[MTK] How to check sdcard frequency and mode

文摘 Kernel MediaTek 2021-11-10 阅读:375
tb8167p5_64_bsp:/ #  cat  /sys/kernel/debug/mmc1/ios
clock:          200000000 Hz
vdd:            21 (3.3 ~ 3.4 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      2 (4 bits)
timing spec:    6 (sd uhs SDR104)
signal voltage: 0 (1.80 V)
driver type:    0 (driver type B)

It indicates that sdcard mode is SDR104 mode with 200MHZ clock and bus width is 4-bit.


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