Re: [PATCH 2/4] arm64: dts: imx95: switch usb3 controller to flattened model

[Xu Yang]

On Tue, Apr 21, 2026 at 11:53:12PM -0400, Frank Li wrote:
> On Tue, Apr 21, 2026 at 06:55:01PM +0800, Xu Yang wrote:
> > Switch to use flattened model for USB3 controller. To enable USB
> > controller with restricted DMA access range to work correctly, add a
> > pseudo simple-bus to constrain the dma address.
> 
> i.mx95 should fix >4G dma space's problem. Does it impact other no-nxp
> boards?

Yes, i.MX95 has fixed >3G address DMA access problem.

It's another issue. HSIO domain only support 36 bit bus access. If not use smmu,
no any issue. If use smmu, it will allocate memory space of 36 bit < iova < 48bit.
HSIO can't handle this case.

> 
> Need do break compatible judgement such as
> 
> i.MX95 is new SoC and still is heave development. The break compatible is
> accepable at development early phase.
> 
> You can rephrase it.

OK.

Thanks,
Xu Yang