[PATCH v3 2/5] arm64: dts: ti: k3-am62x-sk-common: Enable Main UART wakeup
From: Kendall Willis <hidden>
Date: 2026-01-07 00:42:49
Also in:
linux-arm-kernel, lkml
Subsystem:
arm/texas instruments k3 architecture, the rest · Maintainers:
Nishanth Menon, Vignesh Raghavendra, Tero Kristo, Linus Torvalds
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. The UART driver uses the "default" pinctrl state when the system is active. In the suspend hook, if the UART is wakeup enabled, the "wakeup" pinctrl state is selected by the UART driver in order to allow wakeup. Upon resume, the default pinctrl state is selected again. Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com> Reviewed-by: Dhruva Gole <redacted> Signed-off-by: Kendall Willis <redacted> --- arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
index 50ed859ae06c47af38b11753d909a91485d438e5..ab9e58c2d225eb44c054d984aad8f0bed92bf7e9 100644
--- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi@@ -151,6 +151,13 @@ AM62X_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (E14/E11) UART0_TXD */ >; }; + main_uart0_pins_wakeup: main-uart0-wakeup-pins { + pinctrl-single,pins = < + AM62X_IOPAD(0x1c8, PIN_INPUT | PIN_WKUP_EN, 0) /* (D14/A13) UART0_RXD */ + AM62X_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (E14/E11) UART0_TXD */ + >; + }; + main_uart1_pins_default: main-uart1-default-pins { bootph-pre-ram; pinctrl-single,pins = <
@@ -322,8 +329,12 @@ &wkup_uart0 { &main_uart0 { bootph-all; status = "okay"; - pinctrl-names = "default"; + pinctrl-names = "default", "wakeup"; pinctrl-0 = <&main_uart0_pins_default>; + pinctrl-1 = <&main_uart0_pins_wakeup>; + wakeup-source = <&system_deep_sleep>, + <&system_mcu_only>, + <&system_standby>; }; &main_uart1 {
--
2.34.1