Re: [PATCH v5 08/10] spi: expose master transfer size limitation.

[Mark Brown]

On Tue, Dec 01, 2015 at 04:51:06PM -0000, Michal Suchanek wrote:
> On some SPI controllers it is not feasible to transfer arbitrary amount
> of data at once.
> 
> When the limit on transfer size is a few kilobytes at least it makes
> sense to use the SPI hardware rather than reverting to gpio driver.

> +	/*
> +	 * on some hardware transfer size may be constrained
> +	 * the limit may depend on device transfer settings
> +	 */
> +	size_t (*max_transfer_size)(struct spi_device *spi);

Heiner submitted a *very* similar patch just now with a straight
variable plus accessor instead of a function and using a name with _msg.
I'm ambivalent on the implementation but prefer the naming here since
that's more the limitation we're trying to express I think (some
hardware does have limiations about multple transfers too).  Can the two
of you come up with something that works for both of you?

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