linux-kernel - RE: [PATCH v2 2/2] arm64: dts: imx8mn-ddr4-evk: correct ldo1/ldo2 voltage range

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Message-ID: <AM6PR04MB49662AC5F1859E61796A960A80B70@AM6PR04MB4966.eurprd04.prod.outlook.com>
Date:   Thu, 21 May 2020 10:51:54 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Robin Gong <yibin.gong@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        Anson Huang <anson.huang@....com>, Peng Fan <peng.fan@....com>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH v2 2/2] arm64: dts: imx8mn-ddr4-evk: correct ldo1/ldo2
 voltage range

> From: Robin Gong <yibin.gong@....com>
> Sent: Thursday, May 21, 2020 10:18 PM
> 
> Correct ldo1 voltage range from wrong high group(3.0v~3.3v) to low group
> (1.6v~1.9v) because the ldo1 should be 1.8v. Actually, two voltage groups have
> been supported at bd718x7-regulator driver, hence, just corrrect the voltage
> range to 1.6v~3.3v. For ldo2@...v, correct voltage range too.
> Otherwise, ldo1 would be kept @3.0v and ldo2@...v which violate i.mx8mn
> datasheet as the below warning log in kernel:
> 
> [    0.995524] LDO1: Bringing 1800000uV into 3000000-3000000uV
> [    0.999196] LDO2: Bringing 800000uV into 900000-900000uV
> 
> Signed-off-by: Robin Gong <yibin.gong@....com>

Reviewed-by: Dong Aisheng <aisheng.dong@....com>

Regards
Aisheng