linux-kernel - Re: [PATCH 9/9] arm64: dts: imx8mn-bsh-smm-s2-common: Disable PMIC SNVS reset target state

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Message-ID: <fb5b60e9-eaf9-42bc-9bda-0c80bd55f81d@gmail.com>
Date: Thu, 15 May 2025 12:28:43 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Dario Binacchi <dario.binacchi@...rulasolutions.com>,
 linux-kernel@...r.kernel.org
Cc: Simon Holesch <simon.holesch@...g.com>,
 Karthikdatt Anantharamrao <karthikdatt.anantharamrao@...bosch.com>,
 michael@...rulasolutions.com, linux-amarula@...rulasolutions.com,
 Wolfgang Birkner <wolfgang.birkner@...g.com>,
 Conor Dooley <conor+dt@...nel.org>, Fabio Estevam <festevam@...il.com>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Rob Herring <robh@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
 Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 9/9] arm64: dts: imx8mn-bsh-smm-s2-common: Disable PMIC
 SNVS reset target state

On 14/05/2025 11:25, Dario Binacchi wrote:
> From: Wolfgang Birkner <wolfgang.birkner@...g.com>
> 
> VDD_DRAM was disabled on standby, therefore the reference hardware did not
> wake up reliable. Use PMIC reset target state READY instead of SNVS, to
> keep VDD_DRAM active during standby.

There is something I'm not quite sure I understand. Lookin at the 
BD71847 data-sheet, the VDD_DRAM is OFF at READY.

(Page 27, Table 3-8. Voltage Rails ON/OFF for Respective Power State)

https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator_system/bd71847amwv-e.pdf

Please, explain.

Yours,
	-- Matti

> 
> Signed-off-by: Wolfgang Birkner <wolfgang.birkner@...g.com>
> Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
> 
> ---
> 
>   arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
> index ea8d741c6904..633874b3bf66 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
> @@ -94,7 +94,6 @@ bd71847: pmic@4b {
>   		pinctrl-0 = <&pinctrl_pmic>;
>   		interrupt-parent = <&gpio1>;
>   		interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
> -		rohm,reset-snvs-powered;
>   
>   		#clock-cells = <0>;
>   		clocks = <&osc_32k>;