[PATCH v4 0/3] riscv: spacemit: add pinctrl support to K1 SoC

[Yixun Lan]

This series adds pinctrl support to SpacemiT's K1 SoC, the controller
uses a single register to describe all pin functions, including
bias pull up/down, drive strength, schmitter trigger, slew rate,
strong pull-up, mux mode. In patch #3, we add the pinctrl property of
uart device for the Bananapi-F3 board.

You can find the pinctrl docs of K1 here[1], and the original vendor's 
pinctrl dts data here[2].

Note, we rewrite this series as an independent pinctrl driver for K1 SoC,
which means it does not use pinctrl-single driver as the model anymore,
see the suggestion from Krzysztof at [3].

Link: https://developer.spacemit.com/documentation?token=An1vwTwKaigaXRkYfwmcznTXned [1]
Link: https://gitee.com/bianbu-linux/linux-6.1/blob/bl-v1.0.y/arch/riscv/boot/dts/spacemit/k1-x_pinctrl.dtsi [2]
Link: https://lore.kernel.org/all/b7a01cba-9f68-4a6f-9795-b9103ee81d8b@kernel.org/ [3]
Signed-off-by: Yixun Lan <dlan at gentoo.org>
---
Changes in v4:
- squash dts patch (drop patch #3)
- collect review tags
- Patch #2
 - fix pin id mapping
 - improve pinconf debugfs
- Link to v3: https://lore.kernel.org/r/20240828-02-k1-pinctrl-v3-0-1fed6a22be98@gentoo.org

Changes in v3:
- dt-bindings: drop vendor specific properties, fix format
- rework pinctrl's gpio request function
- fix logic of slew rate & drive strength
- add power-source check
- improve debugfs info
- Link to v2: https://lore.kernel.org/r/20240825-02-k1-pinctrl-v2-0-ddd38a345d12@gentoo.org

Changes in v2:
- drop using pinctrl-single driver for K1
- rewite as independent pinctrl driver
- rebase to v6.11-rc5
- Link to v1: https://lore.kernel.org/r/20240719-02-k1-pinctrl-v1-0-239ac5b77dd6@gentoo.org

---
Yixun Lan (3):
      dt-bindings: pinctrl: spacemit: add support for K1 SoC
      pinctrl: spacemit: add support for SpacemiT K1 SoC
      riscv: dts: spacemit: add pinctrl property to uart0 in BPI-F3

 .../bindings/pinctrl/spacemit,k1-pinctrl.yaml      |  124 +++
 arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts    |    3 +
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi       |   20 +
 arch/riscv/boot/dts/spacemit/k1.dtsi               |    5 +
 drivers/pinctrl/Kconfig                            |    1 +
 drivers/pinctrl/Makefile                           |    1 +
 drivers/pinctrl/spacemit/Kconfig                   |   17 +
 drivers/pinctrl/spacemit/Makefile                  |    3 +
 drivers/pinctrl/spacemit/pinctrl-k1.c              | 1078 ++++++++++++++++++++
 drivers/pinctrl/spacemit/pinctrl-k1.h              |   40 +
 10 files changed, 1292 insertions(+)
---
base-commit: 431c1646e1f86b949fa3685efc50b660a364c2b6
change-id: 20240708-02-k1-pinctrl-3a2b0ec13101
prerequisite-change-id: 20240626-k1-01-basic-dt-1aa31eeebcd2:v5
prerequisite-patch-id: 47dcf6861f7d434d25855b379e6d7ef4ce369c9c
prerequisite-patch-id: 77787fe82911923aff15ccf565e8fa451538c3a6
prerequisite-patch-id: b0bdb1742d96c5738f05262c3b0059102761390b
prerequisite-patch-id: 3927d39d8d77e35d5bfe53d9950da574ff8f2054
prerequisite-patch-id: a98039136a4796252a6029e474f03906f2541643
prerequisite-patch-id: c95f6dc0547a2a63a76e3cba0cf5c623b212b4e6
prerequisite-patch-id: 66e750e438ee959ddc2a6f0650814a2d8c989139
prerequisite-patch-id: 29a0fd8c36c1a4340f0d0b68a4c34d2b8abfb1ab
prerequisite-patch-id: 0bdfff661c33c380d1cf00a6c68688e05f88c0b3
prerequisite-patch-id: 99f15718e0bfbb7ed1a96dfa19f35841b004dae9

Best regards,
-- 
Yixun Lan <dlan at gentoo.org>