linux-kernel - Re: [PATCH v3 2/7] regulator: qca6390: add support for QCA639x powerup sequence

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Date:   Tue, 22 Jun 2021 18:08:22 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-bluetooth@...r.kernel.org
Subject: Re: [PATCH v3 2/7] regulator: qca6390: add support for QCA639x
 powerup sequence

On Tue, Jun 22, 2021 at 07:46:08PM +0300, Dmitry Baryshkov wrote:
> On Tue, 22 Jun 2021 at 17:38, Mark Brown <broonie@...nel.org> wrote:

> > Well, perhaps it should do one of those things then?

> I don't think so. BT part is just a serdev sitting on top of UART,
> WiFi is PCIe device (for qca6390). So using MFD API (which primarily
> targets platform devices) does not seem logical and feasible.

That really does sound like a MFD - AIUI it's a single chip with
multiple interfaces that needs some glue logic to hold it together.  It
doesn't fit well with the current framework that MFD offers but it's
definitely the same sort of one chip in multiple Linux frameworks sort
of thing.  The only other thing I can think might fit is handling it
like a plug in module for a development board (eg, RPi hats) but we've
not been doing so great at getting them supported upstream.

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