[PATCH v5 0/5] riscv: spacemit: add gpio support for K1 SoC

[Yixun Lan <dlan@xxxxxxxxxx>]

The gpio controller of K1 support basic GPIO functions,
which capable of enabling as input, output. It can also be used
as GPIO interrupt which able to detect rising edge, falling edge,
or both. There are four GPIO ports, each consisting of 32 pins and
has indepedent register sets, while still sharing IRQ line and clocks.

The GPIO controller request the clock source from APBC block,
In this series, I haven't added the clock support, but plan
to fix it after clock driver is merged.

Due to first three GPIO ports has interleave register settings, some
resources (IRQ, clock) are shared by all pins.

The GPIO docs of K1 SoC can be found here, chapter 16.4 GPIO [1]

Note, this patch is rebased to v6.14-rc1.

This patch series has been tested on Bananapi-F3 board,
with following GPIO cases passed:
 1) gpio input
 2) gpio output - set to high, low
 3) gpio interrupt - rising trigger, falling trigger, both edge trigger

This version should resolve DT related concern in V4, and register each bank as
indepedent gpio chip in driver, no more sub children gpio DT node needed.

Link: https://developer.spacemit.com/documentation?token=Rn9Kw3iFHirAMgkIpTAcV2Arnkf [1]
Link: https://lore.kernel.org/all/20240730-k1-01-basic-dt-v5-0-98263aae83be@xxxxxxxxxx [2]
Link: https://lore.kernel.org/all/20241016-02-k1-pinctrl-v5-0-03d395222e4f@xxxxxxxxxx/ [3]
Signed-off-by: Yixun Lan <dlan@xxxxxxxxxx>
---
Changes in v5:
- export add_pin_range() from gpio core, support to add custom version
- change to 3 gpio cells, model to <bank number>, <bank offset>, <gpio flag>
- fold children DT nodes into parent
- Link to v4: https://lore.kernel.org/r/20250121-03-k1-gpio-v4-0-4641c95c0194@xxxxxxxxxx

Changes in v4:
- gpio: re-construct gpio as four independent ports, also leverage gpio mmio API
- gpio interrupt: convert to generic gpio irqchip
- Link to v3: https://lore.kernel.org/r/20241225-03-k1-gpio-v3-0-27bb7b441d62@xxxxxxxxxx

Changes in v3:
- dt: drop ranges, interrupt-names property
- Link to v2: https://lore.kernel.org/r/20241219-03-k1-gpio-v2-0-28444fd221cd@xxxxxxxxxx

Changes in v2:
- address dt-bindings comments, simplify example
- rebase to 6.13-rc3 
- Link to v1: https://lore.kernel.org/r/20240904-03-k1-gpio-v1-0-6072ebeecae0@xxxxxxxxxx

---
Yixun Lan (5):
      gpio: of: support to add custom add pin range function
      dt-bindings: gpio: spacemit: add support for K1 SoC
      gpio: spacemit: add support for K1 SoC
      riscv: dts: spacemit: add gpio support for K1 SoC
      riscv: dts: spacemit: add gpio LED for system heartbeat

 .../devicetree/bindings/gpio/spacemit,k1-gpio.yaml |  81 +++++
 arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts    |  11 +
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi       |   3 +
 arch/riscv/boot/dts/spacemit/k1.dtsi               |  15 +
 drivers/gpio/Kconfig                               |   8 +
 drivers/gpio/Makefile                              |   1 +
 drivers/gpio/gpio-spacemit-k1.c                    | 376 +++++++++++++++++++++
 drivers/gpio/gpiolib-of.c                          |   5 +-
 include/linux/gpio/driver.h                        |   7 +
 9 files changed, 506 insertions(+), 1 deletion(-)
---
base-commit: 3d72d603afa72082501e9076eed61e0531339ef8
change-id: 20240828-03-k1-gpio-61bf92f9032c

Best regards,
-- 
Yixun Lan