new file mode 100644
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/bluetooth/mediatek,mt7921s-bluetooth.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek MT7921S Bluetooth
+
+description:
+ This binding describes the Bluetooth side of the SDIO-attached MT7921S
+ WiFi+Bluetooth combo chips. These chips are dual-radio chips supporting
+ WiFi and Bluetooth. Bluetooth works over SDIO just like WiFi. Bluetooth
+ has its own reset line, separate from WiFi, which can be used to reset
+ the Bluetooth core.
+
+maintainers:
+ - Sean Wang <sean.wang@mediatek.com>
+
+properties:
+ compatible:
+ enum:
+ - mediatek,mt7921s-bluetooth
+ reg:
+ const: 2
+
+ reset-gpios:
+ maxItems: 1
+ description: A GPIO line connected to the Bluetooth subsystem reset line.
+ Typically the W_DISABLE2# pin on M.2 E-key modules. If present this
+ shall be flagged as active low.
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ mmc {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ bluetooth@2 {
+ compatible = "mediatek,mt7921s-bluetooth";
+ reg = <2>;
+ reset-gpios = <&pio 8 GPIO_ACTIVE_LOW>;
+ };
+ };
@@ -13657,6 +13657,7 @@ M: Sean Wang <sean.wang@mediatek.com>
L: linux-bluetooth@vger.kernel.org
L: linux-mediatek@lists.infradead.org (moderated for non-subscribers)
S: Maintained
+F: Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7921s-bluetooth.yaml
F: Documentation/devicetree/bindings/net/mediatek-bluetooth.txt
F: drivers/bluetooth/btmtkuart.c
The MediaTek MT7921S is a WiFi/Bluetooth combo chip that works over SDIO. While the Bluetooth function is fully discoverable, the chip has a pin that can reset just the Bluetooth side, as opposed to the full chip. This needs to be described in the device tree. Add a device tree binding for MT7921S Bluetooth over SDIO specifically ot document the reset line. Cc: Sean Wang <sean.wang@mediatek.com> Signed-off-by: Chen-Yu Tsai <wenst@chromium.org> --- .../bluetooth/mediatek,mt7921s-bluetooth.yaml | 49 +++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 50 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7921s-bluetooth.yaml