OpenCloudOS-Kernel/drivers/mmc/core/Kconfig

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#
# MMC core configuration
#
config MMC_CLKGATE
bool "MMC host clock gating"
help
This will attempt to aggressively gate the clock to the MMC card.
This is done to save power due to gating off the logic and bus
noise when the MMC card is not in use. Your host driver has to
support handling this in order for it to be of any use.
If unsure, say N.