linux-kernel - [RFC 0/2] Add device tree property and quirk for supporting sdhci

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Message-Id: <1474660869-15532-1-git-send-email-zach.brown@ni.com>
Date:   Fri, 23 Sep 2016 15:01:07 -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 0/2] Add device tree property and quirk for supporting sdhci

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.

Chen Yee Chew (1):
  sdhci: Prevent SD from doing high-speed timing when
    sd-broken-highspeed     property is set

Zach Brown (1):
  sdhci: Add device tree property sd-broken-highspeed

 Documentation/devicetree/bindings/mmc/mmc.txt | 2 ++
 arch/arm/boot/dts/ni-77D5.dts                 | 1 -
 drivers/mmc/host/sdhci-pltfm.c                | 3 +++
 drivers/mmc/host/sdhci.c                      | 3 ++-
 drivers/mmc/host/sdhci.h                      | 2 ++
 5 files changed, 9 insertions(+), 2 deletions(-)

-- 
2.7.4