Re: [PATCH 2/2] iommu: add Unisoc iommu basic driver

[Robin Murphy]

On 2021-02-02 14:41, Joerg Roedel wrote:
> On Tue, Feb 02, 2021 at 02:34:34PM +0000, Robin Murphy wrote:
> > Nope, I believe if Arm Ltd. had any involvement in this I'd know about it :)
>
> Okay, got confused by thinking of ARM as the CPU architecture, not the
> company :)
> But given the intel/ and amd/ subdirectories refer to company names as
> well, the same is true for arm/.

Right, trying to group IOMMU drivers by supposed CPU architecture is 
already a demonstrable non-starter; does intel-iommu count as x86, or 
IA-64, or do you want two copies? :P

I somehow doubt anyone would license one of Arm's SMMUs to go in a 
RISC-V/MIPS/etc. based SoC, but in principle, they *could*. In fact it's 
precisely cases like this one - where silicon vendors come up with their 
own little scatter-gather unit to go with their own display controller 
etc. - that I imagine are most likely to get reused if the vendor 
decides to experiment with different CPUs to reach new market segments.

Robin.