mmc: mmci: Add DT bindings for feedback clock pin
The ST Micro variant supports the option of using a feedback clock signal in favor of the clockout pin when latching incoming signals on the data bus. Since this is matter of how pins are being routed we need to provide a new DT binding to be able to configure this through DT. Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org> Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
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