Re: [PATCH v2 1/2] dt-bindings: soc: tegra: Document Nvidia Tegra modem pwrseq

[Svyatoslav Ryhel]

вт, 26 трав. 2026 р. о 14:14 Bartosz Golaszewski <brgl@xxxxxxxxxx> пише:
>
> On Tue, 26 May 2026 12:03:59 +0200, Svyatoslav Ryhel <clamor95@xxxxxxxxx> said:
> > вт, 26 трав. 2026 р. о 12:51 Bartosz Golaszewski <brgl@xxxxxxxxxx> пише:
> >>
> >> On Sat, May 23, 2026 at 10:51 AM Svyatoslav Ryhel <clamor95@xxxxxxxxx> wrote:
> >> >
> >> > Document the Tegra modem pwseq used by various devices based on the Nvidia
> >> > Tegra SoC, describing its usage. The power sequence provides interaction
> >> > between the modem and SoC-specific interface configurations.
> >> >
> >> > Signed-off-by: Svyatoslav Ryhel <clamor95@xxxxxxxxx>
> >> > ---
> >>
> >> ...
> >>
> >> > +
> >> > +examples:
> >> > +  - |
> >> > +    #include <dt-bindings/gpio/gpio.h>
> >> > +
> >> > +    pwrseq-modem {
> >> > +        compatible = "nvidia,tegra-modem-pwrseq";
> >> > +
> >> > +        enable-gpios = <&gpio 165 GPIO_ACTIVE_HIGH>;
> >> > +        power-supply = <&vdd_3v3_vbat>;
> >> > +
> >> > +        nvidia,usb-bus = <&usb2>;
> >> > +    };
> >> > --
> >> > 2.51.0
> >> >
> >>
> >> I assume there's no such component as the tegra modem *pwrseq*?
> >
> > Hardware component, I assume no.
> >
> >> What is the relationship between this node and the "infineon,xmm6260"
> >> compatible node?
> >>
> >
> > The xmm6260 has a phandle reference to it. Since there is consumer
> > matching logic in the pwrseq driver I am leaning towards removing this
> > node entirely. This patches is still in non-final stage and I would
> > like to hear any opinions on the way to improving it.
> >
>
> The node attached to the pwrseq provider device should represent a real
> hardware component. Are the enable-gpios and power-supply lines connected
> to the modem package?

Yes, enable-gpio is connected to the modem and signals that USB is set
and ready to work with the modem, while power-supply is an optional
supply connected to the modem's vbus input.

> Is there an internal structure to it, like a PMIC to which these lines connect
> that controls the actual modem IC?

Modem does have internal PMIC to power up all its components, but they
are controlled by the modems internal firmware and are not accessible
via any standard means.

> Bart