linux-kernel - Re: [PATCH v2 0/2] Add support for bcm2711 in vchiq

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Date:   Thu, 7 Apr 2022 10:03:55 -0400
From:   Adrien Thierry <athierry@...hat.com>
To:     Stefan Wahren <stefan.wahren@...e.com>
Cc:     linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Gaston Gonzalez <gascoar@...il.com>,
        Ojaswin Mujoo <ojaswin98@...il.com>,
        linux-staging@...ts.linux.dev,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [PATCH v2 0/2] Add support for bcm2711 in vchiq_arm

Hi Stefan,

Thanks for your feedback.

> Could you please explain your approach, especially leaving out 36 bit
> DMA support?

I realize I overlooked this 36 bit DMA support issue, I need to think it
through a little bit more.

> This is a really bad idea and caused a lot of trouble in the past. A lot
> of the issues in the Fedora or Arch Linux forums or mailing lists
> results from this idea. It wastes the time of the kernel developer since
> these DT files has never been reviewed by the devicetree maintainers.

I understand, thanks! I find the downstream dtbs convenient because of the
overlay system that allows you to easily enable certain drivers, but I get
your point.

Best regards,

Adrien