linux-kernel - [PATCH v2 0/8] Nuvoton WPCM450 pinctrl and GPIO driver

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Message-Id: <20211207210823.1975632-1-j.neuschaefer@gmx.net>
Date:   Tue,  7 Dec 2021 22:08:15 +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,
        Jonathan Neuschäfer <j.neuschaefer@....net>
Subject: [PATCH v2 0/8] Nuvoton WPCM450 pinctrl and GPIO driver

It's been a while, but here is finally version 2 of the WPCM450 GPIO driver.

The biggest change since v1 has been the restructuring of the DT binding to
give each GPIO bank its own node.

Another thing that changed is how pins are muxed to GPIO mode: In v1, this
happened automatically when the corresponding GPIO was used. I copied this
feature from the pinctrl-npcm7xx driver, but removed it along with the
.gpio_request_enable and .gpio_disable_free callbacks. Instead, pins can now
be switched to GPIO explicitly, if needed.

Everything else is noted in the individual patches.

I hope I didn't miss anything that was requested in response to v1. If I did,
please make your comment again.


Best regards,
Jonathan Neuschäfer


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 (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 and GPIO nodes
  ARM: dts: wpcm450: Add pin functions
  ARM: dts: wpcm450-supermicro-x9sci-ln4f: Add GPIO LEDs and buttons

 .../bindings/arm/npcm/nuvoton,gcr.yaml        |   45 +
 .../pinctrl/nuvoton,wpcm450-pinctrl.yaml      |  190 +++
 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     | 1134 +++++++++++++++++
 9 files changed, 1818 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