[PATCH v7 00/15] Ambarella CV75 SoC minimal bring-up
Long Zhao via B4 Relay
devnull+longzhao.ambarella.com at kernel.org
Tue Sep 15 04:15:30 PDT 2026
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)
Signed-off-by: Long Zhao <longzhao at 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 <arnd at arndb.de>
To: Krzysztof Kozlowski <krzk at kernel.org>
To: Alexandre Belloni <alexandre.belloni at bootlin.com>
To: soc at lists.linux.dev
To: linux-arm-kernel at lists.infradead.org
Cc: Rob Herring <robh at kernel.org>
Cc: Krzysztof Kozlowski <krzk+dt at kernel.org>
Cc: Conor Dooley <conor+dt at kernel.org>
Cc: Michael Turquette <mturquette at baylibre.com>
Cc: Stephen Boyd <sboyd at kernel.org>
Cc: Jerome Brunet <jbrunet at baylibre.com>
Cc: Linus Walleij <linusw at kernel.org>
Cc: Bartosz Golaszewski <brgl at kernel.org>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Cc: Jiri Slaby <jirislaby at kernel.org>
Cc: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
Cc: Ilpo Järvinen <ilpo.jarvinen at linux.intel.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Long Zhao <zl020895 at 163.com>
Cc: Lee Jones <lee at kernel.org>
Cc: mfd at lists.linux.dev
Cc: devicetree at vger.kernel.org
Cc: linux-clk at vger.kernel.org
Cc: linux-gpio at vger.kernel.org
Cc: linux-serial at vger.kernel.org
Cc: linux-kernel at vger.kernel.org
---
Long Zhao (15):
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 to gpio-regmap and a custom irqchip
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 | 366 +++++++++++++
drivers/gpio/Kconfig | 2 +
drivers/gpio/gpio-pl061.c | 589 ++++++++++++++-------
drivers/gpio/gpio-regmap.c | 40 +-
drivers/pinctrl/Kconfig | 17 +
drivers/pinctrl/Makefile | 2 +
drivers/pinctrl/pinctrl-ambarella-cv75.c | 554 +++++++++++++++++++
drivers/pinctrl/pinctrl-ambarella.c | 554 +++++++++++++++++++
drivers/pinctrl/pinctrl-ambarella.h | 44 ++
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, 2625 insertions(+), 199 deletions(-)
---
base-commit: 34cf6dafc47441dfb6b356a095b89c3585a93714
change-id: 20260818-cv75-v5-9e2039b349bc
Best regards,
--
Long Zhao <longzhao at ambarella.com>
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