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

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Message-ID: <YRmJucYuL0T93huV@sunset>
Date:   Sun, 15 Aug 2021 17:40:09 -0400
From:   Alyssa Rosenzweig <alyssa@...enzweig.io>
To:     Sven Peter <sven@...npeter.dev>
Cc:     linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Stan Skowronek <stan@...ellium.com>,
        Marc Zyngier <maz@...nel.org>,
        Mark Kettenis <kettenis@...nbsd.org>,
        Hector Martin <marcan@...can.st>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] PCI: apple: Add driver for the Apple M1

> > +/* 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.