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[0/5] serial: 8250: omap: Add am62 wakeup support

Message ID 20240523075819.1285554-1-msp@baylibre.com
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Series serial: 8250: omap: Add am62 wakeup support | expand

Message

Markus Schneider-Pargmann May 23, 2024, 7:58 a.m. UTC 
Hi,

to support wakeup from Partial-IO using serial pins of mcu_uart0 and
wkup_uart0, this series adds a new pinctrl state 'wakeup' in which
specific wakeup flags are set on these pins. Partial-IO is a poweroff
state of the SoC in which only a few pingroups are partly powered.

If the user enabled wakeup from the serial port, the pinctrl state is
selected on shutdown. For another deep sleep state, which is comparable
with suspend to memory, the same pinctrl state is selected on suspend as
well.

The series 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
 - can: m_can: Add am62 wakeup support

A test branch is available 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: serial: 8250_omap: Add wakeup pinctrl state
  serial: 8250: omap: Remove unused wakeups_enabled
  serial: 8250: omap: Set wakeup capable, do not enable
  serial: 8250: omap: Support wakeup pinctrl state
  serial: 8250: omap: Set wakeup pinctrl on suspend

 .../devicetree/bindings/serial/8250_omap.yaml | 16 ++++++
 drivers/tty/serial/8250/8250_omap.c           | 56 ++++++++++++++++++-
 2 files changed, 70 insertions(+), 2 deletions(-)