linux-kernel - Re: [PATCH v2 01/12] fix: arm64: dts: replace wrong regulator on ap emmc

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Message-ID: <20210211105222.GY1463@shell.armlinux.org.uk>
Date:   Thu, 11 Feb 2021 10:52:22 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     kostap@...vell.com, Jon Nettleton <jon@...id-run.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, robh+dt@...nel.org,
        sebastian.hesselbarth@...il.com, gregory.clement@...tlin.com,
        andrew@...n.ch, mw@...ihalf.com, jaz@...ihalf.com,
        nadavh@...vell.com, stefanc@...vell.com, bpeled@...vell.com
Subject: Re: [PATCH v2 01/12] fix: arm64: dts: replace wrong regulator on ap
 emmc

On Wed, Feb 10, 2021 at 04:09:38PM +0200, kostap@...vell.com wrote:
> From: Konstantin Porotchkin <kostap@...vell.com>
> 
> Replace wrong regulator in AP0 eMMC definition on MacchiatoBIN
> board with 3.3V regulator.
> The MacchiatoBIN board has no 1.8V regulator connected to AP0
> eMMC (ap0_sdhci0) interface.

There seems to be some variability between Macchiatobin versions
according to the schematics.

The VDDO_H supply is connected to the eMMC VCCQ pins, and is also
connected to the AP_VDDO_H pins. It is wired to the 1.8V regulator
on rev 1.1 schematics, but hard-wired to the 3.3V regulator on
rev 1.3 schematics.

This needs clarification from SolidRun before the patch can be
accepted - was VDDO_H ever wired to the 1.8V regulator on production
hardware?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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