[PATCH v11 0/9] gpio: add Ambarella CV75 PL061 support

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

The ambarella vendor prefix [1] is in linux-next (applied by Rob).
The binding can be applied with this series.

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

This is v11 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 instantiated with
devm_irq_domain_instantiate() using 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 alternating
rising and falling edges. unbind and bind work; the chip re-registers
and both tools work again after the rebind.

Changes in v11 (from Andy's v10 review):
- pending: keep generic_handle_domain_irq() on one line.
- convert: fit regmap_test_bits() on two lines, return
  regmap_assign_bits() directly, and put the new locals in
  reverse Christmas tree order.
- cleanup: fix the guard()() reference in the commit message and
  use scoped_guard() in pl061_irq_mask()/unmask().
- pl061: keep gc->parent in a local before the gpio-regmap switch,
  so that patch does not rewrite every log line.
- switch: keep the existing GPIO* register macros. Split
  reg_mask_xlate, drop pl061->dev for regmap_get_device(), and
  instantiate the IRQ domain with devm_irq_domain_instantiate().
  The remove action is registered before the gpiochip so devres
  unwinds it after gpiochip_remove() and before the domain removal.
- Drop the flags variable left unused by the guard() conversion.
- unbind/bind cycle tested on the CV75 EVK.
- Link to v10: https://patch.msgid.link/20261015-cv75-gpio-v10-0-3fe3eb315a55@ambarella.com

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 (9):
      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: keep the parent device in a local
      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                          | 538 ++++++++++++++-------
 drivers/gpio/gpio-regmap.c                         |  15 +-
 include/linux/amba/bus.h                           |   1 +
 include/linux/gpio/regmap.h                        |  14 +
 6 files changed, 404 insertions(+), 191 deletions(-)
---
base-commit: 34cf6dafc47441dfb6b356a095b89c3585a93714
change-id: 20261007-cv75-gpio-333d7c1dfe11

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