Re: [PATCH v2] iommu: Add RISC-V IOMMU driver

[Yao Zi <me@ziyao.cc>]

On Tue, Oct 20, 2026 at 05:53:18PM -0500, Anirudh Srinivasan wrote:
> Hi Yao Zi,
> 
> On Tue, Sep 22, 2026 at 1:37 PM Anirudh Srinivasan
> <asrinivasan@oss.tenstorrent.com> wrote:
> >
> > Hi,
> >
> > On Tue, Aug 25, 2026 at 11:43 AM Anirudh Srinivasan
> > <asrinivasan@oss.tenstorrent.com> wrote:
> > >
> > > Adds a basic driver for IOMMUs that conform to the RISC-V IOMMU
> > > specification. This driver sets up the IOMMU in bare mode so that
> > > peripherals requiring DMA in U-Boot can function.
> > >
> > > Signed-off-by: Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com>
> > > ---
> > > Changes in v2:
> > > - Changed DDTP read timeout to 3s from 10s
> > > - Link to v1: https://patch.msgid.link/20260803-riscv_iommu-v1-1-793cfa421ab2@oss.tenstorrent.com
> > > ---
> > > Hi,
> > >
> > > This is a pre-requisite for U-Boot on Tenstorrent Atlantis. On this
> > > platform, the IOMMU comes up in Off mode at boot, so this is needed for
> > > SD and NVME boot to work in U-Boot.
> > > ---
> > >  MAINTAINERS                 |  1 +
> > >  drivers/iommu/Kconfig       |  8 +++++
> > >  drivers/iommu/Makefile      |  1 +
> > >  drivers/iommu/riscv_iommu.c | 82 +++++++++++++++++++++++++++++++++++++++++++++
> > >  4 files changed, 92 insertions(+)
> >
> > Gentle ping on this.
> 
> Gentle ping on this series.

I'll try to have a look soon, but am a little busy these days with
travelling and work. Please ping me again if I don't reply after next
Friday, thanks.

Best regards,
Yao Zi