[PATCH 0/3] power: sequencing: pcie-m2: Enable USB/UART BT coexistence on Hamoa EVK

[Wei Deng]

M.2 combo chips expose Wi-Fi over PCIe and Bluetooth over either UART
or USB, depending on the card variant. Both variants share the same PCIe
device ID but use different sub-system IDs. The current driver uses bare
PCI_DEVICE() matches that cover all sub-system IDs, so both variants
trigger UART serdev creation — wrong for USB-only BT cards.

This series fixes USB/UART BT coexistence by:

1. Narrowing WCN6855 and WCN7851 table entries to UART-only sub-system
   IDs so USB variants no longer trigger UART serdev creation.

2. Deasserting W_DISABLE2# for any PCIe device detected under the
   connector that does not match a UART BT entry, allowing the BT
   subsystem to power up and the USB BT interface to enumerate.

3. Describing the PCIe M.2 Key E connector on the Hamoa IoT EVK,
   adding w-disable2-gpios for software control of W_DISABLE2#.

Validated on Hamoa IoT EVK (IQ-X7181-EVK) with multiple M.2 cards:
UART BT (WCN6855, WCN7851, QCC2072) and USB BT (WCN6855, WCN7851)
all work correctly.

Signed-off-by: Wei Deng <wei.deng@xxxxxxxxxxxxxxxx>
---
Wei Deng (3):
      arm64: dts: qcom: hamoa-iot-evk: Describe the PCIe M.2 Key E connector
      power: sequencing: pcie-m2: Match WCN6855 and WCN7851 UART BT variants by subdevice ID
      power: sequencing: pcie-m2: Deassert W_DISABLE2# when no UART serdev is created

 arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts | 129 ++++++++++-------------------
 arch/arm64/boot/dts/qcom/hamoa.dtsi        |   1 +
 drivers/power/sequencing/pwrseq-pcie-m2.c  |  39 ++++++---
 3 files changed, 74 insertions(+), 95 deletions(-)
---
base-commit: b9810cd75b9fb56a3425d391cba3f608502bd474
change-id: 20260709-fix-hamoa-m2-w-disable2-0fe775072c74

Best regards,
-- 
Wei Deng <wei.deng@xxxxxxxxxxxxxxxx>