Re: [PATCH 1/2] arm64: dts: imx8qm-ss-conn: add usbotg3 iommu information

[Frank Li]

On Tue, Jul 21, 2026 at 09:48:16AM +0200, Alexander Stein wrote:
> Hi Frank,
>
> Am Montag, 20. Juli 2026, 23:10:33 CEST schrieb Frank.Li@xxxxxxxxxxx:
> > From: Frank Li <Frank.Li@xxxxxxx>
> >
> > Add usbotg3 iommu information.
> >
> > Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> > ---
> >  arch/arm64/boot/dts/freescale/imx8qm-ss-conn.dtsi | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8qm-ss-conn.dtsi b/arch/arm64/boot/dts/freescale/imx8qm-ss-conn.dtsi
> > index ccf9f510e0f88..1370a571153a5 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8qm-ss-conn.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8qm-ss-conn.dtsi
> > @@ -32,3 +32,7 @@ &usdhc3 {
> >  	compatible = "fsl,imx8qm-usdhc", "fsl,imx8qxp-usdhc", "fsl,imx7d-usdhc";
> >  	iommus = <&smmu 0x11 0x7f80>;
> >  };
> > +
> > +&usbotg3_cdns3 {
> > +	iommus = <&smmu 0x4 0x7f80>;
>
> Where in the RM can you get these values?

0x4 is stream ID, any value between 0-31, uboot will use this value to
config stream ID for bus master by scfw API

0x7f80 means tire some bit to high before pass to smmu by hardware.
I don't think signal defination can be found at public documents.

static int arm_smmu_of_xlate(struct device *dev,
                             const struct of_phandle_args *args)
{
        u32 mask, fwid = 0;

        if (args->args_count > 0)
                fwid |= FIELD_PREP(ARM_SMMU_SMR_ID, args->args[0]);

        if (args->args_count > 1)
                fwid |= FIELD_PREP(ARM_SMMU_SMR_MASK, args->args[1]);
}

Frank

>
> Thanks and best regards,
> Alexander
>
> > +};
> >
> >
>
>
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