I've created a custom imx6ull board and therefore copied dts from imx6ul-14x14 evk board.
In this dts file, there are 3 pinctrl for "default", 100MHz and 200MHz.
Current result of cat /sys/kernel/debug/mmc0/ios is:
clock: 50000000 Hz
actual clock: 49500000 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: 2 (sd high-speed)
signal voltage: 0 (3.30 V)
driver type: 0 (driver type B)
How is it possible to increase clock and speed? Which settings have to be changed?
Currently, read from sd card is quite slow.