WILC3000 is a combo chip providing 802.11b/g/n and Bluetooth 5. The wlan
part is exposed either through SDIO or SPI interface, and the bluetooth
part is exposed through uart. The notable peculiarity of this chip is
that the bluetooth part is not fully autonomous: its firmware is not
loaded through UART interface but through SDIO/SPI interface, so the
bluetooth description needs a reference to the wlan part to get access
to the corresponding bus.

Signed-off-by: Alexis Lothoré <redacted>
---
 .../net/bluetooth/microchip,wilc3000-bt.yaml       | 41 ++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/bluetooth/microchip,wilc3000-bt.yaml b/Documentation/devicetree/bindings/net/bluetooth/microchip,wilc3000-bt.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..2a83ca3ad90b26fd619b574bc343bee9654a1e43
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/bluetooth/microchip,wilc3000-bt.yaml

@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/bluetooth/microchip,wilc3000-bt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip Bluetooth chips
+
+description:
+  This binding describes UART-attached Microchip bluetooth chips. These
+  chips are dual-radio chips supporting WiFi and Bluetooth. The bluetooth
+  side works with standard HCI commands over 4-wires UART (with flow
+  control)
+
+maintainers:
+  - Alexis Lothoré <alexis.lothore@bootlin.com>
+
+properties:
+  compatible:
+    enum:
+      - microchip,wilc3000-bt
+
+  wlan:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the wlan part of the combo chip