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

Hi Tim,

On Sun, Aug 16, 2026 at 7:20 AM Tim Ouyang <[email protected]> wrote:
>
> On Mon, Aug 03, 2026 at 03:06:12PM -0500, Anirudh Srinivasan 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.
>
> Would you consider adding support for SPL?

I don't have an easy way to test this. This will have to be done later.

>
> > +#define RISCV_IOMMU_DDTP_TIMEOUT          10000000
>
> Although the timeout aligns with Linux’s, it may still be too lengthy
> for the bootloader stage.

What value do you suggest? Seems like none of the other iommu drivers
use timeouts, so I'm not sure what to pick.

> --
> Best regards,
> Tim Ouyang