Re: [PATCH v2 2/2] arm64: dts: rockchip: Add Radxa E54C

[Shawn Lin]

Hi Chukun

在 2026/10/12 星期一 14:40, Chukun Pan 写道:
> Hi,
>
> > I was checking all PCIe part of rockchip dts files and wondered why it's
> > marked as an always-on regulator. But if it's actually not, it'd be
> > better to improve it later. That would make reset rootport mechanism
> > work better.
>
> Please refer to page 21 of the schematic[1]. The 3V3_PCIE regulator
> is enabled by the PMIC and cannot be controlled by the kernel. So I
> think it's correct to mark it as always-on.
>
> [1] https://dl.radxa.com/e/e54c/hw/radxa_e54c_v1.2_schematic.pdf

Thank you for providing the schematic. It does appear to be in an
uncontrolled state. Theoretically, PCIe control timing requires a
controllable power supply. The current design may cause trouble
enumerating certain devices due to always-on power. Unfortunately, this
board already has always-on power, so let's just leave it as is.

> Thanks,
> Chukun