mfd: Prepare for separating spi and i2c mc13xxx-core backends
This patch abstracts the bus specific operations from the driver core. Generic init and cleanup is consolidated into mc13xxx_common_*. spi specific functions are renamed to reflect such. (The irq member of the mc13xxx struct is no longer redundant, it's used to store the irq for cleanup time). Signed-off-by: NMarc Reilly <marc@cpdesign.com.au> Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>
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