dt-bindings: net: bluetooth: Add mediatek-bluetooth

Add binding document for a SoC built-in device using MediaTek protocol.
Which could be found on MT7622 SoC or other similar MediaTek SoCs.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/Documentation/devicetree/bindings/net/mediatek-bluetooth.txt b/Documentation/devicetree/bindings/net/mediatek-bluetooth.txt
new file mode 100644 (file)
index 0000000..14ceb2a
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/mediatek-bluetooth.txt
@@ -0,0 +1,35 @@
+MediaTek SoC built-in Bluetooth Devices
+==================================
+
+This device is a serial attached device to BTIF device and thus it must be a
+child node of the serial node with BTIF. The dt-bindings details for BTIF
+device can be known via Documentation/devicetree/bindings/serial/8250.txt.
+
+Required properties:
+
+- compatible:  Must be
+                 "mediatek,mt7622-bluetooth": for MT7622 SoC
+- clocks:      Should be the clock specifiers corresponding to the entry in
+               clock-names property.
+- clock-names: Should contain "ref" entries.
+- power-domains: Phandle to the power domain that the device is part of
+
+Example:
+
+       btif: serial@1100c000 {
+               compatible = "mediatek,mt7622-btif",
+                            "mediatek,mtk-btif";
+               reg = <0 0x1100c000 0 0x1000>;
+               interrupts = <GIC_SPI 90 IRQ_TYPE_LEVEL_LOW>;
+               clocks = <&pericfg CLK_PERI_BTIF_PD>;
+               clock-names = "main";
+               reg-shift = <2>;
+               reg-io-width = <4>;
+
+               bluetooth {
+                       compatible = "mediatek,mt7622-bluetooth";
+                       power-domains = <&scpsys MT7622_POWER_DOMAIN_WB>;
+                       clocks = <&clk25m>;
+                       clock-names = "ref";
+               };
+       };