linux-kernel - Re: [PATCH] arm64: dts: qcom: sm8250-xiaomi-elish: add usb pd negotiation support

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Message-ID: <ZeKWc6rCJBLasn-h@HP-Probook>
Date: Sat, 2 Mar 2024 11:05:05 +0800
From: Jianhua Lu <lujianhua000@...il.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.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: qcom: sm8250-xiaomi-elish: add usb pd
 negotiation support

On Sat, Mar 02, 2024 at 12:58:57AM +0100, Konrad Dybcio wrote:
> On 27.02.2024 13:45, Jianhua Lu wrote:
> > Add usb pd negotiation, but charging is controlled by pm8150b pmic,
> > so it can only charge battery with 5W,
> > 
> > Signed-off-by: Jianhua Lu <lujianhua000@...il.com>
> > ---
> >  arch/arm64/boot/dts/qcom/sm8250-xiaomi-elish-common.dtsi | 9 ++++++++-
> >  1 file changed, 8 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sm8250-xiaomi-elish-common.dtsi b/arch/arm64/boot/dts/qcom/sm8250-xiaomi-elish-common.dtsi
> > index 6f54f50a70b0..ed103b90f4e6 100644
> > --- a/arch/arm64/boot/dts/qcom/sm8250-xiaomi-elish-common.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sm8250-xiaomi-elish-common.dtsi
> > @@ -636,7 +636,8 @@ &pm8150b_typec {
> >  	connector {
> >  		compatible = "usb-c-connector";
> >  
> > -		power-role = "source";
> > +		op-sink-microwatt = <10000000>;
> 
> Is 10W really the minimum value for this tablet to function as a sink?
> 
> Is that what the downstream kernel sets?

This value is taken from other device, I will adjust it to minimum
value in Patch v2.
> 
> > +		power-role = "dual";
> >  		data-role = "dual";
> >  		self-powered;
> >  
> > @@ -645,6 +646,12 @@ PDO_FIXED_DUAL_ROLE |
> >  					 PDO_FIXED_USB_COMM |
> >  					 PDO_FIXED_DATA_SWAP)>;
> >  
> > +		sink-pdos = <PDO_FIXED(5000, 3000,
> > +					 PDO_FIXED_DUAL_ROLE |
> 
> Please align the PDO_.. against the open brace

Acked
> 
> > +					 PDO_FIXED_USB_COMM |
> > +					 PDO_FIXED_DATA_SWAP)
> > +					 PDO_VAR(5000, 12000, 5000)>;
> 
> 60W max? This is not unheard of, but I'm just making sure you know..
downstream kernel's pd adapter allowance is 5v or 9v-12v and vendor
charger allowance is 5v-20v...6.2A-3.25A (67W max), so I set it to 60W.
> 
> Konrad
>