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Merge series from Andy Shevchenko <andriy.shevchenko@linux.intel.com>: Recently in the discussion with David the idea of having a common helper popped up. The helper converts the given bits per word to bytes. The result will always be power-of-two (e.g. for 37 bits it returns 8 bytes) or 0 for 0 input. More details are in the respective code comment. This mini-series introduces it and replaces current users under drivers/spi and we expect more (and possibly some lurking in other subsystems).