[PATCH 0/6] firmware: ti_sci: Partial-IO support

Markus Schneider-Pargmann
2024-05-23T08:02:54Z

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@ti.com/

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(-)