linux-kernel - Re: [PATCH] ARM: dts: imx7d-sdb: Make SW2's voltage fixed

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Date:   Wed, 29 May 2019 10:25:10 +0000
From:   Leonard Crestez <leonard.crestez@....com>
To:     Anson Huang <anson.huang@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "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] ARM: dts: imx7d-sdb: Make SW2's voltage fixed

On 29.05.2019 09:49, Anson.Huang@....com wrote:
> From: Anson Huang <Anson.Huang@....com>
> 
> On i.MX7D SDB board, SW2 supplies a lot of peripheral devices,
> its voltage should be fixed at 1.8V. The commit 43967d9b5a7c
> ("ARM: dts: imx7d-sdb: Assign corresponding power supply for LDOs")
> assigns SW2 as the supplier of vdd1p0d, and when its comsumers
> pcie-phy/mipi-phy try to set the vdd1p0d to 1.0V, regulator core
> will also set SW2 to its best(min) voltage to 1.5V, and it will
> lead to board reset.
> 
> This patch makes SW2's voltage fixed at 1.8V to avoid this issue.
> 
> Fixes: 43967d9b5a7c ("ARM: dts: imx7d-sdb: Assign corresponding power supply for LDOs")
> Reported-by: Leonard Crestez <leonard.crestez@....com>
> Signed-off-by: Anson Huang <Anson.Huang@....com>

Reviewed-by: Leonard Crestez <leonard.crestez@....com>

Other boards don't seem to be affected by the original series.