RE: [PATCH] arm64: dts: imx95-15x15-evk: Disable PCIe bus in the default dts

[Sherry Sun]

> Subject: Re: [PATCH] arm64: dts: imx95-15x15-evk: Disable PCIe bus in the
> default dts
> 
> On Tue, Mar 17, 2026 at 11:10:24AM +0800, Sherry Sun wrote:
> > Disable PCIe bus in the default dts to avoid the shared regulatory
> > between SDIO and PCIe buses, the random probe order between the two
> > buses may break the PCIe initialization sequence which cause PCIe
> > devices has probability of failing to detect.
> >
> > Enable the SDIO WiFi in the default imx95-15x15-evk.dts, and add a
> > separate imx95-15x15-evk-pcie.dtso to enable PCIe bus.
> >
> > Signed-off-by: Sherry Sun <sherry.sun@xxxxxxx>
> > ---
> 
> Why SDIO WIFI is default one? Generally, PCIe have better preformance.

Hi Frank,

The out-of-box M.2 WiFi module on imx95-15x15-evk board is SDIO IW612.
imx95-19x19-evk board use PCIe WiFi as the out-of-box M.2 WiFi module.

Best Regards
Sherry
> 
> Frank
> 
> >  arch/arm64/boot/dts/freescale/Makefile            |  5 ++++-
> >  .../boot/dts/freescale/imx95-15x15-evk-pcie.dtso  | 15
> > +++++++++++++++  arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts |
> > 2 +-
> >  3 files changed, 20 insertions(+), 2 deletions(-)  create mode 100644
> > arch/arm64/boot/dts/freescale/imx95-15x15-evk-pcie.dtso
> >
> > diff --git a/arch/arm64/boot/dts/freescale/Makefile
> > b/arch/arm64/boot/dts/freescale/Makefile
> > index c4e790a268ae..505efc9ebd58 100644
> > --- a/arch/arm64/boot/dts/freescale/Makefile
> > +++ b/arch/arm64/boot/dts/freescale/Makefile
> > @@ -471,7 +471,10 @@ dtb-$(CONFIG_ARCH_MXC) += imx95-19x19-evk-
> sof.dtb
> >  dtb-$(CONFIG_ARCH_MXC) += imx95-toradex-smarc-dev.dtb
> >  dtb-$(CONFIG_ARCH_MXC) += imx95-tqma9596sa-mb-smarc-2.dtb
> >
> > -imx95-15x15-evk-pcie0-ep-dtbs = imx95-15x15-evk.dtb imx-pcie0-ep.dtbo
> > +imx95-15x15-evk-pcie-dtbs = imx95-15x15-evk.dtb
> > +imx95-15x15-evk-pcie.dtbo
> > +dtb-$(CONFIG_ARCH_MXC) += imx95-15x15-evk-pcie.dtb
> > +
> > +imx95-15x15-evk-pcie0-ep-dtbs = imx95-15x15-evk-pcie.dtb
> > +imx-pcie0-ep.dtbo
> >  dtb-$(CONFIG_ARCH_MXC) += imx95-15x15-evk-pcie0-ep.dtb
> > imx95-19x19-evk-pcie0-ep-dtbs += imx95-19x19-evk.dtb imx-pcie0-ep.dtbo
> > imx95-19x19-evk-pcie1-ep-dtbs += imx95-19x19-evk.dtb imx-pcie1-ep.dtbo
> > diff --git a/arch/arm64/boot/dts/freescale/imx95-15x15-evk-pcie.dtso
> > b/arch/arm64/boot/dts/freescale/imx95-15x15-evk-pcie.dtso
> > new file mode 100644
> > index 000000000000..42384e6233f3
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/freescale/imx95-15x15-evk-pcie.dtso
> > @@ -0,0 +1,15 @@
> > +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> > +/*
> > + * Copyright 2026 NXP
> > + */
> > +
> > +/dts-v1/;
> > +/plugin/;
> > +
> > +&pcie0 {
> > +	status = "okay";
> > +};
> > +
> > +&usdhc3 {
> > +	status = "disabled";
> > +};
> > diff --git a/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts
> > b/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts
> > index 7eb12e7d5014..afd89ce3cc5b 100644
> > --- a/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts
> > +++ b/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts
> > @@ -557,7 +557,7 @@ &pcie0 {
> >  	vpcie-supply = <&reg_m2_pwr>;
> >  	vpcie3v3aux-supply = <&reg_m2_pwr>;
> >  	supports-clkreq;
> > -	status = "okay";
> > +	status = "disabled";
> >  };
> >
> >  &pcie0_ep {
> > --
> > 2.37.1
> >