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

[Peng Fan]

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

If using smmu, iova will be in range {36bit, 48bit}? How?

Thanks
Peng

> 
> >
> > 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