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Date: Wed, 3 Feb 2021 09:49:43 +0800 From: Chunyan Zhang <zhang.lyra@...il.com> To: Robin Murphy <robin.murphy@....com> Cc: Joerg Roedel <joro@...tes.org>, DTML <devicetree@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Chunyan Zhang <chunyan.zhang@...soc.com>, Sheng Xu <sheng.xu@...soc.com>, Linux IOMMU <iommu@...ts.linux-foundation.org>, Rob Herring <robh+dt@...nel.org>, Baolin Wang <baolin.wang7@...il.com>, Orson Zhai <orsonzhai@...il.com> Subject: Re: [PATCH 2/2] iommu: add Unisoc iommu basic driver On Wed, 3 Feb 2021 at 02:02, Robin Murphy <robin.murphy@....com> wrote: > > 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. Yes, I agree, I believe this iommu unit along with Unisoc's multi-media modules can be used on other architecture SoCs, not only ARM based. > > Robin.
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