[OpenWrt-Devel] SPI 104 MHz on ar7240/Spansion S25FL032P
rosenp at gmail.com
Mon Feb 10 07:02:52 EST 2020
On Mon, Feb 10, 2020 at 3:25 AM Adrian Schmutzler
<mail at adrianschmutzler.de> wrote:
> while reviewing the PR for the TL-WA830REv1 , 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?
>Sounds bogus. I remember on mt7621 the speed pretty much capped out at 80MHz even though the chip supports higher.
> Adrian Schmutzler
>  https://github.com/openwrt/openwrt/pull/2752#discussion_r375829096
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