The Main UART can resume from suspend to RAM states when PIN_WKUP_EN
is enabled. Add the necessary pins needed to wakeup the system. Add the
system idle states that the Main UART can wakeup the system from.

Signed-off-by: Kendall Willis <k-willis@ti.com>
---
 arch/arm64/boot/dts/ti/k3-am62p5-sk.dts | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts b/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts
index 899da7896563b..1857437eb9c34 100644
--- a/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts
@@ -340,14 +340,26 @@ AM62PX_IOPAD(0x0164, PIN_INPUT, 0) /* (A20) RGMII2_TX_CTL */
 		bootph-all;
 	};
 
-	main_uart0_pins_default: main-uart0-default-pins {
+	main_uart0_tx_pins_default: main-uart0-tx-default-pins {
 		pinctrl-single,pins = <
-			AM62PX_IOPAD(0x1c8, PIN_INPUT, 0)	/* (A22) UART0_RXD */
 			AM62PX_IOPAD(0x1cc, PIN_OUTPUT, 0)	/* (B22) UART0_TXD */
 		>;
 		bootph-all;
 	};
 
+	main_uart0_rx_pins_default: main-uart0-rx-default-pins {
+		pinctrl-single,pins = <
+			AM62PX_IOPAD(0x1c8, PIN_INPUT, 0)	/* (A22) UART0_RXD */
+		>;
+		bootph-all;
+	};
+
+	main_uart0_rx_pins_wakeup: main-uart0-rx-wakeup-pins {
+		pinctrl-single,pins = <
+			AM62PX_IOPAD(0x1c8, PIN_INPUT | PIN_WKUP_EN, 0)	/* (A22) UART0_RXD */
+		>;
+	};
+
 	main_uart1_pins_default: main-uart1-default-pins {
 		pinctrl-single,pins = <
 			AM62PX_IOPAD(0x0194, PIN_INPUT, 2) /* (D25) MCASP0_AXR3.UART1_CTSn */
@@ -738,8 +750,12 @@ &mcu_r5fss0_core0 {
 };
 
 &main_uart0 {
-	pinctrl-names = "default";
-	pinctrl-0 = <&main_uart0_pins_default>;
+	pinctrl-names = "default", "wakeup";
+	pinctrl-0 = <&main_uart0_tx_pins_default>, <&main_uart0_rx_pins_default>;
+	pinctrl-1 = <&main_uart0_tx_pins_default>, <&main_uart0_rx_pins_wakeup>;
+	wakeup-source = <&system_deep_sleep>,
+			<&system_mcu_only>,
+			<&system_standby>;
 	status = "okay";
 	bootph-all;
 };
-- 
2.34.1