arm64: dts: apq8096-db820c: enable bluetooth node

Add a new serial node for the Qualcomm BT controller QCA6174. This
allows automatic probing and hci registration through the serdev
framework instead of relying on the userspace helpers.
Signed-off-by: Thierry Escande <thierry.escande@linaro.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

arch/arm64/boot/dts/qcom/apq8096-db820c-pins.dtsi

@@ -36,4 +36,30 @@ config {
 			drive-strength = <2>;	/* 2 MA */
 		};
 	};
+
+	blsp1_uart1_default: blsp1_uart1_default {
+		mux {
+			pins = "gpio41", "gpio42", "gpio43", "gpio44";
+			function = "blsp_uart2";
+		};
+
+		config {
+			pins = "gpio41", "gpio42", "gpio43", "gpio44";
+			drive-strength = <16>;
+			bias-disable;
+		};
+	};
+
+	blsp1_uart1_sleep: blsp1_uart1_sleep {
+		mux {
+			pins = "gpio41", "gpio42", "gpio43", "gpio44";
+			function = "gpio";
+		};
+
+		config {
+			pins = "gpio41", "gpio42", "gpio43", "gpio44";
+			drive-strength = <2>;
+			bias-disable;
+		};
+	};
 };

arch/arm64/boot/dts/qcom/apq8096-db820c-pmic-pins.dtsi

@@ -48,6 +48,16 @@ pinconf {
 		};
 	};
 
+	divclk4_pin_a: divclk4 {
+		pinconf {
+			pins = "gpio18";
+			function = PMIC_GPIO_FUNC_FUNC2;
+
+			bias-disable;
+			power-source = <PM8994_GPIO_S4>;
+		};
+	};
+
 	usb3_vbus_det_gpio: pm8996_gpio22 {
 		pinconf {
 			pins = "gpio22";

arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi

@@ -23,6 +23,7 @@ / {
 	aliases {
 		serial0 = &blsp2_uart1;
 		serial1 = &blsp2_uart2;
+		serial2 = &blsp1_uart1;
 		i2c0	= &blsp1_i2c2;
 		i2c1	= &blsp2_i2c1;
 		i2c2	= &blsp2_i2c0;
@@ -34,7 +35,36 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
+	clocks {
+		divclk4: divclk4 {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <32768>;
+			clock-output-names = "divclk4";
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&divclk4_pin_a>;
+		};
+	};
+
 	soc {
+		serial@7570000 {
+			label = "BT-UART";
+			status = "okay";
+			pinctrl-names = "default", "sleep";
+			pinctrl-0 = <&blsp1_uart1_default>;
+			pinctrl-1 = <&blsp1_uart1_sleep>;
+
+			bluetooth {
+				compatible = "qcom,qca6174-bt";
+
+				/* bt_disable_n gpio */
+				enable-gpios = <&pm8994_gpios 19 GPIO_ACTIVE_HIGH>;
+
+				clocks = <&divclk4>;
+			};
+		};
+
 		serial@75b0000 {
 			label = "LS-UART1";
 			status = "okay";

arch/arm64/boot/dts/qcom/msm8996.dtsi

@@ -419,6 +419,16 @@ kryocc: clock-controller@6400000 {
 			#clock-cells = <1>;
 		};
 
+		blsp1_uart1: serial@7570000 {
+			compatible = "qcom,msm-uartdm-v1.4", "qcom,msm-uartdm";
+			reg = <0x07570000 0x1000>;
+			interrupts = <GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&gcc GCC_BLSP1_UART2_APPS_CLK>,
+				 <&gcc GCC_BLSP1_AHB_CLK>;
+			clock-names = "core", "iface";
+			status = "disabled";
+		};
+
 		blsp1_spi0: spi@7575000 {
 			compatible = "qcom,spi-qup-v2.2.1";
 			reg = <0x07575000 0x600>;