[PATCH v7 0/3] PCI: Add support for PCIe WAKE# interrupt

[Krishna Chaitanya Chundru]

PCIe WAKE# interrupt is needed for bringing back PCIe device state from
D3cold to D0.

This is pending from long time, there was two attempts done previously to
add WAKE# support[1], [2]. Those series tried to add support for legacy
interrupts along with WAKE#. Legacy interrupts are already available in
the latest kernel and we can ignore them. For the wake IRQ the series is
trying to use interrupts property define in the device tree.

This series is using gpio property instead of interrupts, from
gpio desc driver will allocate the dedicate IRQ.

WAKE# is added in dts schema and merged based on this patch.
https://lore.kernel.org/all/20250515090517.3506772-1-krishna.chundru@xxxxxxxxxxxxxxxx/

[1]: https://lore.kernel.org/all/b2b91240-95fe-145d-502c-d52225497a34@xxxxxxxxxx/T/
[2]: https://lore.kernel.org/all/20171226023646.17722-1-jeffy.chen@xxxxxxxxxxxxxx/

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@xxxxxxxxxxxxxxxx>
---
Changes in v7:
- Updated the commit text (Mani).
- Couple of nits like using pci_err instead of dev_err,
  use platform_pci_configure_wake(), platform_pci_remove_wake() instead
  of calling directly calling pci_configure_of_wake_gpio() & pci_remove_of_wake_gpio() etc (Mani).
- Add a new fwnode_gpiod_get() API that wraps fwnode_gpiod_get_index(..0..), similar to
  devm_fwnode_gpiod_get() (Mani).
- Link to v6: https://lore.kernel.org/r/20251127-wakeirq_support-v6-0-60f581f94205@xxxxxxxxxxxxxxxx

Changes in v6:
- Change the name to dev_pm_set_dedicated_shared_wake_irq() and make the
  changes pointed by (Rafael). 
- Link to v5: https://lore.kernel.org/r/20251107-wakeirq_support-v5-0-464e17f2c20c@xxxxxxxxxxxxxxxx

Changes in v5:
- Enable WAKE# irq only when there is wake -gpios defined in its device
  tree node (Bjorn).
- For legacy bindings for direct atach check in root port if we haven't
  find the wake in the endpoint node.
- Instead of hooking wake in driver bound case, do it in the framework
  irrespective of the driver state (Bjorn).
- Link to v4: https://lore.kernel.org/r/20250801-wake_irq_support-v4-0-6b6639013a1a@xxxxxxxxxxxxxxxx

Changes in v4:
- Move wake from portdrv to core framework to endpoint (Bjorn).
- Added support for multiple WAKE# case (Bjorn). But traverse from
  endpoint upstream port to root port till you get WAKE#. And use
  IRQF_SHARED flag for requesting interrupts.
- Link to v3: https://lore.kernel.org/r/20250605-wake_irq_support-v3-0-7ba56dc909a5@xxxxxxxxxxxxxxxx

Changes in v3:
- Update the commit messages, function names etc as suggested by Mani.
- return wake_irq if returns error (Neil).
- Link to v2: https://lore.kernel.org/r/20250419-wake_irq_support-v2-0-06baed9a87a1@xxxxxxxxxxxxxxxx

Changes in v2:
- Move the wake irq teardown after pcie_port_device_remove
  and move of_pci_setup_wake_irq before pcie_link_rcec (Lukas)
- teardown wake irq in shutdown also.
- Link to v1: https://lore.kernel.org/r/20250401-wake_irq_support-v1-0-d2e22f4a0efd@xxxxxxxxxxxxxxxx

---
Krishna Chaitanya Chundru (3):
      PM: sleep: wakeirq: Add support for dedicated shared wake IRQ setup
      gpio: Add fwnode_gpiod_get() helper
      PCI: Add support for PCIe WAKE# interrupt

 drivers/base/power/wakeirq.c  | 39 ++++++++++++++++++++++++++----
 drivers/pci/of.c              | 55 +++++++++++++++++++++++++++++++++++++++++++
 drivers/pci/pci.c             |  9 +++++++
 drivers/pci/pci.h             |  8 +++++++
 drivers/pci/probe.c           |  2 ++
 drivers/pci/remove.c          |  1 +
 include/linux/gpio/consumer.h |  9 +++++++
 include/linux/pci.h           |  2 ++
 include/linux/pm_wakeirq.h    |  6 +++++
 9 files changed, 126 insertions(+), 5 deletions(-)
---
base-commit: cee73b1e840c154f64ace682cb477c1ae2e29cc4
change-id: 20251104-wakeirq_support-f54c4baa18c5

Best regards,
-- 
Krishna Chaitanya Chundru <krishna.chundru@xxxxxxxxxxxxxxxx>