linux-kernel - [PATCH v2 5/5] arm64: dts: ti: k3-am62l3-evm: Enable Main UART wakeup

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Message-ID: <20251230-b4-uart-daisy-chain-dts-v2-5-fa5257ec54bb@ti.com>
Date: Tue, 30 Dec 2025 20:38:24 -0600
From: Kendall Willis <k-willis@...com>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, "Tero
 Kristo" <kristo@...nel.org>, Rob Herring <robh@...nel.org>, "Krzysztof
 Kozlowski" <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
CC: <d-gole@...com>, <vishalm@...com>, <sebin.francis@...com>,
	<msp@...libre.com>, <khilman@...libre.com>, <a-kaur@...com>,
	<s-kochidanadu@...com>, <linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Kendall Willis
	<k-willis@...com>
Subject: [PATCH v2 5/5] arm64: dts: ti: k3-am62l3-evm: 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-am62l3-evm.dts | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts b/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts
index cae04cce337366b50928d39b0c888550b14e43d3..911719278e7191d96a886ce1e818f98085dd5d67 100644
--- a/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts
@@ -280,14 +280,26 @@ AM62LX_IOPAD(0x0234, PIN_INPUT, 0) /* (B6) MMC1_SDCD */
 		bootph-all;
 	};
 
-	uart0_pins_default: uart0-default-pins {
+	uart0_tx_pins_default: uart0-tx-default-pins {
 		pinctrl-single,pins = <
-			AM62LX_IOPAD(0x01b4, PIN_INPUT, 0) /* (D13) UART0_RXD */
 			AM62LX_IOPAD(0x01b8, PIN_OUTPUT, 0) /* (C13) UART0_TXD */
 		>;
 		bootph-all;
 	};
 
+	uart0_rx_pins_default: uart0-rx-default-pins {
+		pinctrl-single,pins = <
+			AM62LX_IOPAD(0x01b4, PIN_INPUT, 0) /* (D13) UART0_RXD */
+		>;
+		bootph-all;
+	};
+
+	uart0_rx_pins_wakeup: uart0-rx-wakeup-pins {
+		pinctrl-single,pins = <
+			AM62LX_IOPAD(0x01b4, PIN_INPUT | PIN_WKUP_EN, 0) /* (D13) UART0_RXD */
+		>;
+	};
+
 	usb1_default_pins: usb1-default-pins {
 		pinctrl-single,pins = <
 			AM62LX_IOPAD(0x0248, PIN_INPUT | PIN_DS_PULLUD_ENABLE | PIN_DS_PULL_UP, 0) /* (A5) USB1_DRVVBUS */
@@ -328,8 +340,10 @@ &sdhci1 {
 };
 
 &uart0 {
-	pinctrl-0 = <&uart0_pins_default>;
-	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_tx_pins_default>, <&uart0_rx_pins_default>;
+	pinctrl-1 = <&uart0_tx_pins_default>, <&uart0_rx_pins_wakeup>;
+	pinctrl-names = "default", "wakeup";
+	wakeup-source  = <&system_deep_sleep>;
 	status = "okay";
 	bootph-all;
 };

-- 
2.34.1