linux-kernel - [PATCH] arm64: dts: marvell: armada-37xx: Set linux,pci-domain to zero

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Date:   Mon, 12 Apr 2021 14:39:36 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Marek Behún <marek.behun@....cz>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: [PATCH] arm64: dts: marvell: armada-37xx: Set linux,pci-domain to zero

Since commit 526a76991b7b ("PCI: aardvark: Implement driver 'remove'
function and allow to build it as module") PCIe controller driver for
Armada 37xx can be dynamically loaded and unloaded at runtime. Also driver
allows dynamic binding and unbinding of PCIe controller device.

Kernel PCI subsystem assigns by default dynamically allocated PCI domain
number (starting from zero) for this PCIe controller every time when device
is bound. So PCI domain changes after every unbind / bind operation.

Alternative way for assigning PCI domain number is to use static allocated
numbers defined in Device Tree. This option has requirement that every PCI
controller in system must have defined PCI bus number in Device Tree.

Armada 37xx has only one PCIe controller, so assign for it PCI domain 0 in
Device Tree.

After this change PCI domain on Armada 37xx is always zero, even after
repeated unbind and bind operations.

Signed-off-by: Pali Rohár <pali@...nel.org>
Fixes: 526a76991b7b ("PCI: aardvark: Implement driver 'remove' function and allow to build it as module")
---
 arch/arm64/boot/dts/marvell/armada-37xx.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
index 7a2df148c6a3..f02058ef5364 100644
--- a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
@@ -495,6 +495,7 @@
 					<0 0 0 2 &pcie_intc 1>,
 					<0 0 0 3 &pcie_intc 2>,
 					<0 0 0 4 &pcie_intc 3>;
+			linux,pci-domain = <0>;
 			max-link-speed = <2>;
 			phys = <&comphy1 0>;
 			pcie_intc: interrupt-controller {
-- 
2.20.1