[PATCH v3 0/9] can: m_can: Add am62 wakeup support

Markus Schneider-Pargmann
2024-10-11T13:17:59Z

Hi,

Series
------
am62, am62a and am62p support Partial-IO, a poweroff SoC state with a
few pin groups being active for wakeup.

To support mcu_mcan0 and mcu_mcan1 wakeup for the mentioned SoCs, the
series introduces a notion of wake-on-lan for m_can. If the user decides
to enable wake-on-lan for a m_can device, the device is set to wakeup
enabled. A 'wakeup' pinctrl state is selected to enable wakeup flags for
the relevant pins. If wake-on-lan is disabled the default pinctrl is
selected.

It is based on v6.12-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:

- firmware: ti_sci: Partial-IO support
https://gitlab.baylibre.com/msp8/linux/-/tree/topic/am62-partialio/v6.12?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/v6.12?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/20240523075347.1282395-1-msp@baylibre.com/
v2: https://lore.kernel.org/lkml/20240729074135.3850634-1-msp@baylibre.com/

Changes in v3:
- Rebase to v6.12-rc1
- Change 'wakeup-source' to only 'true'
- Simplify m_can_set_wol by returning early on error
- Add vio-suuply binding and handling of this optional property.
vio-supply is used to reflect the SoC architecture and which power
line powers the m_can unit. This is important as some units are
powered in special low power modes.

Changes in v2:
- Rebase to v6.11-rc1
- Squash these two patches for the binding into one:
dt-bindings: can: m_can: Add wakeup-source property
dt-bindings: can: m_can: Add wakeup pinctrl state
- Add error handling to multiple patches of the m_can driver
- Add error handling in m_can_class_allocate_dev(). This also required
to add a new patch to return error pointers from
m_can_class_allocate_dev().

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
Markus Schneider-Pargmann (8):
dt-bindings: can: m_can: Add wakeup properties
dt-bindings: can: m_can: Add vio-supply
can: m_can: Map WoL to device_set_wakeup_enable
can: m_can: Return ERR_PTR on error in allocation
can: m_can: Support pinctrl wakeup state
can: m_can: Add use of optional regulator
arm64: dts: ti: k3-am62: Mark mcu_mcan0/1 as wakeup-source
arm64: dts: ti: k3-am62a-mcu: Mark mcu_mcan0/1 as wakeup-source

Vibhore Vardhan (1):
arm64: dts: ti: k3-am62p-mcu: Mark mcu_mcan0/1 as wakeup-source

.../devicetree/bindings/net/can/bosch,m_can.yaml | 22 +++++
arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi | 2 +
arch/arm64/boot/dts/ti/k3-am62a-mcu.dtsi | 2 +
.../boot/dts/ti/k3-am62p-j722s-common-mcu.dtsi | 2 +
drivers/net/can/m_can/m_can.c | 109 ++++++++++++++++++++-
drivers/net/can/m_can/m_can.h | 4 +
drivers/net/can/m_can/m_can_pci.c | 4 +-
drivers/net/can/m_can/m_can_platform.c | 4 +-
drivers/net/can/m_can/tcan4x5x-core.c | 4 +-
9 files changed, 144 insertions(+), 9 deletions(-)
---
base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc
change-id: 20241009-topic-mcan-wakeup-source-v6-12-8c1d69931bd8

Best regards,
--
Markus Schneider-Pargmann <msp@baylibre.com>