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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZxKYp1pGTp/FVGUg@linaro.org>
Date: Fri, 18 Oct 2024 20:19:35 +0300
From: Abel Vesa <abel.vesa@...aro.org>
To: Stephan Gerhold <stephan.gerhold@...aro.org>
Cc: 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 24-10-15 16:57:18, Stephan Gerhold wrote:
> On Tue, Oct 15, 2024 at 02:24:27PM +0200, Johan Hovold wrote:
> > Add the missing HID supplies to avoid relying on other consumers to keep
> > them on.
> > 
> > This also avoids the following warnings on boot:
> > 
> > 	i2c_hid_of 0-0010: supply vdd not found, using dummy regulator
> > 	i2c_hid_of 0-0010: supply vddl not found, using dummy regulator
> > 	i2c_hid_of 1-0015: supply vdd not found, using dummy regulator
> > 	i2c_hid_of 1-0015: supply vddl not found, using dummy regulator
> > 	i2c_hid_of 1-003a: supply vdd not found, using dummy regulator
> > 	i2c_hid_of 1-003a: supply vddl not found, using dummy regulator
> > 
> > Note that VREG_MISC_3P3 is also used for things like the fingerprint
> > reader which are not yet fully described so mark the regulator as always
> > on for now.
> > 
> > Fixes: d7e03cce0400 ("arm64: dts: qcom: x1e80100-crd: Enable more support")
> > Cc: Abel Vesa <abel.vesa@...aro.org>
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > ---
> >  arch/arm64/boot/dts/qcom/x1e80100-crd.dts | 34 +++++++++++++++++++++++
> >  1 file changed, 34 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/x1e80100-crd.dts b/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> > index 10b28d870f08..4ab7078f76e0 100644
> > --- a/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> > +++ b/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> > @@ -288,6 +288,23 @@ vreg_edp_3p3: regulator-edp-3p3 {
> >  		regulator-boot-on;
> >  	};
> >  
> > +	vreg_misc_3p3: regulator-misc-3p3 {
> > +		compatible = "regulator-fixed";
> > +
> > +		regulator-name = "VREG_MISC_3P3";
> > +		regulator-min-microvolt = <3300000>;
> > +		regulator-max-microvolt = <3300000>;
> > +
> > +		gpio = <&pm8550ve_8_gpios 6 GPIO_ACTIVE_HIGH>;
> > +		enable-active-high;
> > +
> > +		pinctrl-names = "default";
> > +		pinctrl-0 = <&misc_3p3_reg_en>;
> > +
> > +		regulator-boot-on;
> > +		regulator-always-on;
> > +	};
> > +
> >  	vreg_nvme: regulator-nvme {
> >  		compatible = "regulator-fixed";
> >  
> > @@ -689,6 +706,9 @@ touchpad@15 {
> >  		hid-descr-addr = <0x1>;
> >  		interrupts-extended = <&tlmm 3 IRQ_TYPE_LEVEL_LOW>;
> >  
> > +		vdd-supply = <&vreg_misc_3p3>;
> > +		vddl-supply = <&vreg_l12b_1p2>;
> > +
> >  		pinctrl-0 = <&tpad_default>;
> >  		pinctrl-names = "default";
> >  
> > @@ -702,6 +722,9 @@ keyboard@3a {
> >  		hid-descr-addr = <0x1>;
> >  		interrupts-extended = <&tlmm 67 IRQ_TYPE_LEVEL_LOW>;
> >  
> > +		vdd-supply = <&vreg_misc_3p3>;
> > +		vddl-supply = <&vreg_l12b_1p2>;
> > +
> >  		pinctrl-0 = <&kybd_default>;
> >  		pinctrl-names = "default";
> >  
> > @@ -721,6 +744,9 @@ touchscreen@10 {
> >  		hid-descr-addr = <0x1>;
> >  		interrupts-extended = <&tlmm 51 IRQ_TYPE_LEVEL_LOW>;
> >  
> > +		vdd-supply = <&vreg_misc_3p3>;
> > +		vddl-supply = <&vreg_l15b_1p8>;
> > +
> >  		pinctrl-0 = <&ts0_default>;
> >  		pinctrl-names = "default";
> >  	};
> > @@ -854,6 +880,14 @@ &pcie6a_phy {
> >  	status = "okay";
> >  };
> >  
> > +&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.

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