[PATCH v10 0/8] gpio: add Ambarella CV75 PL061 support

[Long Zhao via B4 Relay <devnull+longzhao.ambarella.com@kernel.org>]

The ambarella vendor prefix [1] is applied in the devicetree tree.
Do not apply the binding until the prefix reaches linux-next. The
driver patches do not have that dependency.

Please take this series through the GPIO tree. The quirk, the PL061
conversion and the Ambarella layout belong together.

This is v10 of the GPIO patches from the combined CV75 series. The
posting on Oct 9 numbered them v1 after the split. That was a
mistake.

These patches convert the ARM PL061 data path to regmap, then add
the CV75 layout.

GPIO data path uses gpio-regmap with two layouts (ARM PrimeCell and
Ambarella). ARM PL061 sets GPIO_REGMAP_QUIRK_SET_AFTER_DIR. IRQ stays
a custom PL061 irqchip. The linear domain is created with the PL061
private data and attached by gpio-regmap. regmap-irq is not used.

Tested on the CV75 EVK. The board boots. gpio-hammer toggles gpiochip0
line 26 ten times, and gpio-event-mon on line 27 records ten
alternating rising and falling edges.

Changes since the combined v9 [2]:
- dt-bindings: explain that CV75 is a modified PL061 (Conor).
- gpio-regmap: move quirks after fixed_direction_output (Andy).
- gpio: pl061: Andy's review on the regmap conversion and switch:
  use regmap_test_bits()/clear_bits()/set_bits()/assign_bits(),
  drop the redundant if (pending) and fast_io, introduce the ARM
  regmap_config (including REGCACHE_FLAT_S) in the convert patch
  and leave it there, blank line after guard() plus the blank-line
  and reverse Christmas tree cleanups, and keep the upstream
  pl061_irq_chip name and unsigned irq_type() trigger without
  adding .name.
- gpio: pl061: cache DAT (REGCACHE_FLAT_S, not volatile) so
  gpio_set() does not read-modify-write the pin level (Sashiko).

Changes since the Oct 9 GPIO posting [3]:
- gpio: pl061: Andy's follow-ups since that posting: assign_bits
  for DAT writes, drop fast_io, name the ARM regmap_config in the
  convert patch, the guard()/blank-line/irq_type cleanups, and keep
  the upstream pl061_irq_chip name and unsigned trigger without
  adding .name.
- gpiolib: regmap: add Michael Walle's Reviewed-by on
  GPIO_REGMAP_QUIRK_SET_AFTER_DIR.
- gpio: pl061: restore Andy's and Linus's Reviewed-by on the
  Ambarella variant.

[1] https://patch.msgid.link/20261014-cv75-prefix-v1-1-fe95ed567880@ambarella.com
[2] https://patch.msgid.link/20261001-cv75-v5-v9-0-486cc289a4b8@ambarella.com
[3] https://patch.msgid.link/20261009-cv75-gpio-v1-0-5836bd438423@ambarella.com

To: Bartosz Golaszewski <brgl@kernel.org>
To: linux-gpio@vger.kernel.org
Cc: Linus Walleij <linusw@kernel.org>
Cc: Michael Walle <mwalle@kernel.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: Long Zhao <longzhao@ambarella.com>
Cc: Long Zhao <zl020895@163.com>
Cc: linux-kernel@vger.kernel.org

Assisted-by: LLM
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
Long Zhao (8):
      dt-bindings: gpio: pl061: add Ambarella CV75 variant
      gpiolib: regmap: add GPIO_REGMAP_QUIRK_SET_AFTER_DIR
      gpio: pl061: drop redundant pending check in the IRQ handler
      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

 .../devicetree/bindings/gpio/pl061-gpio.yaml       |  25 +-
 drivers/gpio/Kconfig                               |   2 +
 drivers/gpio/gpio-pl061.c                          | 552 +++++++++++++--------
 drivers/gpio/gpio-regmap.c                         |  15 +-
 include/linux/amba/bus.h                           |   1 +
 include/linux/gpio/regmap.h                        |  14 +
 6 files changed, 409 insertions(+), 200 deletions(-)
---
base-commit: 34cf6dafc47441dfb6b356a095b89c3585a93714
change-id: 20261007-cv75-gpio-333d7c1dfe11

Best regards,
--  
Long Zhao <longzhao@ambarella.com>