Re: [PATCH 2/3] power: sequencing: pcie-m2: Match WCN6855 and WCN7851 UART BT variants by subdevice ID

[Bartosz Golaszewski]

On Thu, 9 Jul 2026 09:29:41 +0200, Wei Deng <wei.deng@xxxxxxxxxxxxxxxx> said:
> The WCN6855 and WCN7851 combo chips are available in M.2 card variants
> that differ by their BT interface: some expose BT over UART while others
> expose BT over USB. Both variants use the same PCIe device ID for the
> WiFi interface, distinguished only by their sub-system device ID.
>
> The bare PCI_DEVICE() entries match all sub-system IDs, so both UART and
> USB variants hit the same table entry and trigger UART serdev creation.
> For USB variants this is wrong — there is no UART BT interface on such
> a card, and the serdev probe will fail.
>
> Narrow the matches to UART variants only by using PCI_DEVICE_SUB with
> their respective sub-system IDs. USB variants no longer match the table
> and will be handled separately to deassert W_DISABLE2# for USB BT
> enumeration.
>
> Signed-off-by: Wei Deng <wei.deng@xxxxxxxxxxxxxxxx>
> ---
>  drivers/power/sequencing/pwrseq-pcie-m2.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/power/sequencing/pwrseq-pcie-m2.c b/drivers/power/sequencing/pwrseq-pcie-m2.c
> index 83fe6a1396bc..cf51122d54fd 100644
> --- a/drivers/power/sequencing/pwrseq-pcie-m2.c
> +++ b/drivers/power/sequencing/pwrseq-pcie-m2.c
> @@ -191,9 +191,11 @@ static const struct pci_device_id pwrseq_m2_pci_ids[] = {
>  	  .driver_data = (kernel_ulong_t)"nxp,88w8987-bt" },
>  	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x1103, PCI_VENDOR_ID_QCOM, 0x0108),
>  	  .driver_data = (kernel_ulong_t)"qcom,qca2066-bt" },
> -	{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x1103),
> +	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x1103, PCI_VENDOR_ID_FOXCONN, 0xe105),
>  	  .driver_data = (kernel_ulong_t)"qcom,wcn6855-bt" },
> -	{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x1107),
> +	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x1103, PCI_VENDOR_ID_QCOM, 0x337e),
> +	  .driver_data = (kernel_ulong_t)"qcom,wcn6855-bt" },
> +	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x1107, PCI_VENDOR_ID_QCOM, 0x337c),
>  	  .driver_data = (kernel_ulong_t)"qcom,wcn7850-bt" },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x1112),
>  	  .driver_data = (kernel_ulong_t)"qcom,qcc2072-bt" },
>
> --
> 2.34.1
>
>

Do you want me to queue this independently from patch 3/3?

Bart