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

[Rosen Penev]

On Mon, Feb 10, 2020 at 3:25 AM Adrian Schmutzler
<mail at adrianschmutzler.de> wrote:
>
> Hi,
>
> 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.
> https://github.com/openwrt/openwrt/blob/master/target/linux/ath79/dts/ar9331_tpl
> ink_tl-mr3020-v1.dts#L123
>
> 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.

> Best
>
> Adrian Schmutzler
>
> [1] https://github.com/openwrt/openwrt/pull/2752#discussion_r375829096
>
>
>
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