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Some SD host controllers cannot handle extended use of 3.3V signaling. To accommodate these controllers, add a capability that requires us to negotiate the voltage down from 3.3V during card initialization. Signed-off-by: Kyle Roeschley <kyle.roeschley@ni.com> Signed-off-by: Jennifer Dahm <jennifer.dahm@ni.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>