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1MediaTek UART based Bluetooth Devices2==================================3 4This device is a serial attached device to UART device and thus it must be a5child node of the serial node with UART.6 7Please refer to the following documents for generic properties:8 9 Documentation/devicetree/bindings/serial/serial.yaml10 11Required properties:12 13- compatible: Must be14 "mediatek,mt7663u-bluetooth": for MT7663U device15 "mediatek,mt7668u-bluetooth": for MT7668U device16- vcc-supply: Main voltage regulator17 18If the pin controller on the platform can support both pinmux and GPIO19control such as the most of MediaTek platform. Please use below properties.20 21- pinctrl-names: Should be "default", "runtime"22- pinctrl-0: Should contain UART RXD low when the device is powered up to23 enter proper bootstrap mode.24- pinctrl-1: Should contain UART mode pin ctrl25 26Else, the pin controller on the platform only can support pinmux control and27the GPIO control still has to rely on the dedicated GPIO controller such as28a legacy MediaTek SoC, MT7621. Please use the below properties.29 30- boot-gpios: GPIO same to the pin as UART RXD and used to keep LOW when31 the device is powered up to enter proper bootstrap mode when32- pinctrl-names: Should be "default"33- pinctrl-0: Should contain UART mode pin ctrl34 35Optional properties:36 37- reset-gpios: GPIO used to reset the device whose initial state keeps low,38 if the GPIO is missing, then board-level design should be39 guaranteed.40- clocks: Should be the clock specifiers corresponding to the entry in41 clock-names property. If the clock is missing, then board-level42 design should be guaranteed.43- clock-names: Should contain "osc" entry for the external oscillator.44- current-speed: Current baud rate of the device whose defaults to 92160045 46Example:47 48 uart1_pins_boot: uart1-default {49 pins-dat {50 pinmux = <MT7623_PIN_81_URXD1_FUNC_GPIO81>;51 output-low;52 };53 };54 55 uart1_pins_runtime: uart1-runtime {56 pins-dat {57 pinmux = <MT7623_PIN_81_URXD1_FUNC_URXD1>,58 <MT7623_PIN_82_UTXD1_FUNC_UTXD1>;59 };60 };61 62 uart1: serial@11003000 {63 compatible = "mediatek,mt7623-uart",64 "mediatek,mt6577-uart";65 reg = <0 0x11003000 0 0x400>;66 interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_LOW>;67 clocks = <&pericfg CLK_PERI_UART1_SEL>,68 <&pericfg CLK_PERI_UART1>;69 clock-names = "baud", "bus";70 71 bluetooth {72 compatible = "mediatek,mt7663u-bluetooth";73 vcc-supply = <®_5v>;74 reset-gpios = <&pio 24 GPIO_ACTIVE_LOW>;75 pinctrl-names = "default", "runtime";76 pinctrl-0 = <&uart1_pins_boot>;77 pinctrl-1 = <&uart1_pins_runtime>;78 current-speed = <921600>;79 };80 };81