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

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Date: Sat, 2 Mar 2024 00:58:57 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Jianhua Lu <lujianhua000@...il.com>,
 Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: 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 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?

> +		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

> +					 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..

Konrad