Re: [PATCH V2 3/8] Bluetooth: btnxpuart: Add M.2 Bluetooth device support using pwrseq

[Frank Li]

On Tue, Jun 23, 2026 at 11:07:30AM +0800, Sherry Sun (OSS) wrote:
> From: Sherry Sun <sherry.sun@xxxxxxx>
>
> Power supply to the M.2 Bluetooth device attached to the host using M.2
> connector is controlled using the 'uart' pwrseq device. So add support for
> getting the pwrseq device if the OF graph link is present. Once obtained,
> pwrseq_power_on() is called to power up the M.2 Bluetooth card. The power
> sequencer descriptor is obtained via devm_pwrseq_get(), so the power-off
> and cleanup are handled automatically when the device is unbound.
>
> Signed-off-by: Sherry Sun <sherry.sun@xxxxxxx>
> ---

Reviewed-by: Frank Li <Frank.Li@xxxxxxx>

>  drivers/bluetooth/btnxpuart.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c
> index e7036a48ce48..438ccaa2b56d 100644
> --- a/drivers/bluetooth/btnxpuart.c
> +++ b/drivers/bluetooth/btnxpuart.c
> @@ -9,6 +9,8 @@
>
>  #include <linux/serdev.h>
>  #include <linux/of.h>
> +#include <linux/of_graph.h>
> +#include <linux/pwrseq/consumer.h>
>  #include <linux/skbuff.h>
>  #include <linux/unaligned.h>
>  #include <linux/firmware.h>
> @@ -1866,6 +1868,18 @@ static int nxp_serdev_probe(struct serdev_device *serdev)
>  		return err;
>  	}
>
> +	if (of_graph_is_present(dev_of_node(&serdev->ctrl->dev))) {
> +		struct pwrseq_desc *pwrseq;
> +
> +		pwrseq = devm_pwrseq_get(&serdev->ctrl->dev, "uart");
> +		if (IS_ERR(pwrseq))
> +			return PTR_ERR(pwrseq);
> +
> +		err = pwrseq_power_on(pwrseq);
> +		if (err)
> +			return err;
> +	}
> +
>  	/* Initialize and register HCI device */
>  	hdev = hci_alloc_dev();
>  	if (!hdev) {
> --
> 2.50.1
>
>