Re: [PATCH 1/3] arm64: dts: ti: k3-am62x-sk-common: Enable Main UART wakeup
From: "Markus Schneider-Pargmann" <msp@baylibre.com>
Date: 2025-09-09 08:35:37
Also in:
linux-arm-kernel, lkml
On Thu Sep 4, 2025 at 11:28 PM CEST, Kendall Willis wrote:
quoted hunk ↗ jump to hunk
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 <redacted> --- .../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 {Attachments
- signature.asc [application/pgp-signature] 289 bytes