arm64: dts: ti: k3-am62a7-sk: Add interrupt support for IO Expander

The Hot Plug Detect (HPD) signal for the HDMI display travels from the
on-board HDMI connector, through the IO Expander 1, and finally to the
main_gpio1 GPIO 23, of the SoC.

Add interrupt information for the IO Expander 1 (exp1) along with the
relevant pinmux.
Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
Reviewed-by: Jai Luthra <j-luthra@ti.com>
Link: https://lore.kernel.org/r/20231108191652.1118155-1-a-bhatia1@ti.comSigned-off-by: Nishanth Menon <nm@ti.com>

arch/arm64/boot/dts/ti/k3-am62a7-sk.dts

@@ -274,6 +274,12 @@ AM62AX_IOPAD(0x08c, PIN_OUTPUT, 2) /* (K19) GPMC0_WEn.MCASP1_AXR0 */
 			AM62AX_IOPAD(0x084, PIN_INPUT, 2) /* (L18) GPMC0_ADVn_ALE.MCASP1_AXR2 */
 		>;
 	};
+
+	main_gpio1_ioexp_intr_pins_default: main-gpio1-ioexp-intr-default-pins {
+		pinctrl-single,pins = <
+			AM62AX_IOPAD(0x01d4, PIN_INPUT, 7) /* (C15) UART0_RTSn.GPIO1_23 */
+		>;
+	};
 };
 
 &mcu_pmx0 {
@@ -407,6 +413,12 @@ exp1: gpio@22 {
 		reg = <0x22>;
 		gpio-controller;
 		#gpio-cells = <2>;
+		interrupt-parent = <&main_gpio1>;
+		interrupts = <23 IRQ_TYPE_EDGE_FALLING>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&main_gpio1_ioexp_intr_pins_default>;
 
 		gpio-line-names = "GPIO_CPSW2_RST", "GPIO_CPSW1_RST",
 				   "BT_EN_SOC", "MMC1_SD_EN",