linux-kernel - Re: [PATCH 1/9] dt-bindings: gpio: add bindings for the QIXIS FPGA based GPIO controller

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Message-ID: <20250710220132.GA4038128-robh@kernel.org>
Date: Thu, 10 Jul 2025 17:01:32 -0500
From: Rob Herring <robh@...nel.org>
To: Ioana Ciornei <ioana.ciornei@....com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Shawn Guo <shawnguo@...nel.org>, Michael Walle <mwalle@...nel.org>,
	Lee Jones <lee@...nel.org>, Frank Li <Frank.Li@....com>
Subject: Re: [PATCH 1/9] dt-bindings: gpio: add bindings for the QIXIS FPGA
 based GPIO controller

On Wed, Jul 09, 2025 at 02:26:50PM +0300, Ioana Ciornei wrote:
> Add a device tree binding for the QIXIS FPGA based GPIO controller.
> Depending on the board, the QIXIS FPGA exposes registers which act as a
> GPIO controller, each with 8 GPIO lines of fixed direction.
> 
> Since each QIXIS FPGA layout has its particularities, add a separate
> compatible string for each board/GPIO register combination supported.

This could be covered in my proposed trivial gpio schema[1].


> 
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
> ---
>  .../bindings/gpio/fsl,fpga-gpio.yaml          | 44 +++++++++++++++++++
>  1 file changed, 44 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/fsl,fpga-gpio.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpio/fsl,fpga-gpio.yaml b/Documentation/devicetree/bindings/gpio/fsl,fpga-gpio.yaml
> new file mode 100644
> index 000000000000..dc7b6c0d9b40
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/fsl,fpga-gpio.yaml
> @@ -0,0 +1,44 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/fsl,fpga-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: GPIO controller embedded in the NXP QIXIS FPGA
> +
> +maintainers:
> +  - Ioana Ciornei <ioana.ciornei@....com>
> +
> +description: |
> +  This module is part of the QIXIS FPGA found on some Layerscape boards such as
> +  LX2160ARDB and LS1046AQDS. For more details see
> +  ../board/fsl,fpga-qixis-i2c.yaml.

Or this is simple enough, just add this as a child node in that schema.

Rob

[1] https://lore.kernel.org/all/20250701225355.2977294-1-robh@kernel.org/