linux-kernel - Re: [PATCH 1/3] dt-bindings: mmc: Add 'fixed-emmc-driver-type-hs{200,400}'

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Message-ID: <CACRpkdYyYAaW8AYqpC3E7eBx25-3yJqitSE=0yVfxCDtM-CwqA@mail.gmail.com>
Date:   Wed, 13 Nov 2019 00:11:11 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Rob Herring <robh@...nel.org>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Mathieu Malaterre <malat@...ian.org>,
        Pavel Machek <pavel@....cz>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Eugeniu Rosca <roscaeugeniu@...il.com>
Subject: Re: [PATCH 1/3] dt-bindings: mmc: Add 'fixed-emmc-driver-type-hs{200,400}'

On Tue, Nov 12, 2019 at 10:19 PM Wolfram Sang <wsa@...-dreams.de> wrote:

> What I have seen so far: setting drive strength alone is more on the
> rare side. Setting specific values for default and HS200/400 seems even
> more rare to me. With this patchset, it is the first time I hear about
> it.

Like I wrote to Eugeniu this sounds like some kind of errata
for the eMMC ext CSD and should likely be a card quirk rather
than some generic device tree properties.

I might be wrong, we'll hash it out.

Yours,
Linus Walleij