linux-kernel - Re: [PATCH v2 10/14] arm64: dts: rp1: Add support for RaspberryPi's RP1 device

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Message-ID: <Zx4_o34Iyqb5mh_l@apocalypse>
Date: Sun, 27 Oct 2024 14:26:59 +0100
From: Andrea della Porta <andrea.porta@...e.com>
To: Herve Codina <herve.codina@...tlin.com>
Cc: Andrea della Porta <andrea.porta@...e.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Saravana Kannan <saravanak@...gle.com>, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-gpio@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>,
	Stefan Wahren <wahrenst@....net>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v2 10/14] arm64: dts: rp1: Add support for RaspberryPi's
 RP1 device

Hi Herve,

On 16:57 Mon 07 Oct     , Herve Codina wrote:
> Hi Andrea,
> 
> On Mon,  7 Oct 2024 14:39:53 +0200
> Andrea della Porta <andrea.porta@...e.com> wrote:
> 
> > RaspberryPi RP1 is a multi function PCI endpoint device that
> > exposes several subperipherals via PCI BAR.
> > Add a dtb overlay that will be compiled into a binary blob
> > and linked in the RP1 driver.
> > This overlay offers just minimal support to represent the
> > RP1 device itself, the sub-peripherals will be added by
> > future patches.
> > 
> > Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> > ---
> 
> ...
> > +/ {
> > +	fragment@0 {
> > +		target-path="";
> > +		__overlay__ {
> > +			compatible = "pci1de4,1";
> 
> The compatible is not needed here. Indeed, it will be added by the PCI core
> when it scans the bus and adds the missing nodes.
>   https://elixir.bootlin.com/linux/v6.12-rc2/source/drivers/pci/of_property.c#L383

Sure, but I've added it so that the dts could be validated.

> 
> > +			#address-cells = <3>;
> > +			#size-cells = <2>;
> > +
> > +			pci_ep_bus: pci-ep-bus@1 {
> > +				compatible = "simple-bus";
> > +				ranges = <0xc0 0x40000000
> > +					  0x01 0x00 0x00000000
> > +					  0x00 0x00400000>;
> > +				dma-ranges = <0x10 0x00000000
> > +					      0x43000000 0x10 0x00000000
> > +					      0x10 0x00000000>;
> > +				#address-cells = <2>;
> > +				#size-cells = <2>;
> > +				interrupt-controller;
> > +				interrupt-parent = <&pci_ep_bus>;
> > +				#interrupt-cells = <2>;
> 
> Not sure this node should be an interrupt controller.
> The interrupt controller is the PCI device itself (i.e.the node
> where the overlay is applied).

Right.

Many thanks,
Andrea

> 
> Best regards,
> Hervé
>