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

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Message-ID: <20241007165740.14d372f5@bootlin.com>
Date: Mon, 7 Oct 2024 16:57:40 +0200
From: Herve Codina <herve.codina@...tlin.com>
To: Andrea della Porta <andrea.porta@...e.com>
Cc: 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 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

> +			#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).

Best regards,
Hervé