Alex Zhao
b59b1c0040
mmc: add a file to debugfs for changing host max clock at runtime
Usage is as follows:
rk3566_rgo:/ # cat /sys/kernel/debug/mmc1/max_clock
150000000
rk3566_rgo:/ # echo 200000000 > /sys/kernel/debug/mmc1/max_clock
rk3566_rgo:/ # cat /sys/kernel/debug/mmc1/max_clock
200000000
rk3566_rgo:/ # echo 200000000 > /sys/kernel/debug/mmc1/clock
rk3566_rgo:/ # dmesg -c
[ 285.884348] mmc_host mmc1: Bus speed (slot 0) = 198000000Hz (slot req 200000000Hz, actual 198000000HZ div = 0)
Signed-off-by: Alex Zhao <zzc@rock-chips.com>
Change-Id: I7ac9649b231c50b0c6c066407e28954e8c94510c
2021-01-06 15:18:42 +08:00
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