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

[Kendall Willis]

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@xxxxxx>
> > ---
> >   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