dt-bindings: w1: Add DS2482/DS2484 I2C to 1-W bridges

This adds a dedicated devicetree binding for the Maxim DS2482/DS2484
I2C to 1-W bridges, which can be extended later for further features
(e.g. sleep mode control GPIO). Since one wire is a bus, child nodes
needs to be allowed here.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stefan Wahren <stefan.wahren@chargebyte.com>
Link: https://lore.kernel.org/r/20230406103137.6092-2-stefan.wahren@chargebyte.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/w1/maxim,ds2482.yaml b/Documentation/devicetree/bindings/w1/maxim,ds2482.yaml
new file mode 100644 (file)
index 0000000..422becc
--- /dev/null
+++ b/Documentation/devicetree/bindings/w1/maxim,ds2482.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/w1/maxim,ds2482.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim One wire bus master controller
+
+maintainers:
+  - Stefan Wahren <stefan.wahren@chargebyte.com>
+
+description: |
+  I2C to 1-wire bridges
+
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ds2482-100.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/DS2482-800.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/DS2484.pdf
+
+properties:
+  compatible:
+    enum:
+      - maxim,ds2482
+      - maxim,ds2484
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties:
+  type: object
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      onewire@18 {
+        compatible = "maxim,ds2484";
+        reg = <0x18>;
+      };
+    };