arm64: dts: qcom: x1e80100: Add UART2

GENI SE2 within QUP0 is used as UART on some devices, describe it.
While at it, rewrite the adjacent UART21 pins node to make it more
easily modifiable.

Signed-off-by: Konrad Dybcio <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Andersson <[e-mail]>

arch/arm64/boot/dts/qcom/x1e80100.dtsi

···
 				status = "disabled";
 			};
 
+			uart2: serial@b88000 {
+				compatible = "qcom,geni-uart";
+				reg = <0 0x00b88000 0 0x4000>;
+
+				interrupts = <GIC_SPI 584 IRQ_TYPE_LEVEL_HIGH>;
+
+				clocks = <&gcc GCC_QUPV3_WRAP0_S2_CLK>;
+				clock-names = "se";
+
+				interconnects = <&clk_virt MASTER_QUP_CORE_0 QCOM_ICC_TAG_ALWAYS
+						 &clk_virt SLAVE_QUP_CORE_0 QCOM_ICC_TAG_ALWAYS>,
+						<&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ALWAYS
+						 &config_noc SLAVE_QUP_0 QCOM_ICC_TAG_ALWAYS>;
+				interconnect-names = "qup-core",
+						     "qup-config";
+
+				pinctrl-0 = <&qup_uart2_default>;
+				pinctrl-names = "default";
+
+				status = "disabled";
+			};
+
 			spi2: spi@b88000 {
 				compatible = "qcom,geni-spi";
 				reg = <0 0x00b88000 0 0x4000>;
···
 				bias-disable;
 			};
 
+			qup_uart2_default: qup-uart2-default-state {
+				cts-pins {
+					pins = "gpio8";
+					function = "qup0_se2";
+					drive-strength = <2>;
+					bias-disable;
+				};
+
+				rts-pins {
+					pins = "gpio9";
+					function = "qup0_se2";
+					drive-strength = <2>;
+					bias-disable;
+				};
+
+				tx-pins {
+					pins = "gpio10";
+					function = "qup0_se2";
+					drive-strength = <2>;
+					bias-disable;
+				};
+
+				rx-pins {
+					pins = "gpio11";
+					function = "qup0_se2";
+					drive-strength = <2>;
+					bias-disable;
+				};
+			};
+
 			qup_uart21_default: qup-uart21-default-state {
-				/* TX, RX */
-				pins = "gpio86", "gpio87";
-				function = "qup2_se5";
-				drive-strength = <2>;
-				bias-disable;
+				tx-pins {
+					pins = "gpio86";
+					function = "qup2_se5";
+					drive-strength = <2>;
+					bias-disable;
+				};
+
+				rx-pins {
+					pins = "gpio87";
+					function = "qup2_se5";
+					drive-strength = <2>;
+					bias-disable;
+				};
 			};
 		};