On 1/6/26 18:42, Kendall Willis wrote:
> This series adds wakeup support for the Main UART in the device tree of
> the TI AM62 family of devices. It defines the specific pins and pinctrl
> states needed to wakeup the system from the Main UART via I/O
> daisy-chaining. The wakeup-source property is configured to describe the
> low power modes the system can wakeup from using the Main UART.
>
> Implementation
> --------------
> This series is intended to be implemented along with the following
> series:
>
> 1. [MERGED] "pmdomain: ti_sci: handle wakeup constraint for out-of-band
> wakeup" [1]: Skips setting constraints for wakeup sources that have
> out-of-band wakeup capability.
>
> 2. "serial: 8250: omap: set out-of-band wakeup if wakeup pinctrl exists"
> [2]: Implements out-of-band wakeup from the UARTs for TI K3 SoCs.
>
> 3. "arm64: dts: ti: k3-am62: Support Main UART wakeup": (this series)
> implements the functionality to wakeup the system from the Main UART.
>
> Testing
> -------
> Tested on a AM62P SK EVM board and a AM62L EVM board with all the above
> mentioned series implemented. Suspend/resume verified with the Main UART
> wakeup source by entering a keypress on the console.
>
> This github branch has all the necessary patches to test the series
> using v6.19-rc1:
> https://github.com/kwillis01/linux/tree/v6.19/uart-daisy-chain/all
>
> [1] https://lore.kernel.org/all/20251230-pmdomain-v1-1-3a009d1ff72e@ti.com/
> [2] https://lore.kernel.org/all/20251230-uart-wakeup-v1-1-13f1bb905f14@ti.com/
>
> ---
> Changes in v3:
> - Reword commits to include the logic of how the "default" and "wakeup"
> pinctrl states are used.
> - Revert pin logic so that main_uart0_pins_default and uart0_pins_default
> are untouched.
> - Remove main_uart0_rx_pins_default and uart0_rx_pins_default.
> - Combine main_uart0 RX wakeup pin and main_uart0 TX pin into one group of
> pins called main_uart0_pins_wakeup or uart0_pins_wakeup.
> - Revert pinctrl-0 to only include main_uart0_pins_wakeup or
> uart0_pins_wakeup.
> - Change pinctrl-1 to only include main_uart0_pins_wakeup or
> uart0_pins_wakeup.
> - Link to v2: https://lore.kernel.org/r/20251230-b4-uart-daisy-chain-dts-v2-0-fa5257ec54bb@ti.com
>
> Changes in v2:
> - Define AM62L system idle states
> - Enable Main UART wakeup for AM62L SoC
> - Rebase to v6.19-rc3
> - Link to v1: https://lore.kernel.org/all/20250904212827.3730314-1-k-willis@ti.com/
>
> ---
> Kendall Willis (5):
> arm64: dts: ti: k3-am62l: Define possible system states
> arm64: dts: ti: k3-am62x-sk-common: Enable Main UART wakeup
> arm64: dts: ti: k3-am62a7-sk: Enable Main UART wakeup
> arm64: dts: ti: k3-am62p5-sk: Enable Main UART wakeup
> arm64: dts: ti: k3-am62l3-evm: Enable Main UART wakeup
>
> arch/arm64/boot/dts/ti/k3-am62a7-sk.dts | 13 ++++++++++++-
> arch/arm64/boot/dts/ti/k3-am62l.dtsi | 12 ++++++++++++
> arch/arm64/boot/dts/ti/k3-am62l3-evm.dts | 11 ++++++++++-
> arch/arm64/boot/dts/ti/k3-am62p5-sk.dts | 13 ++++++++++++-
> arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 13 ++++++++++++-
> 5 files changed, 58 insertions(+), 4 deletions(-)
> ---
> base-commit: 6cd6c12031130a349a098dbeb19d8c3070d2dfbe
> change-id: 20251230-b4-uart-daisy-chain-dts-d01aa40560b2
>
> Best regards,
This series depends on the patch "serial: 8250: omap: set out-of-band
wakeup if wakeup pinctrl exists" [1].
[1]
https://lore.kernel.org/all/20251230-uart-wakeup-v1-1-13f1bb905f14@ti.com/
Best,
Kendall Willis