dt-bindings: net: bluetooth: add support for MediaTek MT7663U and MT7668U UART devices

Update binding document with adding support of MT7663U and MT7668U UART
devices to mediatek-bluetooth.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
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
index 14ceb2a5b4e81d242f48b58c4e64f0bdab043c34..41a7dcc80f5b6f3d4fd6802c306daae424254995 100644 (file)
--- a/Documentation/devicetree/bindings/net/mediatek-bluetooth.txt
+++ b/Documentation/devicetree/bindings/net/mediatek-bluetooth.txt
@@ -33,3 +33,67 @@ Example:
                        clock-names = "ref";
                };
        };
+
+MediaTek UART based Bluetooth Devices
+==================================
+
+This device is a serial attached device to UART device and thus it must be a
+child node of the serial node with UART.
+
+Please refer to the following documents for generic properties:
+
+       Documentation/devicetree/bindings/serial/slave-device.txt
+
+Required properties:
+
+- compatible:  Must be
+                 "mediatek,mt7663u-bluetooth": for MT7663U device
+                 "mediatek,mt7668u-bluetooth": for MT7668U device
+- vcc-supply:  Main voltage regulator
+- pinctrl-names: Should be "default", "runtime"
+- pinctrl-0: Should contain UART RXD low when the device is powered up to
+            enter proper bootstrap mode.
+- pinctrl-1: Should contain UART mode pin ctrl
+
+Optional properties:
+
+- reset-gpios: GPIO used to reset the device whose initial state keeps low,
+               if the GPIO is missing, then board-level design should be
+               guaranteed.
+- current-speed:  Current baud rate of the device whose defaults to 921600
+
+Example:
+
+       uart1_pins_boot: uart1-default {
+               pins-dat {
+                       pinmux = <MT7623_PIN_81_URXD1_FUNC_GPIO81>;
+                       output-low;
+               };
+       };
+
+       uart1_pins_runtime: uart1-runtime {
+               pins-dat {
+                       pinmux = <MT7623_PIN_81_URXD1_FUNC_URXD1>,
+                                <MT7623_PIN_82_UTXD1_FUNC_UTXD1>;
+               };
+       };
+
+       uart1: serial@11003000 {
+               compatible = "mediatek,mt7623-uart",
+                            "mediatek,mt6577-uart";
+               reg = <0 0x11003000 0 0x400>;
+               interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_LOW>;
+               clocks = <&pericfg CLK_PERI_UART1_SEL>,
+                        <&pericfg CLK_PERI_UART1>;
+               clock-names = "baud", "bus";
+
+               bluetooth {
+                       compatible = "mediatek,mt7663u-bluetooth";
+                       vcc-supply = <&reg_5v>;
+                       reset-gpios = <&pio 24 GPIO_ACTIVE_LOW>;
+                       pinctrl-names = "default", "runtime";
+                       pinctrl-0 = <&uart1_pins_boot>;
+                       pinctrl-1 = <&uart1_pins_runtime>;
+                       current-speed = <921600>;
+               };
+       };