Re: [RFC PATCH 1/2] dt-bindings: PCI: Add Apple PCI controller

From: Alyssa Rosenzweig <alyssa@rosenzweig.io>
To: Marc Zyngier <maz@kernel.org>
Cc: linux-pci@vger.kernel.org, "Bjorn Helgaas" <bhelgaas@google.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Stan Skowronek" <stan@corellium.com>,
	"Mark Kettenis" <kettenis@openbsd.org>,
	"Sven Peter" <sven@svenpeter.dev>,
	"Hector Martin" <marcan@marcan.st>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 1/2] dt-bindings: PCI: Add Apple PCI controller
Date: Sun, 15 Aug 2021 21:34:36 -0400	[thread overview]
Message-ID: <YRnArENaLb5SgSfQ@sunset> (raw)
In-Reply-To: <87bl5z18vt.wl-maz@kernel.org>

Hi Marc,

> > Document the properties used by the Apple PCI controller. This is a
> > fairly standard PCI controller, although it is not derived from any
> > known non-Apple IP.
> > 
> > Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
> 
> I would rather you post something as an extension to Mark's work, for
> multiple reasons:
> 
> - Mark's patch is still being discussed, and is the current
>   reference (specially given that it is already in use in OpenBSD and
>   u-boot).
>   
> - we cannot have multiple bindings. There can only be one, shared
>   across implementations. Otherwise, you need a different kernel
>   depending on whether you are booting from m1n1 or u-boot.
> 
> - what you have here is vastly inconsistent (you are describing the
>   MSIs twice, using two different methods).

Absolutely agree, the frankenstein bindings here were the main reason v1
was marked RFC. For v2, I've rebased on Mark's patch, which makes a
bunch of driver magic disappear.

Alyssa