mmc: core: Extend mmc_of_parse() to check for mmc-ddr-3_3v
When mmc_of_parse() finds the binding, it sets the mmc cap, MMC_CAP_3_3V_DDR, which informs the core whether eMMC DDR at 3.3V I/O is supported by the mmc host. Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org> Reviewed-by: NShawn Lin <shawn.lin@rock-chips.com> Tested-by: NJan Glauber <jglauber@cavium.com> Tested-by: NStefan Wahren <stefan.wahren@i2se.com>
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