linux-kernel - [PATCH 2/3] arm64: dts: ti: k3-am62a7-sk: Enable Main UART wakeup

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Message-ID: <20250904212827.3730314-3-k-willis@ti.com>
Date: Thu, 4 Sep 2025 16:28:26 -0500
From: Kendall Willis <k-willis@...com>
To: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: <d-gole@...com>, <vishalm@...com>, <sebin.francis@...com>,
        <msp@...libre.com>, <khilman@...libre.com>, <a-kaur@...com>,
        <k-willis@...com>
Subject: [PATCH 2/3] arm64: dts: ti: k3-am62a7-sk: Enable Main UART wakeup

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@...com>
---
 arch/arm64/boot/dts/ti/k3-am62a7-sk.dts | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
index bceead5e288e6..1c0ef563750c8 100644
--- a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
@@ -294,14 +294,26 @@ AM62AX_IOPAD(0x078, PIN_OUTPUT, 1) /* (T21) GPMC0_AD15.VOUT0_DATA23 */
 		>;
 	};
 
-	main_uart0_pins_default: main-uart0-default-pins {
+	main_uart0_tx_pins_default: main-uart0-tx-default-pins {
 		pinctrl-single,pins = <
-			AM62AX_IOPAD(0x1c8, PIN_INPUT, 0) /* (E14) UART0_RXD */
 			AM62AX_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (D15) UART0_TXD */
 		>;
 		bootph-all;
 	};
 
+	main_uart0_rx_pins_default: main-uart0-rx-default-pins {
+		pinctrl-single,pins = <
+			AM62AX_IOPAD(0x1c8, PIN_INPUT, 0) /* (E14) UART0_RXD */
+		>;
+		bootph-all;
+	};
+
+	main_uart0_rx_pins_wakeup: main-uart0-rx-wakeup-pins {
+		pinctrl-single,pins = <
+			AM62AX_IOPAD(0x1c8, PIN_INPUT | PIN_WKUP_EN, 0) /* (E14) UART0_RXD */
+		>;
+	};
+
 	main_uart1_pins_default: main-uart1-default-pins {
 		pinctrl-single,pins = <
 			AM62AX_IOPAD(0x01ac, PIN_INPUT, 2) /* (B21) MCASP0_AFSR.UART1_RXD */
@@ -701,8 +713,12 @@ &main_gpio_intr {
 
 &main_uart0 {
 	status = "okay";
-	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>;
 	bootph-all;
 };
 
-- 
2.34.1