[PATCH 2/3] dt-bindings: mfd: Add Realtek ISO system controller

Yu-Chun Lin
2025-11-05T10:47:35Z

Add DT binding schema for Realtek system controller.

Signed-off-by: Yu-Chun Lin <eleanor.lin@realtek.com>
---
.../bindings/mfd/realtek,iso-system.yaml | 65 +++++++++++++++++++
1 file changed, 65 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/realtek,iso-system.yaml

diff --git a/Documentation/devicetree/bindings/mfd/realtek,iso-system.yaml b/Documentation/devicetree/bindings/mfd/realtek,iso-system.yaml
new file mode 100644
index 000000000000..6fbdedd3ee5b
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/realtek,iso-system.yaml
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/realtek,iso-system.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Realtek ISO System Controller
+
+description: |
+ The Realtek ISO System Controller is a register area that contains
+ miscellaneous system registers for the SoC and serves as a parent node
+ for other functions.
+
+maintainers:
+ - James Tai <james.tai@realtek.com>
+ - Yu-Chun Lin <eleanor.lin@realtek.com>
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - realtek,iso-system
+ - const: syscon
+ - const: simple-mfd
+
+ reg:
+ maxItems: 1
+
+ ranges:
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 1
+
+ reg-io-width:
+ const: 4
+
+patternProperties:
+ "^.*@[0-9a-f]+$":
+ type: object
+ description: Catch-all for other sub-devices in the ISO area.
+
+required:
+ - compatible
+ - reg
+ - ranges
+ - '#address-cells'
+ - '#size-cells'
+ - reg-io-width
+
+additionalProperties: false
+
+examples:
+ - |
+ iso: syscon@7000 {
+ compatible = "realtek,iso-system", "syscon", "simple-mfd";
+ reg = <0x7000 0x1000>;
+ ranges = <0x0 0x7000 0x1000>;
+ reg-io-width = <4>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ };
--
2.34.1