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

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Message-ID: <20190605091659.GM29853@dragon>
Date:   Wed, 5 Jun 2019 17:17:01 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Anson.Huang@....com
Cc:     robh+dt@...nel.org, mark.rutland@....com, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Linux-imx@....com
Subject: Re: [PATCH] ARM: dts: imx7d-sdb: Make SW2's voltage fixed

On Wed, May 29, 2019 at 02:50:56PM +0800, 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>

Applied, thanks.