mmc: core: Extend sysfs with OCR register
Registers CID and CSD are already exported through sysfs so let's make this interface complete by adding missing OCR register. Signed-off-by: NBojan Prtvar <prtvar.b@gmail.com> Reviewed-by: NWolfram Sang <wsa@the-dreams.de> Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
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