Hi, Partial-IO is a poweroff SoC state with a few pingroups active for wakeup. This state can be entered by sending a TI_SCI PREPARE_SLEEP message. The message is sent on poweroff if one of the potential wakeup sources for this power state are wakeup enabled. A list of potential wakeup sources for the specific SoC is described in the devicetree. The wakeup sources can be individually enabled/disabled by the user in the running system. The series is based on Andrew Davis accepted patches: [PATCH 0/4] Unconditionally register TI-SCI reset handler https://lore.kernel.org/lkml/20240326223730.54639-1-afd@xxxxxx/ This series is part of a bigger topic to support Partial-IO on am62, am62a and am62p. Partial-IO is a poweroff state in which some pins are able to wakeup the SoC. In detail MCU m_can and two serial port pins can trigger the wakeup. These two other series are relevant for the support of Partial-IO: - serial: 8250: omap: Add am62 wakeup support - can: m_can: Add am62 wakeup support A test branch is available here that includes all patches required to test Partial-IO: https://gitlab.baylibre.com/msp8/linux/-/tree/integration/am62-lp-sk-partialio/v6.9?ref_type=heads After enabling Wake-on-LAN the system can be powered off and will enter the Partial-IO state in which it can be woken up by activity on the specific pins: ethtool -s can0 wol p ethtool -s can1 wol p poweroff I tested these patches on am62-lp-sk. Best, Markus Markus Schneider-Pargmann (5): dt-bindings: ti, sci: Add property for partial-io-wakeup-sources firmware: ti_sci: Partial-IO support arm64: dts: ti: k3-pinctrl: Add WKUP_EN flag arm64: dts: ti: k3-am62: Add partial-io wakeup sources arm64: dts: ti: k3-am62a: Add partial-io wakeup sources Vibhore Vardhan (1): arm64: dts: ti: k3-am62p: Add partial-io wakeup sources .../bindings/arm/keystone/ti,sci.yaml | 6 + arch/arm64/boot/dts/ti/k3-am62.dtsi | 4 + arch/arm64/boot/dts/ti/k3-am62a.dtsi | 4 + arch/arm64/boot/dts/ti/k3-am62p.dtsi | 4 + arch/arm64/boot/dts/ti/k3-pinctrl.h | 3 + drivers/firmware/ti_sci.c | 135 +++++++++++++++++- drivers/firmware/ti_sci.h | 31 ++++ 7 files changed, 186 insertions(+), 1 deletion(-) -- 2.43.0
