Re: [PATCH v1 01/11] arm64: dts: freescale: imx8mm-verdin: Add SPI alias

[Francesco Dolcini <francesco@dolcini.it>]

On Fri, Nov 13, 2026 at 10:11:11AM -0600, Frank Li wrote:
> On Fri, Nov 13, 2026 at 08:31:35AM +0100, Francesco Dolcini wrote:
> > Hello Frank,
> >
> > On Thu, Nov 12, 2026 at 09:41:31AM -0600, Frank Li wrote:
> > > On Thu, Nov 12, 2026 at 04:02:23PM +0100, Francesco Dolcini wrote:
> > > > From: Francesco Dolcini <francesco.dolcini@toradex.com>
> > > >
> > > > The Verdin family pinout defines the SoM interfaces and their
> > > > numbering, SPI_1 being the SPI bus available to the carrier board,
> > > > implemented by ecspi2 on Verdin iMX8MM.
> > > >
> > > > imx8mm.dtsi numbers ecspi2 as spi1, so the Linux bus number in sysfs
> > > > and the spidev name do not match the Verdin interface. Add a spi0
> > > > alias in the SoM dtsi and delete the inherited spi1, so ecspi2 is
> > > > bus 0, zero-based with SPI_1 being spi0, and carries a single alias.
> > > > ecspi3, internal to the SoM with the CAN controller and the TPM, keeps
> > > > the spi2 alias inherited from the SoC.
> > > >
> > > > Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
> > > > ---
> > > >  arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi | 2 ++
> > > >  1 file changed, 2 insertions(+)
> > > >
> > > > diff --git a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> > > > index 1ac9d000d415..0369803a4d46 100644
> > > > --- a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> > > > +++ b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> > > > @@ -16,6 +16,8 @@ chosen {
> > > >  	aliases {
> > > >  		rtc0 = &rtc_i2c;
> > > >  		rtc1 = &snvs_rtc;
> > > > +		spi0 = &ecspi2;
> > > > +		/delete-property/ spi1;
> > >
> > > Can you avoid delete property for new platform?
> >
> > Unfortunately this is needed.
> >
> > The included imx8mm.dtsi has
> >
> >   spi1 = &ecspi2;
> 
> Create patch move aliase to each boards' dts from imx8mm.dtsi, which is
> board feature, not soc features.

Please see the linked thread [0][1]. It's not a viable option.

In addition, I can do this for my boards (Toradex), how do I know what I
have to move for boards I do not know? I can't do that. The only way
would be to duplicate the whole aliases on *every* board.

Unfortunately your proposal does not work.

Francesco