linux-kernel - Re: [PATCH 1/1] dt-bindings: PCI: host-generic-pci: Increase maxItems to 8 of ranges

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Message-ID: <CAL_JsqJAKXfdSVGrOvZFn7_asmgv_g6a7-A7wq87xXKpJJnC8Q@mail.gmail.com>
Date: Wed, 3 Jul 2024 11:26:14 -0600
From: Rob Herring <robh@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: Will Deacon <will@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczyński <kw@...ux.com>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	"open list:PCI DRIVER FOR GENERIC OF HOSTS" <linux-pci@...r.kernel.org>, 
	"moderated list:PCI DRIVER FOR GENERIC OF HOSTS" <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>, 
	imx@...ts.linux.dev
Subject: Re: [PATCH 1/1] dt-bindings: PCI: host-generic-pci: Increase maxItems
 to 8 of ranges

On Tue, Jul 2, 2024 at 9:37 AM Frank Li <Frank.Li@....com> wrote:
>
> IEEE Std 1275-1994 is Inactive-Withdrawn Standard according to
> https://standards.ieee.org/ieee/1275/1932/.

That has nothing to do with this.

> "require at least one non-prefetchable memory and One or both of
> prefetchable Memory and IO Space may also be provided". But it does not
> limit maximum ranges number is 3.

3 was just my poor assumption that a non-prefetch, prefetchable and IO
region would be enough. Not sure why you'd want multiple fragmented
regions though. I guess for device assignment based on the comments.

> Inscrease maximum to 8 because freescale ls1028 and iMX95 use more than
> 3 ranges.

Unless there is some actual limit, I would just drop the minItems and
maxItems here. Then it will be limited to 32 entries in
pci-bus-common.yaml (in dtschema) which is also a 'should be enough'
value.

Rob