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

Message

Markus Schneider-Pargmann May 23, 2024, 7:53 a.m. UTC

Hi,

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 v6.9-rc1.

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:

 - firmware: ti_sci: Partial-IO support
 - serial: 8250: omap: 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 (6):
  dt-bindings: can: m_can: Add wakeup-source property
  dt-bindings: can: m_can: Add wakeup pinctrl state
  can: m_can: Map WoL to device_set_wakeup_enable
  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 +
 arch/arm64/boot/dts/ti/k3-am62p-mcu.dtsi      |  2 +
 drivers/net/can/m_can/m_can.c                 | 43 +++++++++++++++++++
 drivers/net/can/m_can/m_can.h                 |  4 ++
 6 files changed, 73 insertions(+)