Il 26/09/25 12:10, Zhangchao Zhang ha scritto:

Support the platform Bluetooth to be reset by hardware pin,
when a Bluetooth exception occurs, attempt to reset the
Bluetooth module using the hardware reset pin, as this
method is generally more stable and reliable than a
software reset. If the hardware reset pin is not specified
in the device tree, fall back to the existing software
reset mechanism to ensure backward compatibility.

Co-developed: Sean Wang [off-list ref]
Co-developed: Hao Qin [off-list ref]
Co-developed: Chris Lu [off-list ref]
Signed-off-by: Zhangchao Zhang <redacted>

The changelog should come after the "---" otherwise this will get included
into the commit message.

My only complaint is about the changelog, really, so after moving it, you
can add my

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

V8-->V9 modifications:
-Corrected the if judgment in the patch from data->rest_gpio
    to data->reset_gpio.

V7-->V8 modifications:
-Currently, the universal reset GPIO can be found by configuring DTS.
    USB bus can get the device node and reset GPIO in the probe phase.
    It is fully compatible with other vendors' methods of getting reset
    GPIO. Therefore, the previous complex methods of adding the compatible
    string in btmtk.c to get GPIO is discarded. Abi files and yaml files
    are no longer needed. When a Bluetooth exception occurs, the existence
    of GPIO will be determined first. This change improves the robustness
    of Bluetooth recovery on platforms that support hardware reset, while
    maintaining support for platforms that do not.

V6-->V7 modifications:
-Change the gpio_direction_output interface to the gpiod_set_value_cansleep
    and gpiod_put interface.
-Remove the schedule_delayed_work asynchronous operation.
-Delete the #gpio-cell attribute in the yaml file, remove the #gpio-cell
    in the required field, and simplify the contents of the descriptions.

V5-->V6 modifications:
-Add specific revisions in the changes from v4 to v5.
-Add hardware pin title and descriptions to dt-binding submission
    information.
-Modify the title descriptions in the dt-binding file.
-Add 7925 what is it.
-Wrap the descriptions of MT7925 chip uses the USB bus appropriately.
-Change the compatible string to mediatek,mt7925-bluetooth in
    the dt-binding file and driver code.
-Drop gpio-controlelr properties in the dt-binding file.
-Modify the descriptions of the reset-gpios
    properties in the dt-binding file.
-Change the node information of reset-gpios in bluetooth
    from high level valid to low level valid.

V4-->V5 modifications:
-Correct the spelling error of word provides mentioned in V1.
-Drop the xhci0 node and status property in the dt-binding file.
-Modify the bt_reset tag node to bluetooth in the dt-binding file.
-Add #gpio-cell descriptions to properties, nodes and requests.
-Make a separate patch for the changes to dt-binding.

V3-->V4 modifications:
-Modify submission information why use hardware pin to reset Bluetooth.
-Write historical commit information into the cover letter.
-Modify dt binding format information and
    the explanation text in the dt-binding file.

V2-->V3 modifications:
-Changed the capitalization of co-developer names,
    using the correct capitalization of abbreviations and full
    name, and corrected obvious spelling errors.
-Add a revision history.
-Remove the "BT Driver" in the prefix.
-Add the bt-binding document, include inforamtion related to reset
    pin and compatibility matching.
-Add a comment before the schedule_delayed_work function call,
    although schedule_delayed_work is asynchronous, there is no risk.
    Even if it is not completed within 200ms, it will only postpone
    the subsequent probe and will not have any impact.
-Add a comment before the btmtk_reset_by_gpio function call,
    if the compatibility filed or pin cannot be found in the dts
    files, it can still reset bluetooth using software reset.

V2 modifications:
-Modify gpio to GPIO, SW to software,
    and fix other obvious spelling errors.
---

(changelog goes here)

Regards,
Angelo