[PATCH v5 0/5] arm64: dts: ti: k3-am62: Support Main UART wakeup

[Kendall Willis]

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.

Testing
-------
Tested on a AM62P SK EVM board and a AM62L EVM board. Suspend/resume
verified with the Main UART wakeup source by entering a keypress on the
console.

---
Changes in v5:
- Enable Main UART wakeup for AM62D SoC.
- Link to v4: https://lore.kernel.org/r/20260122-b4-uart-daisy-chain-dts-v4-0-cfdabdf5e6c1@ti.com

Changes in v4:
- Dropped AM62L system idle states patch.
- Removed AM62L system idle states from the wakeup-source property.
- Link to v3: https://lore.kernel.org/r/20260106-b4-uart-daisy-chain-dts-v3-0-398a66258f2c@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-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
      arm64: dts: ti: k3-am62d2-evm: Enable Main UART wakeup

 arch/arm64/boot/dts/ti/k3-am62a7-sk.dts        | 13 ++++++++++++-
 arch/arm64/boot/dts/ti/k3-am62d2-evm.dts       | 13 ++++++++++++-
 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(+), 5 deletions(-)
---
base-commit: c8a4a774a9b0d2c86593492625874e27e9cbc9a9
change-id: 20251230-b4-uart-daisy-chain-dts-d01aa40560b2
prerequisite-change-id: 20251230-uart-wakeup-00faeac7c994:v2
prerequisite-patch-id: f886c56dbb291b710ec07001ce79b0016c233e1c

Best regards,
-- 
Kendall Willis <k-willis at ti.com>