linux-kernel - Re: [PATCH 3/8] arm64: dts: imx8mm-kontron: Set VDD

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Message-ID: <df454b06-3069-d369-e3c7-f2434d94f4af@kontron.de>
Date:   Tue, 5 Oct 2021 15:14:40 +0200
From:   Frieder Schrempf <frieder.schrempf@...tron.de>
To:     Shawn Guo <shawnguo@...nel.org>, Frieder Schrempf <frieder@...s.de>
Cc:     devicetree@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>, stable@...r.kernel.org,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH 3/8] arm64: dts: imx8mm-kontron: Set VDD_SNVS to 800 mV

On 05.10.21 08:56, Shawn Guo wrote:
> On Thu, Sep 30, 2021 at 05:56:26PM +0200, Frieder Schrempf wrote:
>> From: Frieder Schrempf <frieder.schrempf@...tron.de>
>>
>> According to the datasheet VDD_SNVS should be 800 mV, so let's
>> make sure that the voltage won't be different.
> 
> Could you share the datasheet?

Sure, it's here: https://www.nxp.com/docs/en/data-sheet/IMX8MMIEC.pdf.
See table 10 for the operating voltages.

>>
>> Fixes: 21c4f45b335f ("arm64: dts: Add the Kontron i.MX8M Mini SoMs and baseboards")
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
>> ---
>>  arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
>> index b12fb7ce6686..213014f59b46 100644
>> --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
>> +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
>> @@ -152,8 +152,8 @@ reg_nvcc_snvs: LDO1 {
>>  
>>  			reg_vdd_snvs: LDO2 {
>>  				regulator-name = "ldo2";
>> -				regulator-min-microvolt = <850000>;
>> -				regulator-max-microvolt = <900000>;
>> +				regulator-min-microvolt = <800000>;
>> +				regulator-max-microvolt = <800000>;
>>  				regulator-boot-on;
>>  				regulator-always-on;
>>  			};
>> -- 
>> 2.33.0
>>