linux-kernel - Re: [PATCH 0/6] ARM: dts: pci-mvebu: Fix assigned-addresses for every PCIe Root Port

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Message-ID: <878rjw9cks.fsf@BL-laptop>
Date:   Mon, 28 Nov 2022 00:56:03 +0100
From:   Gregory CLEMENT <gregory.clement@...tlin.com>
To:     Pali Rohár <pali@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Marek Behún <kabel@...nel.org>
Subject: Re: [PATCH 0/6] ARM: dts: pci-mvebu: Fix assigned-addresses for
 every PCIe Root Port

Pali Rohár <pali@...nel.org> writes:

> Per IEEE Std 1275-1994 bindings documentation (to which kernel DT
> bindings refers), DT property assigned-addresses contains BDF address
> of resource. Currently more PCIe Root Port nodes have BDF address in
> assigned-addresses which points to different PCIe Root Port nodes. This
> obviously does not make sense as the address resource specified in
> assigned-addresses of every PCIe Root Port describes address range of
> internal registers which are specific for corresponding Marvell PCIe
> Root Port. Fix this issue and align all BDF addresses in
> assigned-addresses DT property to specify correct BDF address of the
> current PCIe Root Port.
>
> Note that current version of pci-mvebu.c controller driver, which
> registers Marvell PCIe Root Ports, ignores BDF value in DT property
> assigned-addresses. It expects that Root Port's assigned-addresses
> contains address range of that root port. That is why driver currently
> works without any issue and nobody spotted it. But if driver or
> something else would do device tree validation then this issue should be
> spotted and throws error. Also device tree files may be used by other
> projects where drivers may require correct values.
>
> This patch series aligns BDF address of every Marvell PCIe Root Port in
> node name, config space in reg property and mem in assigned-address
> property of internal registers resource.
>
> Pali Rohár (6):
>   ARM: dts: dove: Fix assigned-addresses for every PCIe Root Port
>   ARM: dts: armada-370: Fix assigned-addresses for every PCIe Root Port
>   ARM: dts: armada-xp: Fix assigned-addresses for every PCIe Root Port
>   ARM: dts: armada-375: Fix assigned-addresses for every PCIe Root Port
>   ARM: dts: armada-38x: Fix assigned-addresses for every PCIe Root Port
>   ARM: dts: armada-39x: Fix assigned-addresses for every PCIe Root Port

Series applied on mvebu/dt

Thanks,

Gregory
>
>  arch/arm/boot/dts/armada-370.dtsi        |  2 +-
>  arch/arm/boot/dts/armada-375.dtsi        |  2 +-
>  arch/arm/boot/dts/armada-380.dtsi        |  4 ++--
>  arch/arm/boot/dts/armada-385.dtsi        |  6 +++---
>  arch/arm/boot/dts/armada-39x.dtsi        |  6 +++---
>  arch/arm/boot/dts/armada-xp-mv78230.dtsi |  8 ++++----
>  arch/arm/boot/dts/armada-xp-mv78260.dtsi | 16 ++++++++--------
>  arch/arm/boot/dts/dove.dtsi              |  2 +-
>  8 files changed, 23 insertions(+), 23 deletions(-)
>
> -- 
> 2.20.1
>

-- 
Gregory Clement, Bootlin
Embedded Linux and Kernel engineering
http://bootlin.com