linux-kernel - Re: [PATCH] ARM: dts: bcm2711: Add pcie0 alias

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Message-ID: <51e9f945-b047-eb66-28c0-54d467ce51a7@raspberrypi.com>
Date:   Wed, 26 Feb 2020 17:17:30 +0000
From:   Phil Elwell <phil@...pberrypi.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Rob Herring <robh+dt@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     phil@...pberrypi.org, devicetree@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: bcm2711: Add pcie0 alias

Hi Nicolas,

On 26/02/2020 16:46, Nicolas Saenz Julienne wrote:
> Some bcm2711 revisions have different DMA constraints on the their PCIE
> bus. The lower common denominator, being able to access the lower 3GB of
> memory, is the default setting for now. Newer SoC revisions are able to
> access the whole memory space.
> 
> Raspberry Pi 4's firmware is aware of this limitation and will correct
> the PCIE's dma-ranges property if a pcie0 alias is available. So add
> it.

I can confirm that this is exactly what the firmware is looking for, so

Reviewed-by: Phil Elwell <phil@...pberrypi.com>

Phil