linux-kernel - Re: [PATCH v1 00/15] create power sequencing subsystem

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Message-ID: <df3c0fd1-5ec1-5cf7-f94c-1b2db2882333@linaro.org>
Date:   Tue, 2 Nov 2021 14:05:31 +0000
From:   Caleb Connolly <caleb.connolly@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Stanimir Varbanov <svarbanov@...sol.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v1 00/15] create power sequencing subsystem

Hi Dmitry,

On 06/10/2021 04:53, 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).
> 
> 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.
> 
> 
> 
Tested-by: Caleb Connolly <caleb.connolly@...aro.org>
[Tested on the OnePlus 6]

-- 
Kind Regards,
Caleb (they/them)