[PATCH v3] dt-bindings: i2c: intel,ixp4xx-i2c: Convert to DT schema

[Shi Hao <i.shihao.999@gmail.com>]

Convert the IOP3xx and IXP4xx XScale bindings to DT schema. This
conversion also adds the interrupts property, as it is used by the driver
and existing DTS files but was not documented in the original binding.

Signed-off-by: Shi Hao <i.shihao.999@gmail.com>
---

v3:

- Add description for adding interrupts property in commit

v2: https://lore.kernel.org/linux-devicetree/20260328101157.84191-1-i.shihao.999@gmail.com/T/#u

- Fix checkpatch.pl warnings
- Reorder compatibles in alphabetical order

Note:
* This patch is part of the GSoC2026 application process for device tree bindings conversions
* https://github.com/LinuxFoundationGSoC/ProjectIdeas/wiki/GSoC-2026-Device-Tree-Bindings
---
 .../devicetree/bindings/i2c/i2c-iop3xx.txt    | 20 ---------
 .../bindings/i2c/intel,ixp4xx-i2c.yaml        | 41 +++++++++++++++++++
 2 files changed, 41 insertions(+), 20 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/i2c/i2c-iop3xx.txt
 create mode 100644 Documentation/devicetree/bindings/i2c/intel,ixp4xx-i2c.yaml

diff --git a/Documentation/devicetree/bindings/i2c/i2c-iop3xx.txt b/Documentation/devicetree/bindings/i2c/i2c-iop3xx.txt
deleted file mode 100644
index dcc8390e0d24..000000000000
--- a/Documentation/devicetree/bindings/i2c/i2c-iop3xx.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-i2c Controller on XScale platforms such as IOP3xx and IXP4xx
-
-Required properties:
-- compatible : Must be one of
-  "intel,iop3xx-i2c"
-  "intel,ixp4xx-i2c";
-- reg
-- #address-cells = <1>;
-- #size-cells = <0>;
-
-Optional properties:
-- Child nodes conforming to i2c bus binding
-
-Example:
-
-i2c@c8011000 {
-	compatible = "intel,ixp4xx-i2c";
-	reg = <0xc8011000 0x18>;
-	interrupts = <33 IRQ_TYPE_LEVEL_LOW>;
-};
diff --git a/Documentation/devicetree/bindings/i2c/intel,ixp4xx-i2c.yaml b/Documentation/devicetree/bindings/i2c/intel,ixp4xx-i2c.yaml
new file mode 100644
index 000000000000..15ef510f6fd8
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/intel,ixp4xx-i2c.yaml
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/intel,ixp4xx-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: I2c Controller on XScale platforms such as IOP3xx and IXP4xx
+
+maintainers:
+  - Andi Shyti <andi.shyti@kernel.org>
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - intel,iop3xx-i2c
+      - intel,ixp4xx-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c@c8011000 {
+        compatible = "intel,ixp4xx-i2c";
+        reg = <0xc8011000 0x18>;
+        interrupts = <33 IRQ_TYPE_LEVEL_LOW>;
+    };
-- 
2.53.0