linux-kernel - Re: [PATCH] arm64: dts: x1e80100-crd: describe HID supplies

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Message-ID: <Zxu3orjs9hR5KNc_@hovoldconsulting.com>
Date: Fri, 25 Oct 2024 17:22:10 +0200
From: Johan Hovold <johan@...nel.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Stephan Gerhold <stephan.gerhold@...aro.org>,
	Johan Hovold <johan+linaro@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: x1e80100-crd: describe HID supplies

On Fri, Oct 18, 2024 at 08:19:35PM +0300, Abel Vesa wrote:
> On 24-10-15 16:57:18, Stephan Gerhold wrote:
> > On Tue, Oct 15, 2024 at 02:24:27PM +0200, Johan Hovold wrote:

> > > +&pm8550ve_8_gpios {
> > > +	misc_3p3_reg_en: misc-3p3-reg-en-state {
> > > +		pins = "gpio6";
> > > +		function = "normal";
> > > +		bias-disable;
> > 
> > Can we add a "power-source" here? PMIC GPIOs can be either ~3.7V
> > (VPH_PWR) or 1.8V, depending on which power-source is selected. Without
> > that, we rely on the firmware to set the voltage level for the GPIO
> > during boot.
> 
> AFAIU, the power-source here should be 0, which selects VPH_PWR which is
> 3.3V. In that case I think we can avoid explicitly setting it.

The firmware uses 1.8 V here in fact, but it seems like 3.3 V would work
as well.

> > I'm not sure which one would be suitable here. I guess we can just
> > replicate what the firmware configures during boot.

Let's start with that at least.

Johan