[PATCH v7] dt-bindings: net: mediatek,mt7925-bluetooth.yaml

[Zhangchao Zhang <ot_zhangchao.zhang@mediatek.com>]

Reset BT via BT_KILL_1V2_L hardware pin.

On the M.2 standard hardware pin interface, the MTK chip
has a pin called BT_KILL_1V2_L or W_DISABLE#2, it uses
function-level device reset (FLDR) to reset Bluetooth.
When it is pulled low, it can external shut down the BT
function, it is defined as 5 on the MT7925 chip, and is
defined as 248 on the device tree pio controller.

Signed-off-by: Zhangchao Zhang <ot_zhangchao.zhang@mediatek.com>
---
 .../bluetooth/mediatek,mt7925-bluetooth.yaml  | 47 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 48 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7925-bluetooth.yaml

diff --git a/Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7925-bluetooth.yaml b/Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7925-bluetooth.yaml
new file mode 100644
index 000000000000..dd24312735e0
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7925-bluetooth.yaml
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/bluetooth/mediatek,mt7925-bluetooth.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bluetooth mediatek use BT_KILL_1V2_L hardware pin to reset BT
+
+maintainers:
+  - Sean Wang <sean.wang@mediatek.com>
+
+description:
+  MT7925 modules provides hardware pin called W_DISABLE#2 to reset Bluetotoh,
+  two methods are used to reset Bluetooth. When an exception occurs, resetting
+  Bluetooth by hardware pin is more stable than resetting Bluetooth by software.
+
+allOf:
+  - $ref: bluetooth-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt7925-bluetooth
+
+  reset-gpios:
+    maxItems: 1
+    description:
+      This pin can is used to externally reset BT function. When pull low,
+      the Bluetooth and USB interface will be also disabled. After 100ms,
+      it is pulled high to 3.3V to re_enable the device and trigger the
+      next probe. This is typically used on M.2 key E modules.
+
+required:
+  - compatible
+  - reset-gpios
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    bluetooth {
+      compatible = "mediatek,mt7925-bluetooth";
+      #gpio-cells = <2>;
+      reset-gpios = <&pio 248 GPIO_ACTIVE_LOW>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 5959513a7359..d104a5821f20 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14676,6 +14676,7 @@ L:	linux-mediatek@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	Documentation/devicetree/bindings/net/bluetooth/mediatek,bluetooth.txt
 F:	Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7921s-bluetooth.yaml
+F:	Documentation/devicetree/bindings/net/bluetooth/mediatek,mt7925-bluetooth.yaml
 F:	drivers/bluetooth/btmtkuart.c
 
 MEDIATEK BOARD LEVEL SHUTDOWN DRIVERS
-- 
2.45.2