linux-kernel - Re: [PATCH v6 00/10] Add support for RaspberryPi RP1 PCI device using a DT overlay

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Message-ID: <CAMEGJJ0QbzCScfTRA_pw_8A=iMYMAAFs69zFNLwcOxF5Syugpw@mail.gmail.com>
Date: Thu, 13 Feb 2025 17:57:37 +0000
From: Phil Elwell <phil@...pberrypi.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Herve Codina <herve.codina@...tlin.com>, Andrea della Porta <andrea.porta@...e.com>, 
	Arnd Bergmann <arnd@...db.de>, 
	"maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" <bcm-kernel-feedback-list@...adcom.com>, bhelgaas@...gle.com, brgl@...ev.pl, 
	Catalin Marinas <catalin.marinas@....com>, Conor Dooley <conor+dt@...nel.org>, derek.kiernan@....com, 
	devicetree@...r.kernel.org, dragan.cvetic@....com, 
	Florian Fainelli <florian.fainelli@...adcom.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, krzk+dt@...nel.org, kw@...ux.com, 
	Linus Walleij <linus.walleij@...aro.org>, 
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, linux-clk@...r.kernel.org, 
	linux-gpio@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, 
	"open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" <linux-pci@...r.kernel.org>, 
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" <linux-rpi-kernel@...ts.infradead.org>, lpieralisi@...nel.org, 
	luca.ceresoli@...tlin.com, manivannan.sadhasivam@...aro.org, 
	masahiroy@...nel.org, Michael Turquette <mturquette@...libre.com>, 
	Rob Herring <robh@...nel.org>, saravanak@...gle.com, Stephen Boyd <sboyd@...nel.org>, 
	thomas.petazzoni@...tlin.com, Stefan Wahren <wahrenst@....net>, 
	Will Deacon <will@...nel.org>, Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: Re: [PATCH v6 00/10] Add support for RaspberryPi RP1 PCI device using
 a DT overlay

On Thu, 13 Feb 2025 at 17:45, Andrew Lunn <andrew@...n.ch> wrote:
>
> > > Or do you mean a custom board, which has a CPU, RP1 and the button and
> > > fan are directly on this custom board? You then want a board DTS which
> > > includes all these pieces?
> >
> > That depends on whether you count the Raspberry Pi 5 as a custom board.
>
> So you mean the Pi 5 board would itself make use of the resources the
> RP1 device has? They are not simply connected to headers for plugin
> boards, but used by the main board? Hence you want to describe them in
> the board .DTS file.

That's correct. But even for plug-in devices, those which are on
non-discoverable buses need overlays to declare them, which causes a
problem when the overlay application happens before the kernel is
started.

Phil