linux-kernel - [PATCH 0/3] Support pinctrl for Loongson 2K0300 SoC

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Message-ID: <20250811163749.47028-2-ziyao@disroot.org>
Date: Mon, 11 Aug 2025 16:37:47 +0000
From: Yao Zi <ziyao@...root.org>
To: Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>
Cc: linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	loongarch@...ts.linux.dev,
	Mingcong Bai <jeffbai@...c.io>,
	Kexy Biscuit <kexybiscuit@...c.io>,
	Yao Zi <ziyao@...root.org>
Subject: [PATCH 0/3] Support pinctrl for Loongson 2K0300 SoC

This series adds support for Loongson 2K0300's pin controller, which is
much different from the previous generation's one: pin multiplexing
could be done for each pin, instead of at units of pin groups. A new
driver, pinctrl-ls2k0300.c, is introduced to handle this.

This controller is also capable of drive-strength configuration for some
functions, with a limitation that all pins configured to the the same
function share the same drive-strength. Thus drive-strength is described
as a property of function, and is handled bypassing the generic pinconf
API for less complexity, since the pinconf API is based on the pingroups.

The devicetree patch depends on v3 of "Add clock support for Loongson
2K0300 SoC"[1] for applying. Further comments, especially on handling of
the only pinconf attribute, drive-strength, will be appreciated. Thanks
again for your time and review.

[1]: https://lore.kernel.org/all/20250805150147.25909-1-ziyao@disroot.org/

Yao Zi (3):
  dt-binding: pinctrl: Document Loongson 2K0300 pin controller
  pinctrl: ls2k0300: Support Loongson 2K0300 SoC
  LoongArch: dts: Add pinctrl configuration for Loongson 2K0300

 .../pinctrl/loongson,ls2k0300-pinctrl.yaml    |  92 ++++
 MAINTAINERS                                   |   7 +
 arch/loongarch/boot/dts/loongson-2k0300.dtsi  |  39 ++
 drivers/pinctrl/Kconfig                       |  14 +
 drivers/pinctrl/Makefile                      |   1 +
 drivers/pinctrl/pinctrl-ls2k0300.c            | 515 ++++++++++++++++++
 6 files changed, 668 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/loongson,ls2k0300-pinctrl.yaml
 create mode 100644 drivers/pinctrl/pinctrl-ls2k0300.c

-- 
2.50.1