Blackfin: bfin_spi.h: add MMR peripheral layout

#define BIT_STU_SENDOVER    0x0001

#define BIT_STU_RECVFULL    0x0020

/*

 * All Blackfin system MMRs are padded to 32bits even if the register

 * itself is only 16bits.  So use a helper macro to streamline this.

 */

#define __BFP(m) u16 m; u16 __pad_##m

/*

 * bfin spi registers layout

 */

struct bfin_spi_regs {

	__BFP(ctl);

	__BFP(flg);

	__BFP(stat);

	__BFP(tdbr);

	__BFP(rdbr);

	__BFP(baud);

	__BFP(shadow);

};

#define MAX_CTRL_CS          8  /* cs in spi controller */

/* device.platform_data for SSP controller devices */