Re: controller_data handling through spidev.c

[Feng Tang <feng.tang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

> 
> It's a sibling to the platform_data field, and
> should be set up with that.  Neither one should
> be assigned or understood by protocol drivers.


> 
> Historically, controller_data was used ISTR to
> cope with tuning that the PXA SPI controller
> required (DMA etc).  Most controllers should
> have no need for it.
> 

DW spi driver is also using the controller data, but as you said
protocol driver itself doesn't need set it. Platform code where
that spi device is registered (by spi_register_board_info) should
set up the controller data.

Thanks,
Feng

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