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

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Message-Id: <20250709112658.1987608-2-ioana.ciornei@nxp.com>
Date: Wed,  9 Jul 2025 14:26:50 +0300
From: Ioana Ciornei <ioana.ciornei@....com>
To: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: Rob Herring <robh@...nel.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: [PATCH 1/9] dt-bindings: gpio: add bindings for the QIXIS FPGA based GPIO controller

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.

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.
+
+  Each controller supports a maximum of 8 GPIO lines and each line has a fixed
+  direction which cannot be changed using a direction register.
+
+properties:
+  compatible:
+    enum:
+      - fsl,lx2160ardb-fpga-gpio-sfp2
+      - fsl,lx2160ardb-fpga-gpio-sfp3
+      - fsl,ls1046aqds-fpga-gpio-stat-pres2
+
+  reg:
+    maxItems: 1
+
+  "#gpio-cells":
+    const: 2
+
+  gpio-controller: true
+
+  gpio-line-names:
+    minItems: 1
+    maxItems: 8
+
+required:
+  - compatible
+  - "#gpio-cells"
+  - gpio-controller
+
+additionalProperties: false
-- 
2.25.1