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