Re: [PATCH v2] spi: bitbang: Make setup_transfer() callback optional

[Mark Brown]

On Tue, Apr 14, 2015 at 03:40:17PM +0200, Pelle Nilsson wrote:
> Some controller drivers have no need of this callback (spi-altera even
> causes a NULL pointer dereference because it doesn't register the callback,
> falsely assuming that it is already optional).

I've applied this but really for something like this the commit message
should be explaining *why* it's reasonable for the callback to be
omitted.

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