Re: [RFC PATCH 2/2] PCI: apple: Add driver for the Apple M1

From: Alyssa Rosenzweig <alyssa@rosenzweig.io>
To: Sven Peter <sven@svenpeter.dev>
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>,
	"Marc Zyngier" <maz@kernel.org>,
	"Mark Kettenis" <kettenis@openbsd.org>,
	"Hector Martin" <marcan@marcan.st>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 2/2] PCI: apple: Add driver for the Apple M1
Date: Sun, 15 Aug 2021 17:40:09 -0400	[thread overview]
Message-ID: <YRmJucYuL0T93huV@sunset> (raw)
In-Reply-To: <fb037103-66d5-477f-ba2e-03da74da97c0@www.fastmail.com>

> > +/* The hardware exposes 3 ports. Port 0 (WiFi and Bluetooth) is 
> > special, as it
> > + * is power-gated by SMC to facilitate rfkill.
> > + */
> > +enum apple_pcie_port {
> > +	APPLE_PCIE_PORT_RADIO    = 0,
> > +	APPLE_PCIE_PORT_USB      = 1,
> > +	APPLE_PCIE_PORT_ETHERNET = 2,
> > +	APPLE_PCIE_NUM_PORTS
> > +};
> 
> This will also be used for the Thunderbolt ports, where this enum
> won't apply at all. I could also see Apple changing the individual port
> assignments in the future. I'd just remove it here and have this file be
> a generic PCIe driver for Apple SoCs.

Removed in v2.

> As above, I don't think it makes sense to special-case anything for the
> devices on the bus here. These controllers also have hot plug support,
> so the radios don't have to be on by the time it's initialized.
> We could also just turn them on in the bootloader for now.

This should be fixed in v2 with Mark's device tree bindings.