[PATCH 2/2] dts: Add u-boot specific 'fsl,mux_mask' property to iomuxc for vf610

[Lukasz Majewski]

Hi Tom,

> On Tue, Jun 24, 2025 at 10:47:00PM +0200, Lukasz Majewski wrote:
> 
> > The commit e8a9521e649f
> > ("vf500/vf610: synchronise device trees with linux")
> > has synchronized U-Boot's DTS with v5.19 Linux kernel.
> > It turned out that in Linux's upstream iomuxc node description the
> > fsl,mux_mask' was missing, so the U-Boot's pinctrl driver for NXP's
> > Vybrid SoC was not working properly.
> > 
> > As by default the mux mask was set to 0, the vf610 based boards
> > (like BK4) were bricked, due to misconfiguration of gpio at early
> > boot stage.
> > 
> > The fix for all vf610 based boards is to introduce
> > vfxxx-u-boot.dtsi file with 'fsl,mux_mask' property provided and
> > include it in boards' specific U-Boot adjustment files (like
> > vf610-bk4r1-u-boot.dtsi).
> > 
> > Signed-off-by: Lukasz Majewski <lukma at denx.de>
> > ---
> >  arch/arm/dts/vf610-bk4r1-u-boot.dtsi | 2 ++
> >  arch/arm/dts/vfxxx-u-boot.dtsi       | 9 +++++++++
> >  2 files changed, 11 insertions(+)
> >  create mode 100644 arch/arm/dts/vfxxx-u-boot.dtsi  
> 
> It looks like this is still missing upstream, so what's the status on
> that? 

It looks like in Linux the mux_mask is hardcoded (for Vybrid vf610):
https://elixir.bootlin.com/linux/v6.16-rc3/source/drivers/pinctrl/freescale/pinctrl-vf610.c#L321

In u-boot other SoCs use it as well, but with different values:
- arch/arm/dts/imxrt1050.dtsi -> 0x7
- arch/arm/dts/imx8ulp-evk-u-boot.dtsi -> 0xf00

In the imx8ulp case above - it is already set in *-u-boot.dtsi specific
file, so I've followed this approach.

> Thanks.
> 




Best regards,

Lukasz Majewski

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