xref: /openbmc/u-boot/include/spi.h (revision abdc7b8a)
1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Common SPI Interface: Controller-specific definitions
4  *
5  * (C) Copyright 2001
6  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
7  */
8 
9 #ifndef _SPI_H_
10 #define _SPI_H_
11 
12 #include <common.h>
13 
14 /* SPI mode flags */
15 #define SPI_CPHA	BIT(0)			/* clock phase */
16 #define SPI_CPOL	BIT(1)			/* clock polarity */
17 #define SPI_MODE_0	(0|0)			/* (original MicroWire) */
18 #define SPI_MODE_1	(0|SPI_CPHA)
19 #define SPI_MODE_2	(SPI_CPOL|0)
20 #define SPI_MODE_3	(SPI_CPOL|SPI_CPHA)
21 #define SPI_CS_HIGH	BIT(2)			/* CS active high */
22 #define SPI_LSB_FIRST	BIT(3)			/* per-word bits-on-wire */
23 #define SPI_3WIRE	BIT(4)			/* SI/SO signals shared */
24 #define SPI_LOOP	BIT(5)			/* loopback mode */
25 #define SPI_SLAVE	BIT(6)			/* slave mode */
26 #define SPI_PREAMBLE	BIT(7)			/* Skip preamble bytes */
27 #define SPI_TX_BYTE	BIT(8)			/* transmit with 1 wire byte */
28 #define SPI_TX_DUAL	BIT(9)			/* transmit with 2 wires */
29 #define SPI_TX_QUAD	BIT(10)			/* transmit with 4 wires */
30 #define SPI_RX_SLOW	BIT(11)			/* receive with 1 wire slow */
31 #define SPI_RX_DUAL	BIT(12)			/* receive with 2 wires */
32 #define SPI_RX_QUAD	BIT(13)			/* receive with 4 wires */
33 
34 /* Header byte that marks the start of the message */
35 #define SPI_PREAMBLE_END_BYTE	0xec
36 
37 #define SPI_DEFAULT_WORDLEN	8
38 
39 #ifdef CONFIG_DM_SPI
40 /* TODO(sjg@chromium.org): Remove this and use max_hz from struct spi_slave */
41 struct dm_spi_bus {
42 	uint max_hz;
43 };
44 
45 /**
46  * struct dm_spi_platdata - platform data for all SPI slaves
47  *
48  * This describes a SPI slave, a child device of the SPI bus. To obtain this
49  * struct from a spi_slave, use dev_get_parent_platdata(dev) or
50  * dev_get_parent_platdata(slave->dev).
51  *
52  * This data is immuatable. Each time the device is probed, @max_hz and @mode
53  * will be copied to struct spi_slave.
54  *
55  * @cs:		Chip select number (0..n-1)
56  * @max_hz:	Maximum bus speed that this slave can tolerate
57  * @mode:	SPI mode to use for this device (see SPI mode flags)
58  */
59 struct dm_spi_slave_platdata {
60 	unsigned int cs;
61 	uint max_hz;
62 	uint mode;
63 };
64 
65 #endif /* CONFIG_DM_SPI */
66 
67 /**
68  * struct spi_slave - Representation of a SPI slave
69  *
70  * For driver model this is the per-child data used by the SPI bus. It can
71  * be accessed using dev_get_parent_priv() on the slave device. The SPI uclass
72  * sets uip per_child_auto_alloc_size to sizeof(struct spi_slave), and the
73  * driver should not override it. Two platform data fields (max_hz and mode)
74  * are copied into this structure to provide an initial value. This allows
75  * them to be changed, since we should never change platform data in drivers.
76  *
77  * If not using driver model, drivers are expected to extend this with
78  * controller-specific data.
79  *
80  * @dev:		SPI slave device
81  * @max_hz:		Maximum speed for this slave
82  * @speed:		Current bus speed. This is 0 until the bus is first
83  *			claimed.
84  * @bus:		ID of the bus that the slave is attached to. For
85  *			driver model this is the sequence number of the SPI
86  *			bus (bus->seq) so does not need to be stored
87  * @cs:			ID of the chip select connected to the slave.
88  * @mode:		SPI mode to use for this slave (see SPI mode flags)
89  * @wordlen:		Size of SPI word in number of bits
90  * @max_read_size:	If non-zero, the maximum number of bytes which can
91  *			be read at once.
92  * @max_write_size:	If non-zero, the maximum number of bytes which can
93  *			be written at once.
94  * @memory_map:		Address of read-only SPI flash access.
95  * @flags:		Indication of SPI flags.
96  */
97 struct spi_slave {
98 #ifdef CONFIG_DM_SPI
99 	struct udevice *dev;	/* struct spi_slave is dev->parentdata */
100 	uint max_hz;
101 	uint speed;
102 #else
103 	unsigned int bus;
104 	unsigned int cs;
105 #endif
106 	uint mode;
107 	unsigned int wordlen;
108 	unsigned int max_read_size;
109 	unsigned int max_write_size;
110 	void *memory_map;
111 
112 	u8 flags;
113 #define SPI_XFER_BEGIN		BIT(0)	/* Assert CS before transfer */
114 #define SPI_XFER_END		BIT(1)	/* Deassert CS after transfer */
115 #define SPI_XFER_ONCE		(SPI_XFER_BEGIN | SPI_XFER_END)
116 #define SPI_XFER_MMAP		BIT(2)	/* Memory Mapped start */
117 #define SPI_XFER_MMAP_END	BIT(3)	/* Memory Mapped End */
118 };
119 
120 /**
121  * Initialization, must be called once on start up.
122  *
123  * TODO: I don't think we really need this.
124  */
125 void spi_init(void);
126 
127 /**
128  * spi_do_alloc_slave - Allocate a new SPI slave (internal)
129  *
130  * Allocate and zero all fields in the spi slave, and set the bus/chip
131  * select. Use the helper macro spi_alloc_slave() to call this.
132  *
133  * @offset:	Offset of struct spi_slave within slave structure.
134  * @size:	Size of slave structure.
135  * @bus:	Bus ID of the slave chip.
136  * @cs:		Chip select ID of the slave chip on the specified bus.
137  */
138 void *spi_do_alloc_slave(int offset, int size, unsigned int bus,
139 			 unsigned int cs);
140 
141 /**
142  * spi_alloc_slave - Allocate a new SPI slave
143  *
144  * Allocate and zero all fields in the spi slave, and set the bus/chip
145  * select.
146  *
147  * @_struct:	Name of structure to allocate (e.g. struct tegra_spi).
148  *		This structure must contain a member 'struct spi_slave *slave'.
149  * @bus:	Bus ID of the slave chip.
150  * @cs:		Chip select ID of the slave chip on the specified bus.
151  */
152 #define spi_alloc_slave(_struct, bus, cs) \
153 	spi_do_alloc_slave(offsetof(_struct, slave), \
154 			    sizeof(_struct), bus, cs)
155 
156 /**
157  * spi_alloc_slave_base - Allocate a new SPI slave with no private data
158  *
159  * Allocate and zero all fields in the spi slave, and set the bus/chip
160  * select.
161  *
162  * @bus:	Bus ID of the slave chip.
163  * @cs:		Chip select ID of the slave chip on the specified bus.
164  */
165 #define spi_alloc_slave_base(bus, cs) \
166 	spi_do_alloc_slave(0, sizeof(struct spi_slave), bus, cs)
167 
168 /**
169  * Set up communications parameters for a SPI slave.
170  *
171  * This must be called once for each slave. Note that this function
172  * usually doesn't touch any actual hardware, it only initializes the
173  * contents of spi_slave so that the hardware can be easily
174  * initialized later.
175  *
176  * @bus:	Bus ID of the slave chip.
177  * @cs:		Chip select ID of the slave chip on the specified bus.
178  * @max_hz:	Maximum SCK rate in Hz.
179  * @mode:	Clock polarity, clock phase and other parameters.
180  *
181  * Returns: A spi_slave reference that can be used in subsequent SPI
182  * calls, or NULL if one or more of the parameters are not supported.
183  */
184 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
185 		unsigned int max_hz, unsigned int mode);
186 
187 /**
188  * Free any memory associated with a SPI slave.
189  *
190  * @slave:	The SPI slave
191  */
192 void spi_free_slave(struct spi_slave *slave);
193 
194 /**
195  * Claim the bus and prepare it for communication with a given slave.
196  *
197  * This must be called before doing any transfers with a SPI slave. It
198  * will enable and initialize any SPI hardware as necessary, and make
199  * sure that the SCK line is in the correct idle state. It is not
200  * allowed to claim the same bus for several slaves without releasing
201  * the bus in between.
202  *
203  * @slave:	The SPI slave
204  *
205  * Returns: 0 if the bus was claimed successfully, or a negative value
206  * if it wasn't.
207  */
208 int spi_claim_bus(struct spi_slave *slave);
209 
210 /**
211  * Release the SPI bus
212  *
213  * This must be called once for every call to spi_claim_bus() after
214  * all transfers have finished. It may disable any SPI hardware as
215  * appropriate.
216  *
217  * @slave:	The SPI slave
218  */
219 void spi_release_bus(struct spi_slave *slave);
220 
221 /**
222  * Set the word length for SPI transactions
223  *
224  * Set the word length (number of bits per word) for SPI transactions.
225  *
226  * @slave:	The SPI slave
227  * @wordlen:	The number of bits in a word
228  *
229  * Returns: 0 on success, -1 on failure.
230  */
231 int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen);
232 
233 /**
234  * SPI transfer
235  *
236  * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
237  * "bitlen" bits in the SPI MISO port.  That's just the way SPI works.
238  *
239  * The source of the outgoing bits is the "dout" parameter and the
240  * destination of the input bits is the "din" parameter.  Note that "dout"
241  * and "din" can point to the same memory location, in which case the
242  * input data overwrites the output data (since both are buffered by
243  * temporary variables, this is OK).
244  *
245  * spi_xfer() interface:
246  * @slave:	The SPI slave which will be sending/receiving the data.
247  * @bitlen:	How many bits to write and read.
248  * @dout:	Pointer to a string of bits to send out.  The bits are
249  *		held in a byte array and are sent MSB first.
250  * @din:	Pointer to a string of bits that will be filled in.
251  * @flags:	A bitwise combination of SPI_XFER_* flags.
252  *
253  * Returns: 0 on success, not 0 on failure
254  */
255 int  spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
256 		void *din, unsigned long flags);
257 
258 /* Copy memory mapped data */
259 void spi_flash_copy_mmap(void *data, void *offset, size_t len);
260 
261 /**
262  * Determine if a SPI chipselect is valid.
263  * This function is provided by the board if the low-level SPI driver
264  * needs it to determine if a given chipselect is actually valid.
265  *
266  * Returns: 1 if bus:cs identifies a valid chip on this board, 0
267  * otherwise.
268  */
269 int spi_cs_is_valid(unsigned int bus, unsigned int cs);
270 
271 #ifndef CONFIG_DM_SPI
272 /**
273  * Activate a SPI chipselect.
274  * This function is provided by the board code when using a driver
275  * that can't control its chipselects automatically (e.g.
276  * common/soft_spi.c). When called, it should activate the chip select
277  * to the device identified by "slave".
278  */
279 void spi_cs_activate(struct spi_slave *slave);
280 
281 /**
282  * Deactivate a SPI chipselect.
283  * This function is provided by the board code when using a driver
284  * that can't control its chipselects automatically (e.g.
285  * common/soft_spi.c). When called, it should deactivate the chip
286  * select to the device identified by "slave".
287  */
288 void spi_cs_deactivate(struct spi_slave *slave);
289 
290 /**
291  * Set transfer speed.
292  * This sets a new speed to be applied for next spi_xfer().
293  * @slave:	The SPI slave
294  * @hz:		The transfer speed
295  */
296 void spi_set_speed(struct spi_slave *slave, uint hz);
297 #endif
298 
299 /**
300  * Write 8 bits, then read 8 bits.
301  * @slave:	The SPI slave we're communicating with
302  * @byte:	Byte to be written
303  *
304  * Returns: The value that was read, or a negative value on error.
305  *
306  * TODO: This function probably shouldn't be inlined.
307  */
308 static inline int spi_w8r8(struct spi_slave *slave, unsigned char byte)
309 {
310 	unsigned char dout[2];
311 	unsigned char din[2];
312 	int ret;
313 
314 	dout[0] = byte;
315 	dout[1] = 0;
316 
317 	ret = spi_xfer(slave, 16, dout, din, SPI_XFER_BEGIN | SPI_XFER_END);
318 	return ret < 0 ? ret : din[1];
319 }
320 
321 #ifdef CONFIG_DM_SPI
322 
323 /**
324  * struct spi_cs_info - Information about a bus chip select
325  *
326  * @dev:	Connected device, or NULL if none
327  */
328 struct spi_cs_info {
329 	struct udevice *dev;
330 };
331 
332 /**
333  * struct struct dm_spi_ops - Driver model SPI operations
334  *
335  * The uclass interface is implemented by all SPI devices which use
336  * driver model.
337  */
338 struct dm_spi_ops {
339 	/**
340 	 * Claim the bus and prepare it for communication.
341 	 *
342 	 * The device provided is the slave device. It's parent controller
343 	 * will be used to provide the communication.
344 	 *
345 	 * This must be called before doing any transfers with a SPI slave. It
346 	 * will enable and initialize any SPI hardware as necessary, and make
347 	 * sure that the SCK line is in the correct idle state. It is not
348 	 * allowed to claim the same bus for several slaves without releasing
349 	 * the bus in between.
350 	 *
351 	 * @dev:	The SPI slave
352 	 *
353 	 * Returns: 0 if the bus was claimed successfully, or a negative value
354 	 * if it wasn't.
355 	 */
356 	int (*claim_bus)(struct udevice *dev);
357 
358 	/**
359 	 * Release the SPI bus
360 	 *
361 	 * This must be called once for every call to spi_claim_bus() after
362 	 * all transfers have finished. It may disable any SPI hardware as
363 	 * appropriate.
364 	 *
365 	 * @dev:	The SPI slave
366 	 */
367 	int (*release_bus)(struct udevice *dev);
368 
369 	/**
370 	 * Set the word length for SPI transactions
371 	 *
372 	 * Set the word length (number of bits per word) for SPI transactions.
373 	 *
374 	 * @bus:	The SPI slave
375 	 * @wordlen:	The number of bits in a word
376 	 *
377 	 * Returns: 0 on success, -ve on failure.
378 	 */
379 	int (*set_wordlen)(struct udevice *dev, unsigned int wordlen);
380 
381 	/**
382 	 * SPI transfer
383 	 *
384 	 * This writes "bitlen" bits out the SPI MOSI port and simultaneously
385 	 * clocks "bitlen" bits in the SPI MISO port.  That's just the way SPI
386 	 * works.
387 	 *
388 	 * The source of the outgoing bits is the "dout" parameter and the
389 	 * destination of the input bits is the "din" parameter.  Note that
390 	 * "dout" and "din" can point to the same memory location, in which
391 	 * case the input data overwrites the output data (since both are
392 	 * buffered by temporary variables, this is OK).
393 	 *
394 	 * spi_xfer() interface:
395 	 * @dev:	The slave device to communicate with
396 	 * @bitlen:	How many bits to write and read.
397 	 * @dout:	Pointer to a string of bits to send out.  The bits are
398 	 *		held in a byte array and are sent MSB first.
399 	 * @din:	Pointer to a string of bits that will be filled in.
400 	 * @flags:	A bitwise combination of SPI_XFER_* flags.
401 	 *
402 	 * Returns: 0 on success, not -1 on failure
403 	 */
404 	int (*xfer)(struct udevice *dev, unsigned int bitlen, const void *dout,
405 		    void *din, unsigned long flags);
406 
407 	/**
408 	 * Optimized handlers for SPI memory-like operations.
409 	 *
410 	 * Optimized/dedicated operations for interactions with SPI memory. This
411 	 * field is optional and should only be implemented if the controller
412 	 * has native support for memory like operations.
413 	 */
414 	const struct spi_controller_mem_ops *mem_ops;
415 
416 	/**
417 	 * Set transfer speed.
418 	 * This sets a new speed to be applied for next spi_xfer().
419 	 * @bus:	The SPI bus
420 	 * @hz:		The transfer speed
421 	 * @return 0 if OK, -ve on error
422 	 */
423 	int (*set_speed)(struct udevice *bus, uint hz);
424 
425 	/**
426 	 * Set the SPI mode/flags
427 	 *
428 	 * It is unclear if we want to set speed and mode together instead
429 	 * of separately.
430 	 *
431 	 * @bus:	The SPI bus
432 	 * @mode:	Requested SPI mode (SPI_... flags)
433 	 * @return 0 if OK, -ve on error
434 	 */
435 	int (*set_mode)(struct udevice *bus, uint mode);
436 
437 	/**
438 	 * Get information on a chip select
439 	 *
440 	 * This is only called when the SPI uclass does not know about a
441 	 * chip select, i.e. it has no attached device. It gives the driver
442 	 * a chance to allow activity on that chip select even so.
443 	 *
444 	 * @bus:	The SPI bus
445 	 * @cs:		The chip select (0..n-1)
446 	 * @info:	Returns information about the chip select, if valid.
447 	 *		On entry info->dev is NULL
448 	 * @return 0 if OK (and @info is set up), -ENODEV if the chip select
449 	 *	   is invalid, other -ve value on error
450 	 */
451 	int (*cs_info)(struct udevice *bus, uint cs, struct spi_cs_info *info);
452 };
453 
454 struct dm_spi_emul_ops {
455 	/**
456 	 * SPI transfer
457 	 *
458 	 * This writes "bitlen" bits out the SPI MOSI port and simultaneously
459 	 * clocks "bitlen" bits in the SPI MISO port.  That's just the way SPI
460 	 * works. Here the device is a slave.
461 	 *
462 	 * The source of the outgoing bits is the "dout" parameter and the
463 	 * destination of the input bits is the "din" parameter.  Note that
464 	 * "dout" and "din" can point to the same memory location, in which
465 	 * case the input data overwrites the output data (since both are
466 	 * buffered by temporary variables, this is OK).
467 	 *
468 	 * spi_xfer() interface:
469 	 * @slave:	The SPI slave which will be sending/receiving the data.
470 	 * @bitlen:	How many bits to write and read.
471 	 * @dout:	Pointer to a string of bits sent to the device. The
472 	 *		bits are held in a byte array and are sent MSB first.
473 	 * @din:	Pointer to a string of bits that will be sent back to
474 	 *		the master.
475 	 * @flags:	A bitwise combination of SPI_XFER_* flags.
476 	 *
477 	 * Returns: 0 on success, not -1 on failure
478 	 */
479 	int (*xfer)(struct udevice *slave, unsigned int bitlen,
480 		    const void *dout, void *din, unsigned long flags);
481 };
482 
483 /**
484  * spi_find_bus_and_cs() - Find bus and slave devices by number
485  *
486  * Given a bus number and chip select, this finds the corresponding bus
487  * device and slave device. Neither device is activated by this function,
488  * although they may have been activated previously.
489  *
490  * @busnum:	SPI bus number
491  * @cs:		Chip select to look for
492  * @busp:	Returns bus device
493  * @devp:	Return slave device
494  * @return 0 if found, -ENODEV on error
495  */
496 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
497 			struct udevice **devp);
498 
499 /**
500  * spi_get_bus_and_cs() - Find and activate bus and slave devices by number
501  *
502  * Given a bus number and chip select, this finds the corresponding bus
503  * device and slave device.
504  *
505  * If no such slave exists, and drv_name is not NULL, then a new slave device
506  * is automatically bound on this chip select.
507  *
508  * Ths new slave device is probed ready for use with the given speed and mode.
509  *
510  * @busnum:	SPI bus number
511  * @cs:		Chip select to look for
512  * @speed:	SPI speed to use for this slave
513  * @mode:	SPI mode to use for this slave
514  * @drv_name:	Name of driver to attach to this chip select
515  * @dev_name:	Name of the new device thus created
516  * @busp:	Returns bus device
517  * @devp:	Return slave device
518  * @return 0 if found, -ve on error
519  */
520 int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
521 			const char *drv_name, const char *dev_name,
522 			struct udevice **busp, struct spi_slave **devp);
523 
524 /**
525  * spi_chip_select() - Get the chip select for a slave
526  *
527  * @return the chip select this slave is attached to
528  */
529 int spi_chip_select(struct udevice *slave);
530 
531 /**
532  * spi_find_chip_select() - Find the slave attached to chip select
533  *
534  * @bus:	SPI bus to search
535  * @cs:		Chip select to look for
536  * @devp:	Returns the slave device if found
537  * @return 0 if found, -ENODEV on error
538  */
539 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp);
540 
541 /**
542  * spi_slave_ofdata_to_platdata() - decode standard SPI platform data
543  *
544  * This decodes the speed and mode for a slave from a device tree node
545  *
546  * @blob:	Device tree blob
547  * @node:	Node offset to read from
548  * @plat:	Place to put the decoded information
549  */
550 int spi_slave_ofdata_to_platdata(struct udevice *dev,
551 				 struct dm_spi_slave_platdata *plat);
552 
553 /**
554  * spi_cs_info() - Check information on a chip select
555  *
556  * This checks a particular chip select on a bus to see if it has a device
557  * attached, or is even valid.
558  *
559  * @bus:	The SPI bus
560  * @cs:		The chip select (0..n-1)
561  * @info:	Returns information about the chip select, if valid
562  * @return 0 if OK (and @info is set up), -ENODEV if the chip select
563  *	   is invalid, other -ve value on error
564  */
565 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info);
566 
567 struct sandbox_state;
568 
569 /**
570  * sandbox_spi_get_emul() - get an emulator for a SPI slave
571  *
572  * This provides a way to attach an emulated SPI device to a particular SPI
573  * slave, so that xfer() operations on the slave will be handled by the
574  * emulator. If a emulator already exists on that chip select it is returned.
575  * Otherwise one is created.
576  *
577  * @state:	Sandbox state
578  * @bus:	SPI bus requesting the emulator
579  * @slave:	SPI slave device requesting the emulator
580  * @emuip:	Returns pointer to emulator
581  * @return 0 if OK, -ve on error
582  */
583 int sandbox_spi_get_emul(struct sandbox_state *state,
584 			 struct udevice *bus, struct udevice *slave,
585 			 struct udevice **emulp);
586 
587 /**
588  * Claim the bus and prepare it for communication with a given slave.
589  *
590  * This must be called before doing any transfers with a SPI slave. It
591  * will enable and initialize any SPI hardware as necessary, and make
592  * sure that the SCK line is in the correct idle state. It is not
593  * allowed to claim the same bus for several slaves without releasing
594  * the bus in between.
595  *
596  * @dev:	The SPI slave device
597  *
598  * Returns: 0 if the bus was claimed successfully, or a negative value
599  * if it wasn't.
600  */
601 int dm_spi_claim_bus(struct udevice *dev);
602 
603 /**
604  * Release the SPI bus
605  *
606  * This must be called once for every call to dm_spi_claim_bus() after
607  * all transfers have finished. It may disable any SPI hardware as
608  * appropriate.
609  *
610  * @slave:	The SPI slave device
611  */
612 void dm_spi_release_bus(struct udevice *dev);
613 
614 /**
615  * SPI transfer
616  *
617  * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
618  * "bitlen" bits in the SPI MISO port.  That's just the way SPI works.
619  *
620  * The source of the outgoing bits is the "dout" parameter and the
621  * destination of the input bits is the "din" parameter.  Note that "dout"
622  * and "din" can point to the same memory location, in which case the
623  * input data overwrites the output data (since both are buffered by
624  * temporary variables, this is OK).
625  *
626  * dm_spi_xfer() interface:
627  * @dev:	The SPI slave device which will be sending/receiving the data.
628  * @bitlen:	How many bits to write and read.
629  * @dout:	Pointer to a string of bits to send out.  The bits are
630  *		held in a byte array and are sent MSB first.
631  * @din:	Pointer to a string of bits that will be filled in.
632  * @flags:	A bitwise combination of SPI_XFER_* flags.
633  *
634  * Returns: 0 on success, not 0 on failure
635  */
636 int dm_spi_xfer(struct udevice *dev, unsigned int bitlen,
637 		const void *dout, void *din, unsigned long flags);
638 
639 /* Access the operations for a SPI device */
640 #define spi_get_ops(dev)	((struct dm_spi_ops *)(dev)->driver->ops)
641 #define spi_emul_get_ops(dev)	((struct dm_spi_emul_ops *)(dev)->driver->ops)
642 #endif /* CONFIG_DM_SPI */
643 
644 #endif	/* _SPI_H_ */
645