[PATCH v2 0/6] firmware: ti_sci: Partial-IO support

Markus Schneider-Pargmann
2024-07-29T08:01:56Z

Hi,

v2
--
In v2 I fixed the comments on the first version of this series and
rebased to v6.11-rc1. See below for a more detailed list.

I also dropped the omap serial series for Partial-IO as it can't be
tested with Partial-IO at the moment. The code was tested with other low
power modes but they will be upstreamed later on.

Series
------
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 v6.11-rc1.

Partial-IO
----------
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.
A documentation can also be found in section 6.2.4 in the TRM:
https://www.ti.com/lit/pdf/spruiv7

This other series is relevant for the support of Partial-IO:

- can: m_can: Add am62 wakeup support
https://lore.kernel.org/lkml/20240729074135.3850634-1-msp@baylibre.com/
https://gitlab.baylibre.com/msp8/linux/-/tree/topic/mcan-wakeup-source/v6.11?ref_type=heads

Testing
-------
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/v6.11?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

Previous versions:
v1: https://lore.kernel.org/lkml/20240523080225.1288617-1-msp@baylibre.com/

Changes in v2:
- Rebase to v6.11-rc1
- dt-binding:
- Update commit message
- Add more verbose description of the new binding for a better
explanation.
- ti_sci driver:
- Combine ti_sci_do_send() into ti_sci_do_xfer and only wait on a
response if a flag is set.
- On failure to enter Partial-IO, do emergency_restart()
- Add comments
- Fix small things

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 | 13 ++
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 | 160 +++++++++++++++---
drivers/firmware/ti_sci.h | 34 ++++
7 files changed, 203 insertions(+), 19 deletions(-)

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2.45.2