linux-kernel - Re: [PATCH v3 1/6] dt-bindings: PCI: Add bindings for Brcmstb EP voltage regulators

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Message-ID: <20210331114650.GA4758@sirena.org.uk>
Date:   Wed, 31 Mar 2021 12:46:50 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jim Quinlan <jim2101024@...il.com>
Cc:     Rob Herring <robh@...nel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/6] dt-bindings: PCI: Add bindings for Brcmstb EP
 voltage regulators

On Tue, Mar 30, 2021 at 12:23:35PM -0400, Jim Quinlan wrote:
> On Tue, Mar 30, 2021 at 11:30 AM Mark Brown <broonie@...nel.org> wrote:

> > For a soldered down part I'd expect we'd want both (if the host even
> > cares) - for anything except a supply that I/O or something else shared
> > is referenced off there's no great reason why it has to be physically
> > the same supply going to every device on the bus so each device should
> > be able to specify separately.

> Our developer and reference boards frequently have Mini and half-mini
> PCIe sockets (a few exceptions), whereas production boards are mostly
> soldered down.

On reflection I think the above probably also applies to sockets - you'd
just have to have a socket visible in the DT.

> If I resubmit this pullreq  so that it  looks for "vpcie12v-supply"
> and "vpcie3v3-supply" in the host node, will that be acceptable for
> both of you?

I think you will need both (assuming the controller actually physically
gets the supplies) - like I say the sockets/devices may not all share
the same 12V and 3.3V rails.

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