[OpenWrt-Devel] [PATCH v2 1/2] ramips: second spi device on rt5350

Álvaro Fernández Rojas noltari at gmail.com
Tue Aug 19 15:48:09 EDT 2014

El 19/08/2014 21:43, jonsmirl at gmail.com escribió:
> How is the clock speed wrong?

The lowest speed the RT5350 SPI controller can achieve is System Clock / 128.
System Clock = 120MHz
Lowest SPI Clock = 120MHz / 128 = 937.5KHz

However, the MMC/SD cards need to be initialized at 100-400KHz.
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