[PATCH for-next] spi: bcm53xx: add spi_flash_read callback for MMIO-based reads

[Mark Brown]

On Mon, Apr 18, 2016 at 01:38:28PM +0200, Rafał Miłecki wrote:

> What shall we do if spi_flash_read fails? Should we always fallback to
> the standard SPI flash read? Or should we standarize error codes
> returned by spi_flash_read and fallback on some particular error code
> only?

I'm not sure, probably just fall back all the time.
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