Re: [PATCH v2 0/2] Add support for bcm2711 in vchiq_arm

From: Adrien Thierry <athierry@redhat.com>
To: Stefan Wahren <stefan.wahren@i2se.com>
Cc: linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	Nicolas Saenz Julienne <nsaenz@kernel.org>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	bcm-kernel-feedback-list@broadcom.com,
	devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Gaston Gonzalez <gascoar@gmail.com>,
	Ojaswin Mujoo <ojaswin98@gmail.com>,
	linux-staging@lists.linux.dev,
	Krzysztof Kozlowski <krzk@kernel.org>
Subject: Re: [PATCH v2 0/2] Add support for bcm2711 in vchiq_arm
Date: Thu, 7 Apr 2022 10:03:55 -0400	[thread overview]
Message-ID: <Yk7vSzk2XD+55EK4@fedora> (raw)
In-Reply-To: <d20fd8f2-c47a-2f3e-4efa-be705f1517b9@i2se.com>

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