From: Ulf Hansson <ulf.hansson@linaro.org>
To: Alexander Stein <alexander.stein@ew.tq-group.com>
Cc: Matthias Kaehlcke <mka@chromium.org>,
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
Andy Gross <agross@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Marcel Holtmann <marcel@holtmann.org>,
Johan Hedberg <johan.hedberg@gmail.com>,
Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
Kalle Valo <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Stanimir Varbanov <svarbanov@mm-sol.com>,
linux-arm-msm@vger.kernel.org, linux-mmc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org,
ath10k@lists.infradead.org, linux-wireless@vger.kernel.org,
netdev@vger.kernel.org
Subject: Re: [PATCH v1 00/15] create power sequencing subsystem
Date: Wed, 1 Mar 2023 10:02:48 +0100 [thread overview]
Message-ID: <CAPDyKFq7NFx_cwTZajqjOnRsjJ1i-F0ip+b0ZjFUcOdLjMJSkQ@mail.gmail.com> (raw)
In-Reply-To: <10237323.nUPlyArG6x@steina-w>
On Wed, 1 Mar 2023 at 09:17, Alexander Stein
<alexander.stein@ew.tq-group.com> wrote:
>
> Hi,
>
> sorry for being late to the party.
>
> Am Mittwoch, 19. Oktober 2022, 08:03:22 CET schrieb Dmitry Baryshkov:
> > Ho,
> >
> > On Thu, 13 Oct 2022 at 22:50, Matthias Kaehlcke <mka@chromium.org> wrote:
> > > Do you still plan to refresh this series?
> > >
> > > I know there have been multiple attempts to get something similar
> > > landed in the past 10 year or so. Your series didn't seem to get
> > > much pushback from maintainers, might be worth sending a refresh :)
> >
> > Yes, I hope to return to it eventually. I just had no time for it lately.
>
> I just found this thread while searching for power sequencing devices in
> Linux. From what I understand this is transforming the existing mmc pwrseq
> drivers into generic ones. What is the intention of this new subsystem? What
> is it supposed to address?
> In my case I have an LTE module attached via USB, but in order to use it I
> need to perform several steps:
> 1. apply power supply
> 2. Issue a reset pulse(!), the length actually defines whether its a reset or
> poweroff/on
> 3a. wait for a GPIO to toggle
> 3b. wait a minimum time
> 4a. device will enumerate on USB
> 4b. device can be access using UART
>
> This is something required to actually see/detect the device in the first
> place, thus it cannot be part of the device driver side.
> Is this something pwrseq is supposed to address?
Yes, this is one of those typical use-cases for discoverable buses
that we need to add support for, in one way or the other.
>
> Best regards,
> Alexander
[...]
Kind regards
Uffe
prev parent reply other threads:[~2023-03-01 9:03 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2h9GS3myO9uyX8sDYwU_43cDbBCW_SE1h5qolKQLKT9ZVvz0-K6z6cix50eVsgMsYLtgTLsW37DxF0lf78vxCA==@protonmail.internalid>
2021-10-06 3:53 ` [PATCH v1 00/15] create power sequencing subsystem Dmitry Baryshkov
2021-10-06 3:53 ` [PATCH v1 01/15] dt-bindings: add pwrseq device tree bindings Dmitry Baryshkov
2021-10-26 12:53 ` Rob Herring
2021-10-26 14:42 ` Dmitry Baryshkov
2021-10-27 21:53 ` Rob Herring
2021-11-02 15:26 ` Dmitry Baryshkov
2023-03-10 7:56 ` Srinivas Kandagatla
2021-10-06 3:53 ` [PATCH v1 02/15] power: add power sequencer subsystem Dmitry Baryshkov
2021-10-06 3:53 ` [PATCH v1 03/15] pwrseq: port MMC's pwrseq drivers to new pwrseq subsystem Dmitry Baryshkov
2021-10-06 3:53 ` [PATCH v1 04/15] mmc: core: switch " Dmitry Baryshkov
2021-10-06 3:53 ` [PATCH v1 05/15] pwrseq: implement onecell helper Dmitry Baryshkov
2021-10-06 3:53 ` [PATCH v1 06/15] pwrseq: add support for QCA BT+WiFi power sequencer Dmitry Baryshkov
2021-10-06 3:53 ` [PATCH v1 07/15] pwrseq: add fallback support Dmitry Baryshkov
2021-10-06 3:54 ` [PATCH v1 08/15] pwrseq: pwrseq_qca: implement " Dmitry Baryshkov
2021-10-06 3:54 ` [PATCH v1 09/15] Bluetooth: hci_qca: switch to using pwrseq Dmitry Baryshkov
2021-10-06 3:54 ` [PATCH v1 10/15] ath10k: add support for pwrseq sequencing Dmitry Baryshkov
2021-10-07 5:31 ` Kalle Valo
2021-10-06 3:54 ` [PATCH v1 11/15] arm64: dts: qcom: sdm845-db845c: switch bt+wifi to qca power sequencer Dmitry Baryshkov
2021-10-06 3:54 ` [PATCH v1 12/15] arm64: dts: qcom: qrb5165-rb5: add bluetooth support Dmitry Baryshkov
2021-10-06 3:54 ` [PATCH v1 13/15] arm64: dts: qcom: sdm845-db845c: add second channel to qca power sequencer Dmitry Baryshkov
2021-10-06 3:54 ` [PATCH v1 14/15] WIP: PCI: qcom: use pwrseq to power up bus devices Dmitry Baryshkov
2021-10-06 3:54 ` [PATCH v1 15/15] WIP: arm64: dts: qcom: qrb5165-rb5: add bus-pwrseq property to pcie0 Dmitry Baryshkov
2021-10-07 5:27 ` [PATCH v1 00/15] create power sequencing subsystem Kalle Valo
2021-11-02 14:05 ` Caleb Connolly
2022-09-23 14:39 ` Luca Weiss
2022-10-13 19:50 ` Matthias Kaehlcke
2022-10-19 6:03 ` Dmitry Baryshkov
2023-03-01 8:17 ` Alexander Stein
2023-03-01 9:02 ` Ulf Hansson [this message]
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