linux-kernel - Adding an interrupt to a PCI device via an ACPI entry

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Message-ID: <20b215fd-51bd-4450-a2ff-110e88d11e95@alliedtelesis.co.nz>
Date: Tue, 12 Mar 2024 20:28:21 +0000
From: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To: "x86@...nel.org" <x86@...nel.org>, "linux-acpi@...r.kernel.org"
	<linux-acpi@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Adding an interrupt to a PCI device via an ACPI entry

Hi All,

Is there a way to add information about a PCI device via an ACPI entry? 
I'm trying to deal with a device that has an erratum where regular PCI-e 
MSI interrupts don't work. The workaround is to connect a dedicated INT 
output line to an interrupt input on the board. The hardware design has 
done this but I'm trying to figure out how to make that work with ACPI 
describing the hardware.

I know in devicetree land I can do this with something like

&pcic {
                 mydevice@1,0 {
                         compatible = "pci1234,5678";
                         reg = <0x00000000 0 0 0 0>;
                         interrupt-parent = <&intc>;
                         interrupts = <1 IRQ_TYPE_LEVEL_LOW>;
                 };
};

And then when my driver is bound to device the usual irq resource stuff 
will give me the right interrupt line.

Is there a way of expressing this kind of thing in ACPI?

Thanks,
Chris