Merge remote-tracking branch 'spi/topic/bpw' into spi-next

	/* bitmask of supported bits_per_word for transfers */

	u32			bits_per_word_mask;

#define SPI_BPW_MASK(bits) BIT((bits) - 1)

#define SPI_BIT_MASK(bits) (((bits) == 32) ? ~0UL : (BIT(bits) - 1))

#define SPI_BIT_MASK(bits) (((bits) == 32) ? ~0U : (BIT(bits) - 1))

#define SPI_BPW_RANGE_MASK(min, max) (SPI_BIT_MASK(max) - SPI_BIT_MASK(min - 1))

	/* other constraints relevant to this driver */