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    SubjectRe: [PATCH v1 00/15] create power sequencing subsystem
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    Hi Dmitry,

    On Wed Oct 6, 2021 at 5:53 AM CEST, Dmitry Baryshkov wrote:
    > This is a proposed power sequencer subsystem. This is a
    > generification of the MMC pwrseq code. The subsystem tries to abstract
    > the idea of complex power-up/power-down/reset of the devices.
    >
    > The primary set of devices that promted me to create this patchset is
    > the Qualcomm BT+WiFi family of chips. They reside on serial+platform
    > or serial + SDIO interfaces (older generations) or on serial+PCIe (newer
    > generations). They require a set of external voltage regulators to be
    > powered on and (some of them) have separate WiFi and Bluetooth enable
    > GPIOs.
    >
    > The major drawback for now is the lack of proper PCIe integration
    > At this moment support for PCIe is hacked up to be able to test the
    > PCIe part of qca6390. Proper PCIe support would require automatically
    > powering up the devices before the scan basing on the proper device
    > structure in the device tree. This two last patches are noted as WIP and
    > are included into the patchset for the purpose of testing WiFi on newer
    > chips (like qca6390/qca6391).

    What's the status of this series? With this I have gotten Bluetooth to
    somewhat work on sm7225-fairphone-fp4, which is using WCN3990/WCN3988.

    Is there another solution with a different patch series that could make
    it work also?

    The latest I could find regarding some new Bluetooth thing is the
    following email from June 2022, but nothing seems to have happened since
    then.
    https://lore.kernel.org/linux-arm-msm/SJ0PR02MB7135746D204F13550E9BAE77F8B29@SJ0PR02MB7135.namprd02.prod.outlook.com/

    Regards
    Luca

    >
    > Changes since RFC v2:
    > - Add documentation for the pwrseq code. Document data structures,
    > macros and exported functions.
    > - Export of_pwrseq_xlate_onecell()
    > - Add separate pwrseq_set_drvdata() function to follow the typical API
    > design
    > - Remove pwrseq_get_optional()/devm_pwrseq_get_optional()
    > - Moved code to handle old mmc-pwrseq binding to the MMC patch
    > - Split of_pwrseq_xlate_onecell() support to a separate patch
    >
    > Changes since RFC v1:
    > - Provider pwrseq fallback support
    > - Implement fallback support in pwrseq_qca.
    > - Mmove susclk handling to pwrseq_qca.
    > - Significantly simplify hci_qca.c changes, by dropping all legacy
    > code. Now hci_qca uses only pwrseq calls to power up/down bluetooth
    > parts of the chip.

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