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

[Kendall Willis]

On 9/9/25 03:37, Markus Schneider-Pargmann wrote:
> On Tue Sep 9, 2025 at 10:35 AM CEST, Markus Schneider-Pargmann wrote:
>> 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.
> 
> Nevermind, I just saw your other series, can you please mention the
> other series as a dependency in the cover letter?

Yes, I will make the dependency clear in the cover letter.

> 
>>
>> 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 {
>