linux-kernel - Re: [PATCH 4/4] mmc: mmci: add hs200 support for stm32 sdmmc

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Date:   Thu, 16 Dec 2021 10:14:45 +0100
From:   Marek Vasut <marex@...x.de>
To:     Yann Gautier <yann.gautier@...s.st.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vladimir Zapolskiy <vz@...ia.com>,
        u.kleine-koenig@...gutronix.de,
        Christophe Kerello <christophe.kerello@...s.st.com>,
        Ludovic Barre <ludovic.barre@...s.st.com>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/4] mmc: mmci: add hs200 support for stm32 sdmmc

On 12/15/21 15:17, Yann Gautier wrote:
> Use feedback clock for HS200 mode, as for SDR104.
> The HS200 mode can be enabled through DT by using mmc-hs200-1_8v.
> It is possible to use it on STM32MP13, but not STM32MP15 platforms.

HS200 is possible even on the MP15, it just doesn't yield any 
(performance) benefits due to the slower bus clock (125 MHz or so?), so 
it isn't worth enabling it on MP15. It is nice to see MP13 can do better.