Re: [PATCH] arm64: dts: qcom: sc8280xp: correct usb phy power supply

[Pengyu Luo]

On Sun, May 17, 2026 at 3:19 AM Jens Glathe
<jens.glathe@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> On 10.01.25 10:23, Pengyu Luo wrote:
> > On this platform, according to dsdt tables, usb{0,1} phy consume the
> > following regulators. usb2 phy should be corrected also, usb2 in dsdt
> > is a little complicated, so correct usb{0,1} only for now.
>
> Can confirm that this works on blackrock and x13s. And I went a
> different route when I tried to verify vregs for blackrock and noticed
> that the vdd voltages didn't match the layer of logic schematic in the
> dwc3 block (some TI documentation), so I switched them already for
> blackrock.
>

I think they might take the power sequence into account when they were
introducing the devices, vdda-phy(~0.9v) first and vdda-pll(1.2v)
later in the upstream while vdd(0.912v) first and core(1.2v) later in
the downstream. BTW, the DSDT is unreliable. On my platform, it
describes that several components are consuming several LDOs, but
these components work well with these LDOs manually disabled via rpmh.

Best wishes,
Pengyu

> Tested-by: Jens Glathe <jens.glathe@xxxxxxxxxxxxxxxxxxxxxx>
>
> with best regards
>
> Jens
>