Re: [PATCH v4 2/3] ARM: dts: imx7d: add Variscite VAR-SOM-MX7 support

[Stefano Radaelli <stefano.radaelli21@gmail.com>]

On Tue, Aug 25, 2026 at 09:43:05AM -0500, Frank Li wrote:
> >
> > [Severity: Medium]
> > Does this GPIO hog conflict with the native usdhc3 pinctrl configuration
> > for SD3_RESET_B?
> >
> > The sd3-pwr-hog statically claims gpio6 11, which corresponds to
> > MX7D_PAD_SD3_RESET_B. The pinctrl_usdhc3 later claims the exact same pad as
> > SD3_RESET_B in its native mode.
> >
> 
> Is it true?

It's true, I'll fix it.

> 
> > [Severity: High]
> > Does setting the sw1a maximum voltage to 3.3V violate the hardware limits
> > for the i.MX7D core voltage?
> >
> > The sw1a regulator supplies the cpu0 and cpu1 cores. The PFUZE3000 SW1A limit
> > for this design is typically around 1.475V, and the absolute maximum rating
> > for the i.MX7D ARM cores is usually around 1.15V.
> >
> > If a driver scales the core voltage up to 3.3V based on these boundaries,
> > could this result in hardware damage?
> 
> Please double check this one?
> 
I double-checked this.
PFUZE3000 SW1A supports selector values up to 3.3 V;
the 1.475V limit applies to SW1B, not SW1A.
The regulator-max-microvolt value only defines the regulator constraint,
while the actual CPU voltage is selected according to the i.MX7 OPP table.
Therefore, the 3.3 V constraint does not cause the CPU supply to be
driven to 3.3 V.


Best Regards,
Stefano