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From: Chen-Yu Tsai <wenst@chromium.org>
To: Marcel Holtmann <marcel@holtmann.org>,
	Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Chen-Yu Tsai <wenst@chromium.org>,
	Sean Wang <sean.wang@mediatek.com>,
	linux-bluetooth@vger.kernel.org,
	netdev@vger.kernel.org,
	linux-mediatek@lists.infradead.org,
	devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] dt-bindings: net: bluetooth: Add MediaTek MT7921S SDIO Bluetooth
Date: Thu, 25 Jan 2024 17:52:37 +0800
Message-ID: <20240125095240.2308340-2-wenst@chromium.org>
In-Reply-To: <20240125095240.2308340-1-wenst@chromium.org>
References: <20240125095240.2308340-1-wenst@chromium.org>
Precedence: bulk
MIME-Version: 1.0
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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

diff --git a/Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7921s-bluetooth.yaml b/Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7921s-bluetooth.yaml
new file mode 100644
index 000000000000..bbe240e7cc40
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7921s-bluetooth.yaml
@@ -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>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index b64a64ca7916..662957146852 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -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
 
-- 
2.43.0.429.g432eaa2c6b-goog