This patch is to add Bluetooth to the ASUS Tinker Board (S) device tree. This patch is more contraversal - so probably view it as a request for comments. The reason behind this, is this patch does not currently set Bluetooth working on the these boards. The problem is that the bluetooth/hci_h5.c driver, that is used for Realtek serial devices, depends on ACPI. Unfortantly ACPI can not be enabled on armv7 machines such as the TB(S). And so the kernel module for the RTL8723BS Bluetooth can not be loaded. However this patch is believed to be an accurate description of the Tinker Board (S) wiring. It is strongly based on the ASUS patch: https://github.com/TinkerBoard/debian_kernel/commit/6a3128ade33f758887048578ada61a4b7ab8e678 As the Bluetooth is connected via a UART and this is wired into uart0, this has been described as a SerDev. The ASUS patch mentions the UART_CTS, but not the _RTS. Now as the RTL8723BS has both CTS and RTS on the uart, it has been assumed both are wired into uart0 on the cpu. The Bluetooth connection has several wake up pins both device and host and a reset pin. The wiring of these has been described; however how the kernel driver will use these isn't clear. E.g. should HOST_WAKE be an interupt? The main reason for asking for comments, is that when it comes time to make the changes to the bluetooth uart code, and add compatible flags, robh has indicated that this will only be accepted with a valid example. So the code below is that example. So I would like comments that this approach is valid, which can be used when the later submission comes. Signed-off-by: David Summers <beagleboard@xxxxxxxxxxxxxxxxxxx> --- arch/arm/boot/dts/rk3288-tinker.dtsi | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/arm/boot/dts/rk3288-tinker.dtsi b/arch/arm/boot/dts/rk3288-tinker.dtsi index e1796f340eef..931b4c652fdc 100644 --- a/arch/arm/boot/dts/rk3288-tinker.dtsi +++ b/arch/arm/boot/dts/rk3288-tinker.dtsi @@ -481,6 +481,17 @@ &uart0 { status = "okay"; + pinctrl-names = "default"; + pinctrl-0 = <&uart0_xfer>, <&uart0_cts>, <&uart0_rts>; + + bluetooth { + clocks = <&rk808 RK808_CLKOUT1>; + reset-gpios = <&gpio4 RK_PD5 GPIO_ACTIVE_LOW>; + device-wake-gpios = <&gpio4 RK_PD2 GPIO_ACTIVE_HIGH>; + host-wake-gpios = <&gpio4 RK_PD7 GPIO_ACTIVE_HIGH>; + vcc-18-supply = <&vcc_18>; + vcc-io-supply = <&vcc_io>; + }; }; &uart1 { -- beagleboard@xxxxxxxxxxxxxxxxxxx
