Re: [PATCH v2 1/2] arm64: dts: broadcom: clear the warnings caused by empty dma-ranges

[Arnd Bergmann]

On Tue, Dec 15, 2020 at 4:41 PM Florian Fainelli <f.fainelli@xxxxxxxxx> wrote:
>
> On 12/15/2020 5:19 AM, Bharat Gooty wrote:
> > Since the IOMMU is disabled and DMA engine is on 32-bit bus, We can not
> > give the complete DDR for the USB DMA.
> > So restricting the usable DAM size to 4GB.
>
> Thanks, can you make this a proper patch submission along with a Fixes:
> tag that is:
>
> Fixes: 2013a4b684b6 ("arm64: dts: broadcom: clear the warnings caused by
> empty dma-ranges")

Yes, that would be helpful, though I would appreciate a better description
that explains what is actually going on: is it the device or the bus that
has the 32-bit limitation, and if it is indeed a bug in the device, why do
you pretend that this is a 64-bit device on a 32-bit bus instead (this
could also use a comment in the dts file)?

       Arnd