[OpenWrt-Devel] ar71xx: spi difference between internal chip select and gpios as chip select

Alexander Couzens lynxis at fe80.eu
Thu Jul 23 10:35:39 EDT 2015


I would like to integrate the upstream devicetree ath79-spi patches into the ar71xx tree.
But there are some improvements upstream which conflicts to use, they dropped the spi_controller_data,
which is used by some boards to define the type of chip select. The type is internal
or gpio. The internal chip selects are routed to gpios in the end.

Is there a notable difference between the internal chip select and the direct accessed gpio variant?
Did someone any performance tests on this?

Alexander Couzens

mail: lynxis at fe80.eu
jabber: lynxis at jabber.ccc.de
mobile: +4915123277221
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