[OpenWrt-Devel] SPI 104 MHz on ar7240/Spansion S25FL032P

Adrian Schmutzler mail at adrianschmutzler.de
Mon Feb 10 06:25:13 EST 2020


while reviewing the PR for the TL-WA830REv1 [1], I was wondered about the
unusually high
spi-max-frequency = <104000000>;

The author states it's running stable, the datasheet tells

Normal READ (Serial): 40-MHz clock rate
FAST_READ (Serial): 104-MHz clock rate (maximum)
DUAL I/O FAST_READ: 80-MHz clock rate or 20 MB/s effective data rate
QUAD I/O FAST_READ: 80 MHz clock rate or 40 MB/s effective data rate

and according to the author, there are other boards with the same chip and this
frequency, e.g.

So, can somebody lend me some expertise whether the value is okay?


Adrian Schmutzler

[1] https://github.com/openwrt/openwrt/pull/2752#discussion_r375829096

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