b - clk: drop mod_devicetable.h; use u16_fract (Andy, Uwe) - collect lore tags on unchanged bindings (Linus, Krzysztof) Link to v7: https://patch.msgid.link/20260915-cv75-v5-v7-0-3297d3fbc9c0@ambarella.com Changes in v7: - gpio: 10/15 convert ARM PL061 to gpio-regmap; 11/15 add Ambarella layout with a second gpio_regmap config (Andy) - gpio: 10/15 drop gpio-regmap girq; custom irqchip with a linear domain, gpio_chip chip data, and a chained handler (Andy) - gpio-regmap: 08/15 write_data_after_dir; 09/15 gpio_regmap_get_chip() and quirk kerneldoc (Andy) - dt-bindings: gpio: 05/15 $ref arm/primecell.yaml and unevaluatedProperties (Rob) - clk: fold the RCT driver into a single clk-cv75.c (Jerome) - serial: 8250_dw startup only updates the up->ier shadow (Ilpo) - collect lore tags on unchanged patches (Linus Reviewed-by; Krzysztof Acked-by on the UART binding) Link to v6: https://lore.kernel.org/r/20260904-cv75-v5-v6-0-e918514cb3b1@ambarella.com 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@ambarella.com Link to v2: https://lore.kernel.org/r/20260806-longzhao-upstream-cv75-v2-v2-0-6b09707c5fe9@ambarella.com Link to v3-A: https://lore.kernel.org/r/20260813-cv75-v3-a-v3-0-cfdd20b1b4dd@ambarella.com Link to v3-B: https://lore.kernel.org/r/20260813-cv75-v3-b-v3-0-1d82e18da09b@ambarella.com Link to v3-C: https://lore.kernel.org/r/20260813-cv75-v3-c-v3-0-9352b3fd6026@ambarella.com Link to v4-B: https://lore.kernel.org/r/20260814-cv75-v4-b-v4-0-622e63153d97@ambarella.com To: Arnd Bergmann To: Krzysztof Kozlowski To: Alexandre Belloni To: soc@lists.linux.dev To: linux-arm-kernel@lists.infradead.org Cc: Rob Herring Cc: Krzysztof Kozlowski Cc: Conor Dooley Cc: Michael Turquette Cc: Stephen Boyd Cc: Jerome Brunet Cc: Linus Walleij Cc: Bartosz Golaszewski Cc: Greg Kroah-Hartman Cc: Jiri Slaby Cc: Andy Shevchenko Cc: Ilpo Järvinen Cc: Catalin Marinas Cc: Will Deacon Cc: Long Zhao Cc: Lee Jones Cc: mfd@lists.linux.dev Cc: devicetree@vger.kernel.org Cc: linux-clk@vger.kernel.org Cc: linux-gpio@vger.kernel.org Cc: linux-serial@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- Long Zhao (18): 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 RCT clock controller gpiolib: regmap: add write_data_after_dir quirk gpiolib: regmap: add gpio_regmap_get_chip() gpio: pl061: convert register access to regmap gpio: pl061: use IRQ_TYPE_LEVEL_MASK and IRQ_TYPE_EDGE_BOTH gpio: pl061: use cleanup helpers for locks gpio: pl061: switch data path to gpio-regmap gpio: pl061: add Ambarella register-layout variant 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 | 25 +- Documentation/devicetree/bindings/mfd/syscon.yaml | 1 + .../bindings/pinctrl/ambarella,cv75-pinctrl.yaml | 237 +++++++++ .../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 | 9 + drivers/clk/ambarella/Makefile | 3 + drivers/clk/ambarella/clk-cv75.c | 365 +++++++++++++ drivers/gpio/Kconfig | 2 + drivers/gpio/gpio-pl061.c | 551 ++++++++++++------- drivers/gpio/gpio-regmap.c | 25 +- drivers/pinctrl/Kconfig | 17 + drivers/pinctrl/Makefile | 2 + drivers/pinctrl/pinctrl-ambarella-cv75.c | 587 +++++++++++++++++++++ drivers/pinctrl/pinctrl-ambarella.c | 533 +++++++++++++++++++ drivers/pinctrl/pinctrl-ambarella.h | 40 ++ drivers/tty/serial/8250/8250_dw.c | 32 ++ include/dt-bindings/clock/ambarella,cv75-rct.h | 14 + include/linux/amba/bus.h | 1 + include/linux/gpio/regmap.h | 9 + 31 files changed, 2587 insertions(+), 191 deletions(-) --- base-commit: 34cf6dafc47441dfb6b356a095b89c3585a93714 change-id: 20260818-cv75-v5-9e2039b349bc Best regards, -- Long Zhao