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

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Message-ID: <ZoWcm9Rtn/ZGVVtx@lizhi-Precision-Tower-5810>
Date: Wed, 3 Jul 2024 14:46:51 -0400
From: Frank Li <Frank.li@....com>
To: Rob Herring <robh@...nel.org>
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 Wed, Jul 03, 2024 at 11:26:14AM -0600, Rob Herring wrote:
> 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 IEEE Std 1275-1994 is Inactive-Withdrawn Standard according to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.

ENETC is embeded PCI device, hardware address space layout is fragment.

Frank

> 
> > 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