Re: [PATCH v7 7/7] arm64: dts: imx8mm: imx8mp: Add FIO1-Audio DTOs for Data Modul i.MX8M Mini and Plus eDM SBC

On Thu, Jul 30, 2026 at 09:34:43PM +0200, Marek Vasut wrote:
> On 7/30/26 5:17 PM, Frank Li wrote:
>
> Hello Frank,
>
> > > > +++ b/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1-audio.dtsi
> > > [ ... ]
> > > > +	gpio_feature: io-expander@20 {
> > > > +		compatible = "nxp,pca9554";
> > > > +		reg = <0x20>;
> > > > +		#gpio-cells = <2>;
> > > > +		gpio-controller;
> > > > +		#interrupt-cells = <2>;
> > > > +		interrupt-controller;
> > > > +		interrupt-parent = <&gpio5>;
> > > > +		interrupts = <4 IRQ_TYPE_LEVEL_LOW>;
> > >
> > > [Severity: High]
> > > Does this interrupt routing conflict on the i.MX8MP baseboard?
> > >
> > > The shared overlay hardcodes the PCA9554 interrupt to GPIO5_IO04, which is
> > > correct for i.MX8MM. However, on i.MX8MP, this pad (SPDIF_RX) is physically
> > > routed and configured for CAN1_RX.
> > >
> > > Could this cause the GPIO expander interrupts to fail and CAN traffic to
> > > trigger spurious GPIO interrupts when loaded on the i.MX8MP? Would it be
> > > better to override this interrupt in the i.MX8MP overlay?
> >
> > Yes, I check flexcan1 use this pad at i.MX8MP. you need disable flexcan1
> > at i.mx8mp's dtso file.
>
> I'll fix that in V8.
>
> [...]
>
> > > > +++ b/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc-overlay-edm-mod-imx8mm-fio1-audio.dtso
> > > [ ... ]
> > > > +	sai5clk: clock-controller@30050000 {	/* SAI5 */
> > > > +		compatible = "fsl,imx8mm-sai-clock", "fsl,imx8mq-sai-clock";
> > > > +		reg = <0x30050000 0x10000>;
> > >
> > > [Severity: High]
> > > Can this cause a devres memory region conflict during driver probe?
> > >
> > > This overlay adds a new clock-controller node with the exact same unit address
> > > and register range as the existing sai@30050000 audio node.
> > >
> > > Since both drivers will use devm_platform_ioremap_resource() to request the
> > > region exclusively, whichever probes second might receive -EBUSY and fail.
> >
> > at imx8mm.dts, 30050000 is SAI5, here you change to to use clock-controller
> >
> > Suppose address here is wrong.
> This is correct and we already discussed this in V4, the SAI here is not
> used as an audio controller (not using sound/soc/fsl/fsl_sai.c driver), but
> as a clock controller (yes using drivers/clk/clk-fsl-sai.c driver), the
> bindings differ, hence this node.

Thanks, I forget it. Now, may not allow this method. The same hardware
have to use one compatible string.

Frank