[PATCH 1/3] arm64: dts: ti: k3-am62x-sk-common: Enable Main UART wakeup

[Markus Schneider-Pargmann]

On Thu Sep 4, 2025 at 11:28 PM CEST, Kendall Willis wrote:
> 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 at ti.com>
> ---
>  .../arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 24 +++++++++++++++----
>  1 file changed, 20 insertions(+), 4 deletions(-)
>
> 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 13e1d36123d51..72801cf890d20 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> @@ -163,14 +163,26 @@ &phy_gmii_sel {
>  
>  &main_pmx0 {
>  	/* First pad number is ALW package and second is AMC package */
> -	main_uart0_pins_default: main-uart0-default-pins {
> +	main_uart0_tx_pins_default: main-uart0-tx-default-pins {
>  		bootph-all;
>  		pinctrl-single,pins = <
> -			AM62X_IOPAD(0x1c8, PIN_INPUT, 0) /* (D14/A13) UART0_RXD */
>  			AM62X_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (E14/E11) UART0_TXD */
>  		>;
>  	};
>  
> +	main_uart0_rx_pins_default: main-uart0-rx-default-pins {
> +		bootph-all;
> +		pinctrl-single,pins = <
> +			AM62X_IOPAD(0x1c8, PIN_INPUT, 0) /* (D14/A13) UART0_RXD */
> +		>;
> +	};
> +
> +	main_uart0_rx_pins_wakeup: main-uart0-rx-wakeup-pins {
> +		pinctrl-single,pins = <
> +			AM62X_IOPAD(0x1c8, PIN_INPUT | PIN_WKUP_EN, 0) /* (D14/A13) UART0_RXD */
> +		>;
> +	};
> +
>  	main_uart1_pins_default: main-uart1-default-pins {
>  		bootph-pre-ram;
>  		pinctrl-single,pins = <
> @@ -342,8 +354,12 @@ &wkup_uart0 {
>  &main_uart0 {
>  	bootph-all;
>  	status = "okay";
> -	pinctrl-names = "default";
> -	pinctrl-0 = <&main_uart0_pins_default>;
> +	pinctrl-names = "default", "wakeup";

I think you may need to add this to the DT binding of the uart device
as well.

Best
Markus

> +	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>;
>  };
>  
>  &main_uart1 {

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