libertas SPI Interface and the GPIO / chipselect issue

Sebastian Andrzej Siewior bigeasy at
Fri May 22 14:02:24 EDT 2009

* Andrey Yurovsky | 2009-05-22 09:42:16 [-0700]:

>> Any comments on this?
>Hi Sebastian.  We're indeed working on converting the transfers to
>spi_async() for other reasons, but that's an interesting point.  For
>GSPI we require "transaction"-style chip select, and if all
>controllers can do that, we're fine, however many of the ones I've
>seen toggle the chip select every X bytes, where X is the register
>size (8, 16, or 32-bit) regardless of how the host sees it.

That's why I've put David Brownell on Cc because I'm not sure if this is
the correct way to go / if that is what the device driver can expect
from host driver.

> -Andrey


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