linux-kernel - [RFC v2 0/2] Add device tree property and driver behavior for supporting sdhci configurations with broken highspeed.

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Date:   Wed, 12 Oct 2016 13:40:54 -0500
From:   Zach Brown <zach.brown@...com>
To:     ulf.hansson@...aro.org
Cc:     adrian.hunter@...el.com, robh+dt@...nel.org, mark.rutland@....com,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, zach.brown@...com
Subject: [RFC v2 0/2] Add device tree property and driver behavior for supporting sdhci configurations with broken highspeed.

Some board configurations can not support sd highspeed mode due to the distance
between the card slot and the controller. The card and controller report that
they are capable of highspeed however, so we need a mechanism for specifying
that the setup is incapable of supporting highspeed mode.

The first patch adds documentation about a new devicetree property
sd-broken-highspeed.

The second patch keeps the sd controller and card from going into highspeed
mode when the property is set.

v2:
 * changed sd-broken-highspeed to broken-highspeed
 * Removed new quirk, instead read of property when would've checked quirk

Zach Brown (2):
  sdhci: Add device tree property broken-highspeed
  sdhci: Prevent SD from doing high-speed timing when broken-highspeed
    property is set

 Documentation/devicetree/bindings/mmc/mmc.txt | 2 ++
 drivers/mmc/host/sdhci.c                      | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

--
2.7.4