arm64: dts: qcom: sm8450: add uart20 node

Add device tree node for uart20, which is typically used for Bluetooth attachment.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220502195133.275209-1-dmitry.baryshkov@linaro.org

arch/arm64/boot/dts/qcom/sm8450.dtsi

@@ -976,6 +976,19 @@ i2c20: i2c@894000 {
 				status = "disabled";
 			};
 
+			uart20: serial@894000 {
+				compatible = "qcom,geni-uart";
+				reg = <0 0x00894000 0 0x4000>;
+				clock-names = "se";
+				clocks = <&gcc GCC_QUPV3_WRAP2_S5_CLK>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&qup_uart20_default>;
+				interrupts = <GIC_SPI 587 IRQ_TYPE_LEVEL_HIGH>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+				status = "disabled";
+			};
+
 			spi20: spi@894000 {
 				compatible = "qcom,geni-spi";
 				reg = <0 0x00894000 0 0x4000>;
@@ -2738,6 +2751,12 @@ qup_uart7_tx: qup-uart7-tx {
 				drive-strength = <2>;
 				bias-disable;
 			};
+
+			qup_uart20_default: qup-uart20-default {
+				pins = "gpio76", "gpio77", "gpio78", "gpio79";
+				function = "qup20";
+			};
+
 		};
 
 		apps_smmu: iommu@15000000 {