[PATCH v2 0/7] can: m_can: Add am62 wakeup support

[Markus Schneider-Pargmann <msp@baylibre.com>]

Hi,

v2
--
In v2 I mostly fixed error handling in this series and rebased to
v6.11-rc1.

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
------
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 v6.11-rc1 with this series applied:
  https://lore.kernel.org/lkml/20240726195944.2414812-1-msp@baylibre.com/
Also available at
  https://gitlab.baylibre.com/msp8/linux/-/tree/topic/mcan-fixes/v6.11?ref_type=heads

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/v6.11?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/20240523075347.1282395-1-msp@baylibre.com/

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().

Markus Schneider-Pargmann (6):
  dt-bindings: can: m_can: Add wakeup properties
  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
  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

 .../bindings/net/can/bosch,m_can.yaml         |  20 ++++
 arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi       |   2 +
 arch/arm64/boot/dts/ti/k3-am62a-mcu.dtsi      |   2 +
 .../dts/ti/k3-am62p-j722s-common-mcu.dtsi     |   2 +
 drivers/net/can/m_can/m_can.c                 | 100 +++++++++++++++++-
 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, 133 insertions(+), 9 deletions(-)

-- 
2.45.2