linux-kernel - [PATCH 0/8] Nuvoton WPCM450 pinctrl and GPIO driver

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Date:   Wed,  2 Jun 2021 14:03:21 +0200
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, openbmc@...ts.ozlabs.org,
        Tomer Maimon <tmaimon77@...il.com>,
        Joel Stanley <joel@....id.au>, linux-kernel@...r.kernel.org,
        Jonathan Neuschäfer <j.neuschaefer@....net>
Subject: [PATCH 0/8] Nuvoton WPCM450 pinctrl and GPIO driver

This series adds support for pinctrl and GPIO in the Nuvoton WPCM450 SoC.
Both my DT bindings and my driver are based on the work done by others for
the newer Nuvoton NPCM7xx SoC, and I've tried to keep both similar.

Instead of extending the pinctrl-npcm7xx driver to add WPCM450 support,
I copied/forked it. The pinmux mechanism is very similar (using MFSEL1 and
MFSEL2 registers), but the GPIO register interface has been redesigned for
NPCM7xx; adding support for the older GPIO controller would make the driver
harder to understand, while only enabling a small amount of code sharing.

The DT binding in YAML format might make a good template for also converting
the nuvoton,npcm7xx-pinctrl binding to YAML.

Both in the DT binding and in the driver I kept the name "pinctrl". For the
driver, I find it accurate enough because it handles pinctrl and GPIO. For
the DT node, it's a bit less accurate because the register block at 0xb8003000
is about GPIOs, and pin control happens in the global control registers (GCR)
block, except for input debouncing. So, "GPIO" might be the more appropriate
name component there.

Jonathan Neuschäfer (8):
  dt-bindings: arm/npcm: Add binding for global control registers (GCR)
  MAINTAINERS: Match all of bindings/arm/npcm/ as part of NPCM
    architecture
  ARM: dts: wpcm450: Add global control registers (GCR) node
  dt-bindings: pinctrl: Add Nuvoton WPCM450
  pinctrl: nuvoton: Add driver for WPCM450
  ARM: dts: wpcm450: Add pinctrl node
  ARM: dts: wpcm450: Add pin functions
  ARM: dts: wpcm450-supermicro-x9sci-ln4f: Add GPIO LEDs and buttons

 .../bindings/arm/npcm/nuvoton,gcr.yaml        |   38 +
 .../pinctrl/nuvoton,wpcm450-pinctrl.yaml      |  142 ++
 MAINTAINERS                                   |    2 +
 .../nuvoton-wpcm450-supermicro-x9sci-ln4f.dts |   27 +
 arch/arm/boot/dts/nuvoton-wpcm450.dtsi        |  321 +++++
 drivers/pinctrl/Makefile                      |    2 +-
 drivers/pinctrl/nuvoton/Kconfig               |   14 +
 drivers/pinctrl/nuvoton/Makefile              |    1 +
 drivers/pinctrl/nuvoton/pinctrl-wpcm450.c     | 1230 +++++++++++++++++
 9 files changed, 1776 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/arm/npcm/nuvoton,gcr.yaml
 create mode 100644 Documentation/devicetree/bindings/pinctrl/nuvoton,wpcm450-pinctrl.yaml
 create mode 100644 drivers/pinctrl/nuvoton/pinctrl-wpcm450.c

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2.30.2