Re: [PATCH 3/3] arm64: boot: dts: ti: k3-am62l3-evm: enable WKUP UART wakeup from LPM

Kendall Willis
2026-01-05T22:10:33Z

On 1/5/26 07:55, Nishanth Menon wrote:
> On 20:51-20251230, Kendall Willis wrote:
>> Change the status of the wkup_uart0_interconnect node to enabled. The
>> target-module node sets the UART SYSC and SYSS registers to allow wakeup
>> from WKUP UART in DeepSleep low power mode.
>>
>> Signed-off-by: Kendall Willis <k-willis@ti.com>
>> ---
>> arch/arm64/boot/dts/ti/k3-am62l3-evm.dts | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts b/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts
>> index cae04cce337366b50928d39b0c888550b14e43d3..02b1a1c76b2ee05d49cd69d199a6aacdb1973fa0 100644
>> --- a/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts
>> +++ b/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts
>> @@ -359,3 +359,7 @@ &usb1 {
>> pinctrl-names = "default";
>> pinctrl-0 = <&usb1_default_pins>;
>> };
>> +
>> +&wkup_uart0_interconnect {
>> + status = "okay";
>> +};
>
> don't we need to set status okay and provide pinmux for wkup_uart?
>

No, only the interconnect target node needs to be enabled because it
manages the SYSC register. The SYSC register configures the WKUP_UART to
be able to wakeup the SoC from system suspend. This allows the WKUP_UART
to be wakeup capable even if it is reserved by firmware.

Best,
Kendall

>>
>> --
>> 2.34.1
>>
>