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

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Message-ID: <CAMEGJJ3=W8_R0xBvm8r+Q7iExZx8xPBHEWWGAT9ngpGWDSKCaQ@mail.gmail.com>
Date: Thu, 13 Feb 2025 15:18:45 +0000
From: Phil Elwell <phil@...pberrypi.com>
To: Andrea della Porta <andrea.porta@...e.com>
Cc: andrew@...n.ch, 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>, herve.codina@...tlin.com, 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

Hi Andrea,

The problem with this approach (loading an overlay from the RP1 PCIe
driver), and it's one that I have raised with you offline, is that
(unless anyone can prove otherwise) it becomes impossible to create a
Pi 5 DTS file which makes use of the RP1's resources. How do you
declare something as simple as a button wired to an RP1 GPIO, or fan
connected to a PWM output?

If this is the preferred route to upstream adoption, I would prefer it
if rp1.dtso could be split in two - an rp1.dtsi similar to what we
have downstream, and an rp1.dtso that #includes it. In this way we can
keep the patching and duplication to a minimum.

Thanks,

Phil

P.S. Apologies for the lack of context - your emails don't make it
through to rpi-kernel-list, and gmail doesn't make it easy to interact
with a mailing list.