[PATCH] dt-bindings: mfd: ti,keystone-devctrl: Convert to DT schema

Convert the Texas Instruments Keystone Device State Control binding from
legacy text format to DT schema.

During the conversion, the following updates were made:
- Added "simple-mfd" to the allowed compatible strings.
- Enforced child bus properties (#address-cells, #size-cells, and ranges)
  to be required only when the "simple-mfd" compatible is present.
- Added patternProperties definitions to validate standard child nodes
- Updated the examples to demonstrate simple-mfd parent usage and updated
  node names to conform with standard Devicetree specifications.

Signed-off-by: Bhargav Joshi <[email protected]>
---
Note:
Running dt_binding_check on patch will yield a warning for
'ti,keystone-reset' in the example block. The YAML conversion patch
for that child node is already in progress here:
https://lore.kernel.org/linux-devicetree/[email protected]/
---
 .../bindings/mfd/ti,keystone-devctrl.yaml          | 105 +++++++++++++++++++++
 .../bindings/mfd/ti-keystone-devctrl.txt           |  19 ----
 2 files changed, 105 insertions(+), 19 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/ti,keystone-devctrl.yaml b/Documentation/devicetree/bindings/mfd/ti,keystone-devctrl.yaml
new file mode 100644
index 000000000000..33a72c290fb1
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/ti,keystone-devctrl.yaml
@@ -0,0 +1,105 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/ti,keystone-devctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments Keystone Device State Control
+
+maintainers:
+  - Ivan Khoronzhuk <[email protected]>
+
+description:
+  The Keystone II devices have a set of registers that are used to control the
+  status of its peripherals. This node is intended to allow access to this
+  functionality.
+
+properties:
+  compatible:
+    minItems: 2
+    items:
+      - const: ti,keystone-devctrl
+      - const: syscon
+      - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  ranges: true
+
+patternProperties:
+  "^keystone_dsp_gpio@[0-9a-f]+$":
+    type: object
+    description: Keystone DSP GPIO controller
+
+  "^keystone_irq@[0-9a-f]+$":
+    type: object
+    description: Keystone DSP to ARM interrupt controller
+
+  "^reset-controller@[0-9a-f]+$":
+    type: object
+    description: Keystone reset controller
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: simple-mfd
+    then:
+      required:
+        - "#address-cells"
+        - "#size-cells"
+        - ranges
+    else:
+      properties:
+        "#address-cells": false
+        "#size-cells": false
+        ranges: false
+
+additionalProperties: false
+
+examples:
+  - |
+    device-state-control@2620000 {
+        compatible = "ti,keystone-devctrl", "syscon";
+        reg = <0x02620000 0x1000>;
+    };
+
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    device-state-control@2620000 {
+        compatible = "ti,keystone-devctrl", "syscon", "simple-mfd";
+        reg = <0x02620000 0x1000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0x0 0x02620000 0x1000>;
+
+        keystone_irq@2a0 {
+            compatible = "ti,keystone-irq";
+            reg = <0x2a0 0x4>;
+            interrupts = <GIC_SPI 4 IRQ_TYPE_EDGE_RISING>;
+            interrupt-controller;
+            #interrupt-cells = <1>;
+            ti,syscon-dev = <&devctrl 0x2a0>;
+        };
+
+        reset-controller@328 {
+            compatible = "ti,keystone-reset";
+            reg = <0x328 0x10>;
+            ti,syscon-pll = <&pllctrl 0xe4>;
+            ti,syscon-dev = <&devctrl 0x328>;
+            ti,wdt-list = <0>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/mfd/ti-keystone-devctrl.txt b/Documentation/devicetree/bindings/mfd/ti-keystone-devctrl.txt
deleted file mode 100644
index 71a1f5963936..000000000000
--- a/Documentation/devicetree/bindings/mfd/ti-keystone-devctrl.txt
+++ /dev/null
@@ -1,19 +0,0 @@
-* Device tree bindings for Texas Instruments keystone device state control
-
-The Keystone II devices have a set of registers that are used to control
-the status of its peripherals. This node is intended to allow access to
-this functionality.
-
-Required properties:
-
-- compatible:		"ti,keystone-devctrl", "syscon"
-
-- reg:			contains offset/length value for device state control
-			registers space.
-
-Example:
-
-devctrl: device-state-control@02620000 {
-	compatible = "ti,keystone-devctrl", "syscon";
-	reg = <0x02620000 0x1000>;
-};

---
base-commit: 3d6d817622b0a9721e3cc404df3469171582be13
change-id: 20260813-ti-keystone-devctrl-6e49212fe35d

Best regards,
-- 
Bhargav