linux-kernel - [PATCH v3 0/9] Nuvoton WPCM450 pinctrl and GPIO driver

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Message-Id: <20211224200935.93817-1-j.neuschaefer@gmx.net>
Date:   Fri, 24 Dec 2021 21:09:26 +0100
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,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Avi Fishman <avifishman70@...il.com>,
        Tali Perry <tali.perry1@...il.com>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Benjamin Fair <benjaminfair@...gle.com>,
        Jonathan Neuschäfer <j.neuschaefer@....net>
Subject: [PATCH v3 0/9] Nuvoton WPCM450 pinctrl and GPIO driver

This is version 3 of the WPCM450 pinctrl/GPIO driver patchset.

I made various small changes, most of which were suggested by Andy Shevchenko
and Rob Herring. For details see the individual patches.

I removed the somewhat unusual nuvoton,interrupt-map property again,
to simplify the DT binding. The encoded information is now in the driver.

The last patch of the series is new. It makes use of the new pinctrl
functionality to associate UART pin muxing with the debug serial port.


Best regards,
Jonathan Neuschäfer


v2:
- https://lore.kernel.org/lkml/20211207210823.1975632-1-j.neuschaefer@gmx.net/

v1:
- https://lore.kernel.org/lkml/20210602120329.2444672-1-j.neuschaefer@gmx.net/

> 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 (9):
  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 and GPIO nodes
  ARM: dts: wpcm450: Add pin functions
  ARM: dts: wpcm450-supermicro-x9sci-ln4f: Add GPIO LEDs and buttons
  ARM: dts: wpcm450: Add pinmux information to UART0

 .../bindings/arm/npcm/nuvoton,gcr.yaml        |   48 +
 .../pinctrl/nuvoton,wpcm450-pinctrl.yaml      |  159 +++
 MAINTAINERS                                   |    2 +
 .../nuvoton-wpcm450-supermicro-x9sci-ln4f.dts |   43 +
 arch/arm/boot/dts/nuvoton-wpcm450.dtsi        |  384 ++++++
 drivers/pinctrl/Makefile                      |    2 +-
 drivers/pinctrl/nuvoton/Kconfig               |   18 +
 drivers/pinctrl/nuvoton/Makefile              |    1 +
 drivers/pinctrl/nuvoton/pinctrl-wpcm450.c     | 1132 +++++++++++++++++
 9 files changed, 1788 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

--
2.30.2