linux-kernel - Re: [PATCH 1/2] dt-bindings: PCI: brcm,stb-pcie: Add num-lanes property

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Message-ID: <CA+-6iNwfxDMd5wpYZP3Ti6G6tdqHsJi2mFYTMOO0wH55CC_YQQ@mail.gmail.com>
Date: Tue, 3 Jun 2025 13:24:07 -0400
From: Jim Quinlan <james.quinlan@...adcom.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>
Cc: linux-pci@...r.kernel.org, Nicolas Saenz Julienne <nsaenz@...nel.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, 
	bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com, 
	Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczyński <kw@...ux.com>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	"moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>, 
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" <linux-rpi-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 1/2] dt-bindings: PCI: brcm,stb-pcie: Add num-lanes property

On Tue, Jun 3, 2025 at 1:17 PM Florian Fainelli
<florian.fainelli@...adcom.com> wrote:
>
> On 6/3/25 10:16, Jim Quinlan wrote:
> > On Tue, Jun 3, 2025 at 12:24 PM Florian Fainelli
> > <florian.fainelli@...adcom.com> wrote:
> >>
> >> On 5/30/25 16:32, Florian Fainelli wrote:
> >>> On 5/30/25 15:40, Jim Quinlan wrote:
> >>>> Add optional num-lanes property Broadcom STB PCIe host controllers.
> >>>>
> >>>> Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
> >>>
> >>> Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
> >>
> >> Sorry I take that back, I think this should be:
> >>
> >> num-lanes:
> >>     enum: [ 1, 2, 4 ]
> >>
> >> We are basically documenting the allowed values, not specifying that we
> >> can repeat the num-lames property between 1 and 4 times.
> >
> > num-lanes is already defined as
> >
> >      enum: [ 1, 2, 4, 8, 16, 32 ]
>
> Right, but then we need to re-define it with our own specific
> constraints, still, don't we?
We do; there is the provided enum and we provide the maximum and minimum.
The AND-ing of all constraints yields [1, 2, 4].
Also, I'm not sure one can redefine an existing property or would want to.

> --
> Florian

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