linux-kernel - Re: [PATCH 12/13] arm64: dts: sda660-ifc6560: document missing USB PHY supplies

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Date: Thu, 2 May 2024 01:09:41 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Abel Vesa <abel.vesa@...aro.org>,
 Wesley Cheng <quic_wcheng@...cinc.com>, cros-qcom-dts-watchers@...omium.org,
 Bjorn Andersson <andersson@...nel.org>, David Wronek
 <davidwronek@...il.com>, Andy Gross <andy.gross@...aro.org>,
 Evan Green <evgreen@...omium.org>, Douglas Anderson <dianders@...omium.org>,
 Iskren Chernev <me@...ren.info>, Luca Weiss <luca.weiss@...rphone.com>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Yassine Oudjana <y.oudjana@...tonmail.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Krzysztof Kozlowski <krzk@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...ainline.org>
Subject: Re: [PATCH 12/13] arm64: dts: sda660-ifc6560: document missing USB
 PHY supplies

On 1.05.2024 6:19 PM, Dmitry Baryshkov wrote:
> On the IFC6560 one of the USB PHY supplies is the L10A power supply.
> However this regulator also supplies VDDA_APC1_CS, VDD_PLL2 and VDD_P11
> consumers. Touching the supply causes the board to be reset. Document
> the supply as a fixed always-on regulator.

how not to design your power rails 101

> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sda660-inforce-ifc6560.dts | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sda660-inforce-ifc6560.dts b/arch/arm64/boot/dts/qcom/sda660-inforce-ifc6560.dts
> index 702ab49bbc59..60412281ab27 100644
> --- a/arch/arm64/boot/dts/qcom/sda660-inforce-ifc6560.dts
> +++ b/arch/arm64/boot/dts/qcom/sda660-inforce-ifc6560.dts
> @@ -96,6 +96,18 @@ v5p0_boost: v5p0-boost-regulator {
>  
>  		vin-supply = <&vph_pwr>;
>  	};
> +
> +	/*
> +	 * this is also used for APC1 CPU power, touching it resets the board
> +	 */

/* This... */

Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad