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Message-ID: <20210408163345.GO4516@sirena.org.uk>
Date: Thu, 8 Apr 2021 17:33:45 +0100
From: Mark Brown <broonie@...nel.org>
To: Rob Herring <robh@...nel.org>
Cc: Jim Quinlan <jim2101024@...il.com>,
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 v4 2/6] dt-bindings: PCI: Add bindings for Brcmstb
endpoint device voltage regulators
On Thu, Apr 08, 2021 at 11:20:16AM -0500, Rob Herring wrote:
> On Tue, Apr 06, 2021 at 02:25:49PM -0400, Jim Quinlan wrote:
> > On Tue, Apr 6, 2021 at 1:32 PM Mark Brown <broonie@...nel.org> wrote:
> > > > On Tue, Apr 6, 2021 at 12:47 PM Mark Brown <broonie@...nel.org> wrote:
> > > > > No great problem with having these in the controller node (assming it
> > > > > accurately describes the hardware) but I do think we ought to also be
> > > > > able to describe these per slot.
> PCIe is effectively point to point, so there's only 1 slot unless
> there's a PCIe switch in the middle. If that's the case, then it's all
> more complicated.
So even for PCIe that case exists, and it's not entirely clear to me
that this is all definitively PCIe specific.
> > o After some deliberation, RobH preferred that the voltage regulators
> > should go into the PCIe subnode device's DT node.
> IIRC, that's because you said there isn't a standard slot.
I recall some message in the thread that said both cases exist even with
this specific system.
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