[PATCH 10/20] regmap: _regmap_raw_multi_reg_write: Add reg_write() support

[Mark Brown]

On Wed, Aug 12, 2015 at 12:12:35PM +0200, Markus Pargmann wrote:
> Define a fallback for busses which do not define a write() function.
> Instead we write one register at a time using reg_write().
> 
> Without this patch, _regmap_raw_multi_reg_write would break as it tries
> to call bus->write() without checking if it exists before.

Why are we trying to use multi write APIs in the first place if we can't
do raw I/O?
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