Re: [PATCH v2 4/5] arm64: dts: ti: k3-am62p5-sk: Enable Main UART wakeup
From: Nishanth Menon <nm@ti.com>
Date: 2026-01-05 13:52:09
Also in:
linux-arm-kernel, lkml
On 20:38-20251230, 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.
Is the tx and rx pin register states both lost? I wonder why during "wakeup" we set PIN_WKUP_EN ? is'nt that supposed to be set while entering "suspend" state? if the tx pin register state is not lost, then all we need to do is play with the rx pin state (and leave pinctrl-0 as is)?
quoted hunk ↗ jump to hunk
Signed-off-by: Kendall Willis <redacted> --- arch/arm64/boot/dts/ti/k3-am62p5-sk.dts | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-)diff --git a/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts b/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts index ef719c6334fc094f01d9e8185992f2f58320e17d..96bba65f4f16792834567324db6f7f2bdee7bc06 100644 --- a/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts +++ b/arch/arm64/boot/dts/ti/k3-am62p5-sk.dts@@ -328,14 +328,26 @@ AM62PX_IOPAD(0x0164, PIN_INPUT, 0) /* (A20) RGMII2_TX_CTL */ bootph-all; }; - main_uart0_pins_default: main-uart0-default-pins { + main_uart0_tx_pins_default: main-uart0-tx-default-pins { pinctrl-single,pins = < - AM62PX_IOPAD(0x1c8, PIN_INPUT, 0) /* (A22) UART0_RXD */ AM62PX_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (B22) UART0_TXD */ >; bootph-all; }; + main_uart0_rx_pins_default: main-uart0-rx-default-pins { + pinctrl-single,pins = < + AM62PX_IOPAD(0x1c8, PIN_INPUT, 0) /* (A22) UART0_RXD */ + >; + bootph-all; + }; + + main_uart0_rx_pins_wakeup: main-uart0-rx-wakeup-pins { + pinctrl-single,pins = < + AM62PX_IOPAD(0x1c8, PIN_INPUT | PIN_WKUP_EN, 0) /* (A22) UART0_RXD */ + >; + }; + main_uart1_pins_default: main-uart1-default-pins { pinctrl-single,pins = < AM62PX_IOPAD(0x0194, PIN_INPUT, 2) /* (D25) MCASP0_AXR3.UART1_CTSn */@@ -692,8 +704,12 @@ partition@3fc0000 { }; &main_uart0 { - pinctrl-names = "default"; - pinctrl-0 = <&main_uart0_pins_default>; + pinctrl-names = "default", "wakeup"; + 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>; status = "okay"; bootph-all; };-- 2.34.1
-- Regards, Nishanth Menon Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3 1A34 DDB5 849D 1736 249D https://ti.com/opensource