2 * Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net>
3 * Copyright (C) 2009 - 2013 Heiko Schocher <hs@denx.de>
4 * Changes for multibus/multiadapter I2C support.
7 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
9 * SPDX-License-Identifier: GPL-2.0+
11 * The original I2C interface was
12 * (C) 2000 by Paolo Scaffardi (arsenio@tin.it)
13 * AIRVENT SAM s.p.a - RIMINI(ITALY)
14 * but has been changed substantially.
21 * For now there are essentially two parts to this file - driver model
22 * here at the top, and the older code below (with CONFIG_SYS_I2C being
23 * most recent). The plan is to migrate everything to driver model.
24 * The driver model structures and API are separate as they are different
25 * enough as to be incompatible for compilation purposes.
28 enum dm_i2c_chip_flags {
29 DM_I2C_CHIP_10BIT = 1 << 0, /* Use 10-bit addressing */
30 DM_I2C_CHIP_RD_ADDRESS = 1 << 1, /* Send address for each read byte */
31 DM_I2C_CHIP_WR_ADDRESS = 1 << 2, /* Send address for each write byte */
36 * struct dm_i2c_chip - information about an i2c chip
38 * An I2C chip is a device on the I2C bus. It sits at a particular address
39 * and normally supports 7-bit or 10-bit addressing.
41 * To obtain this structure, use dev_get_parent_platdata(dev) where dev is
42 * the chip to examine.
44 * @chip_addr: Chip address on bus
45 * @offset_len: Length of offset in bytes. A single byte offset can
46 * represent up to 256 bytes. A value larger than 1 may be
47 * needed for larger devices.
48 * @flags: Flags for this chip (dm_i2c_chip_flags)
49 * @emul: Emulator for this chip address (only used for emulation)
61 * struct dm_i2c_bus- information about an i2c bus
63 * An I2C bus contains 0 or more chips on it, each at its own address. The
64 * bus can operate at different speeds (measured in Hz, typically 100KHz
67 * To obtain this structure, use bus->uclass_priv where bus is the I2C
70 * @speed_hz: Bus speed in hertz (typically 100000)
77 * dm_i2c_read() - read bytes from an I2C chip
79 * To obtain an I2C device (called a 'chip') given the I2C bus address you
80 * can use i2c_get_chip(). To obtain a bus by bus number use
81 * uclass_get_device_by_seq(UCLASS_I2C, <bus number>).
83 * To set the address length of a devce use i2c_set_addr_len(). It
86 * @dev: Chip to read from
87 * @offset: Offset within chip to start reading
88 * @buffer: Place to put data
89 * @len: Number of bytes to read
91 * @return 0 on success, -ve on failure
93 int dm_i2c_read(struct udevice *dev, uint offset, uint8_t *buffer, int len);
96 * dm_i2c_write() - write bytes to an I2C chip
98 * See notes for dm_i2c_read() above.
100 * @dev: Chip to write to
101 * @offset: Offset within chip to start writing
102 * @buffer: Buffer containing data to write
103 * @len: Number of bytes to write
105 * @return 0 on success, -ve on failure
107 int dm_i2c_write(struct udevice *dev, uint offset, const uint8_t *buffer,
111 * dm_i2c_probe() - probe a particular chip address
113 * This can be useful to check for the existence of a chip on the bus.
114 * It is typically implemented by writing the chip address to the bus
115 * and checking that the chip replies with an ACK.
118 * @chip_addr: 7-bit address to probe (10-bit and others are not supported)
119 * @chip_flags: Flags for the probe (see enum dm_i2c_chip_flags)
120 * @devp: Returns the device found, or NULL if none
121 * @return 0 if a chip was found at that address, -ve if not
123 int dm_i2c_probe(struct udevice *bus, uint chip_addr, uint chip_flags,
124 struct udevice **devp);
127 * dm_i2c_set_bus_speed() - set the speed of a bus
129 * @bus: Bus to adjust
130 * @speed: Requested speed in Hz
131 * @return 0 if OK, -EINVAL for invalid values
133 int dm_i2c_set_bus_speed(struct udevice *bus, unsigned int speed);
136 * dm_i2c_get_bus_speed() - get the speed of a bus
139 * @return speed of selected I2C bus in Hz, -ve on error
141 int dm_i2c_get_bus_speed(struct udevice *bus);
144 * i2c_set_chip_flags() - set flags for a chip
146 * Typically addresses are 7 bits, but for 10-bit addresses you should set
147 * flags to DM_I2C_CHIP_10BIT. All accesses will then use 10-bit addressing.
149 * @dev: Chip to adjust
151 * @return 0 if OK, -EINVAL if value is unsupported, other -ve value on error
153 int i2c_set_chip_flags(struct udevice *dev, uint flags);
156 * i2c_get_chip_flags() - get flags for a chip
158 * @dev: Chip to check
159 * @flagsp: Place to put flags
160 * @return 0 if OK, other -ve value on error
162 int i2c_get_chip_flags(struct udevice *dev, uint *flagsp);
165 * i2c_set_offset_len() - set the offset length for a chip
167 * The offset used to access a chip may be up to 4 bytes long. Typically it
168 * is only 1 byte, which is enough for chips with 256 bytes of memory or
169 * registers. The default value is 1, but you can call this function to
172 * @offset_len: New offset length value (typically 1 or 2)
175 int i2c_set_chip_offset_len(struct udevice *dev, uint offset_len);
177 * i2c_deblock() - recover a bus that is in an unknown state
179 * See the deblock() method in 'struct dm_i2c_ops' for full information
181 * @bus: Bus to recover
182 * @return 0 if OK, -ve on error
184 int i2c_deblock(struct udevice *bus);
186 #ifdef CONFIG_DM_I2C_COMPAT
188 * i2c_probe() - Compatibility function for driver model
190 * Calls dm_i2c_probe() on the current bus
192 int i2c_probe(uint8_t chip_addr);
195 * i2c_read() - Compatibility function for driver model
197 * Calls dm_i2c_read() with the device corresponding to @chip_addr, and offset
198 * set to @addr. @alen must match the current setting for the device.
200 int i2c_read(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
204 * i2c_write() - Compatibility function for driver model
206 * Calls dm_i2c_write() with the device corresponding to @chip_addr, and offset
207 * set to @addr. @alen must match the current setting for the device.
209 int i2c_write(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
213 * i2c_get_bus_num_fdt() - Compatibility function for driver model
215 * @return the bus number associated with the given device tree node
217 int i2c_get_bus_num_fdt(int node);
220 * i2c_get_bus_num() - Compatibility function for driver model
222 * @return the 'current' bus number
224 unsigned int i2c_get_bus_num(void);
227 * i2c_set_bus_num() - Compatibility function for driver model
229 * Sets the 'current' bus
231 int i2c_set_bus_num(unsigned int bus);
233 static inline void I2C_SET_BUS(unsigned int bus)
235 i2c_set_bus_num(bus);
238 static inline unsigned int I2C_GET_BUS(void)
240 return i2c_get_bus_num();
244 * i2c_init() - Compatibility function for driver model
246 * This function does nothing.
248 void i2c_init(int speed, int slaveaddr);
251 * board_i2c_init() - Compatibility function for driver model
253 * @param blob Device tree blbo
254 * @return the number of I2C bus
256 void board_i2c_init(const void *blob);
261 * Not all of these flags are implemented in the U-Boot API
263 enum dm_i2c_msg_flags {
264 I2C_M_TEN = 0x0010, /* ten-bit chip address */
265 I2C_M_RD = 0x0001, /* read data, from slave to master */
266 I2C_M_STOP = 0x8000, /* send stop after this message */
267 I2C_M_NOSTART = 0x4000, /* no start before this message */
268 I2C_M_REV_DIR_ADDR = 0x2000, /* invert polarity of R/W bit */
269 I2C_M_IGNORE_NAK = 0x1000, /* continue after NAK */
270 I2C_M_NO_RD_ACK = 0x0800, /* skip the Ack bit on reads */
271 I2C_M_RECV_LEN = 0x0400, /* length is first received byte */
275 * struct i2c_msg - an I2C message
277 * @addr: Slave address
278 * @flags: Flags (see enum dm_i2c_msg_flags)
279 * @len: Length of buffer in bytes, may be 0 for a probe
280 * @buf: Buffer to send/receive, or NULL if no data
290 * struct i2c_msg_list - a list of I2C messages
292 * This is called i2c_rdwr_ioctl_data in Linux but the name does not seem
293 * appropriate in U-Boot.
295 * @msg: Pointer to i2c_msg array
296 * @nmsgs: Number of elements in the array
298 struct i2c_msg_list {
299 struct i2c_msg *msgs;
304 * struct dm_i2c_ops - driver operations for I2C uclass
306 * Drivers should support these operations unless otherwise noted. These
307 * operations are intended to be used by uclass code, not directly from
312 * xfer() - transfer a list of I2C messages
314 * @bus: Bus to read from
315 * @msg: List of messages to transfer
316 * @nmsgs: Number of messages in the list
317 * @return 0 if OK, -EREMOTEIO if the slave did not ACK a byte,
318 * -ECOMM if the speed cannot be supported, -EPROTO if the chip
319 * flags cannot be supported, other -ve value on some other error
321 int (*xfer)(struct udevice *bus, struct i2c_msg *msg, int nmsgs);
324 * probe_chip() - probe for the presense of a chip address
326 * This function is optional. If omitted, the uclass will send a zero
327 * length message instead.
330 * @chip_addr: Chip address to probe
331 * @chip_flags: Probe flags (enum dm_i2c_chip_flags)
332 * @return 0 if chip was found, -EREMOTEIO if not, -ENOSYS to fall back
333 * to default probem other -ve value on error
335 int (*probe_chip)(struct udevice *bus, uint chip_addr, uint chip_flags);
338 * set_bus_speed() - set the speed of a bus (optional)
340 * The bus speed value will be updated by the uclass if this function
341 * does not return an error. This method is optional - if it is not
342 * provided then the driver can read the speed from
343 * bus->uclass_priv->speed_hz
345 * @bus: Bus to adjust
346 * @speed: Requested speed in Hz
347 * @return 0 if OK, -EINVAL for invalid values
349 int (*set_bus_speed)(struct udevice *bus, unsigned int speed);
352 * get_bus_speed() - get the speed of a bus (optional)
354 * Normally this can be provided by the uclass, but if you want your
355 * driver to check the bus speed by looking at the hardware, you can
356 * implement that here. This method is optional. This method would
357 * normally be expected to return bus->uclass_priv->speed_hz.
360 * @return speed of selected I2C bus in Hz, -ve on error
362 int (*get_bus_speed)(struct udevice *bus);
365 * set_flags() - set the flags for a chip (optional)
367 * This is generally implemented by the uclass, but drivers can
368 * check the value to ensure that unsupported options are not used.
369 * This method is optional. If provided, this method will always be
370 * called when the flags change.
372 * @dev: Chip to adjust
373 * @flags: New flags value
374 * @return 0 if OK, -EINVAL if value is unsupported
376 int (*set_flags)(struct udevice *dev, uint flags);
379 * deblock() - recover a bus that is in an unknown state
381 * I2C is a synchronous protocol and resets of the processor in the
382 * middle of an access can block the I2C Bus until a powerdown of
383 * the full unit is done. This is because slaves can be stuck
384 * waiting for addition bus transitions for a transaction that will
385 * never complete. Resetting the I2C master does not help. The only
386 * way is to force the bus through a series of transitions to make
387 * sure that all slaves are done with the transaction. This method
388 * performs this 'deblocking' if support by the driver.
390 * This method is optional.
392 int (*deblock)(struct udevice *bus);
395 #define i2c_get_ops(dev) ((struct dm_i2c_ops *)(dev)->driver->ops)
398 * i2c_get_chip() - get a device to use to access a chip on a bus
400 * This returns the device for the given chip address. The device can then
401 * be used with calls to i2c_read(), i2c_write(), i2c_probe(), etc.
403 * @bus: Bus to examine
404 * @chip_addr: Chip address for the new device
405 * @offset_len: Length of a register offset in bytes (normally 1)
406 * @devp: Returns pointer to new device if found or -ENODEV if not
409 int i2c_get_chip(struct udevice *bus, uint chip_addr, uint offset_len,
410 struct udevice **devp);
413 * i2c_get_chip() - get a device to use to access a chip on a bus number
415 * This returns the device for the given chip address on a particular bus
418 * @busnum: Bus number to examine
419 * @chip_addr: Chip address for the new device
420 * @offset_len: Length of a register offset in bytes (normally 1)
421 * @devp: Returns pointer to new device if found or -ENODEV if not
424 int i2c_get_chip_for_busnum(int busnum, int chip_addr, uint offset_len,
425 struct udevice **devp);
428 * i2c_chip_ofdata_to_platdata() - Decode standard I2C platform data
430 * This decodes the chip address from a device tree node and puts it into
431 * its dm_i2c_chip structure. This should be called in your driver's
432 * ofdata_to_platdata() method.
434 * @blob: Device tree blob
435 * @node: Node offset to read from
436 * @spi: Place to put the decoded information
438 int i2c_chip_ofdata_to_platdata(const void *blob, int node,
439 struct dm_i2c_chip *chip);
441 #ifndef CONFIG_DM_I2C
444 * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
446 * The implementation MUST NOT use static or global variables if the
447 * I2C routines are used to read SDRAM configuration information
448 * because this is done before the memories are initialized. Limited
449 * use of stack-based variables are OK (the initial stack size is
452 * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
456 * Configuration items.
458 #define I2C_RXTX_LEN 128 /* maximum tx/rx buffer length */
460 #if !defined(CONFIG_SYS_I2C_MAX_HOPS)
461 /* no muxes used bus = i2c adapters */
462 #define CONFIG_SYS_I2C_DIRECT_BUS 1
463 #define CONFIG_SYS_I2C_MAX_HOPS 0
464 #define CONFIG_SYS_NUM_I2C_BUSES ll_entry_count(struct i2c_adapter, i2c)
466 /* we use i2c muxes */
467 #undef CONFIG_SYS_I2C_DIRECT_BUS
470 /* define the I2C bus number for RTC and DTT if not already done */
471 #if !defined(CONFIG_SYS_RTC_BUS_NUM)
472 #define CONFIG_SYS_RTC_BUS_NUM 0
474 #if !defined(CONFIG_SYS_DTT_BUS_NUM)
475 #define CONFIG_SYS_DTT_BUS_NUM 0
477 #if !defined(CONFIG_SYS_SPD_BUS_NUM)
478 #define CONFIG_SYS_SPD_BUS_NUM 0
482 void (*init)(struct i2c_adapter *adap, int speed,
484 int (*probe)(struct i2c_adapter *adap, uint8_t chip);
485 int (*read)(struct i2c_adapter *adap, uint8_t chip,
486 uint addr, int alen, uint8_t *buffer,
488 int (*write)(struct i2c_adapter *adap, uint8_t chip,
489 uint addr, int alen, uint8_t *buffer,
491 uint (*set_bus_speed)(struct i2c_adapter *adap,
501 #define U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
502 _set_speed, _speed, _slaveaddr, _hwadapnr, _name) \
508 .set_bus_speed = _set_speed, \
510 .slaveaddr = _slaveaddr, \
512 .hwadapnr = _hwadapnr, \
516 #define U_BOOT_I2C_ADAP_COMPLETE(_name, _init, _probe, _read, _write, \
517 _set_speed, _speed, _slaveaddr, _hwadapnr) \
518 ll_entry_declare(struct i2c_adapter, _name, i2c) = \
519 U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
520 _set_speed, _speed, _slaveaddr, _hwadapnr, _name);
522 struct i2c_adapter *i2c_get_adapter(int index);
524 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
530 struct i2c_next_hop {
536 struct i2c_bus_hose {
538 struct i2c_next_hop next_hop[CONFIG_SYS_I2C_MAX_HOPS];
540 #define I2C_NULL_HOP {{-1, ""}, 0, 0}
541 extern struct i2c_bus_hose i2c_bus[];
543 #define I2C_ADAPTER(bus) i2c_bus[bus].adapter
545 #define I2C_ADAPTER(bus) bus
547 #define I2C_BUS gd->cur_i2c_bus
549 #define I2C_ADAP_NR(bus) i2c_get_adapter(I2C_ADAPTER(bus))
550 #define I2C_ADAP I2C_ADAP_NR(gd->cur_i2c_bus)
551 #define I2C_ADAP_HWNR (I2C_ADAP->hwadapnr)
553 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
554 #define I2C_MUX_PCA9540_ID 1
555 #define I2C_MUX_PCA9540 {I2C_MUX_PCA9540_ID, "PCA9540B"}
556 #define I2C_MUX_PCA9542_ID 2
557 #define I2C_MUX_PCA9542 {I2C_MUX_PCA9542_ID, "PCA9542A"}
558 #define I2C_MUX_PCA9544_ID 3
559 #define I2C_MUX_PCA9544 {I2C_MUX_PCA9544_ID, "PCA9544A"}
560 #define I2C_MUX_PCA9547_ID 4
561 #define I2C_MUX_PCA9547 {I2C_MUX_PCA9547_ID, "PCA9547A"}
562 #define I2C_MUX_PCA9548_ID 5
563 #define I2C_MUX_PCA9548 {I2C_MUX_PCA9548_ID, "PCA9548"}
566 #ifndef I2C_SOFT_DECLARATIONS
567 # if defined(CONFIG_MPC8260)
568 # define I2C_SOFT_DECLARATIONS volatile ioport_t *iop = ioport_addr((immap_t *)CONFIG_SYS_IMMR, I2C_PORT);
569 # elif defined(CONFIG_8xx)
570 # define I2C_SOFT_DECLARATIONS volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
572 # elif (defined(CONFIG_AT91RM9200) || \
573 defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9261) || \
574 defined(CONFIG_AT91SAM9263))
575 # define I2C_SOFT_DECLARATIONS at91_pio_t *pio = (at91_pio_t *) ATMEL_BASE_PIOA;
577 # define I2C_SOFT_DECLARATIONS
582 /* Set default value for the I2C bus speed on 8xx. In the
583 * future, we'll define these in all 8xx board config files.
585 #ifndef CONFIG_SYS_I2C_SPEED
586 #define CONFIG_SYS_I2C_SPEED 50000
591 * Many boards/controllers/drivers don't support an I2C slave interface so
592 * provide a default slave address for them for use in common code. A real
593 * value for CONFIG_SYS_I2C_SLAVE should be defined for any board which does
594 * support a slave interface.
596 #ifndef CONFIG_SYS_I2C_SLAVE
597 #define CONFIG_SYS_I2C_SLAVE 0xfe
601 * Initialization, must be called once on start up, may be called
602 * repeatedly to change the speed and slave addresses.
604 void i2c_init(int speed, int slaveaddr);
605 void i2c_init_board(void);
606 #ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
607 void i2c_board_late_init(void);
610 #ifdef CONFIG_SYS_I2C
614 * Returns index of currently active I2C bus. Zero-based.
616 unsigned int i2c_get_bus_num(void);
621 * Change the active I2C bus. Subsequent read/write calls will
624 * bus - bus index, zero based
626 * Returns: 0 on success, not 0 on failure
629 int i2c_set_bus_num(unsigned int bus);
634 * Initializes all I2C adapters in the system. All i2c_adap structures must
635 * be initialized beforehead with function pointers and data, including
636 * speed and slaveaddr. Returns 0 on success, non-0 on failure.
638 void i2c_init_all(void);
641 * Probe the given I2C chip address. Returns 0 if a chip responded,
644 int i2c_probe(uint8_t chip);
647 * Read/Write interface:
648 * chip: I2C chip address, range 0..127
649 * addr: Memory (register) address within the chip
650 * alen: Number of bytes to use for addr (typically 1, 2 for larger
651 * memories, 0 for register type devices with only one
653 * buffer: Where to read/write the data
654 * len: How many bytes to read/write
656 * Returns: 0 on success, not 0 on failure
658 int i2c_read(uint8_t chip, unsigned int addr, int alen,
659 uint8_t *buffer, int len);
661 int i2c_write(uint8_t chip, unsigned int addr, int alen,
662 uint8_t *buffer, int len);
665 * Utility routines to read/write registers.
667 uint8_t i2c_reg_read(uint8_t addr, uint8_t reg);
669 void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val);
674 * Change the speed of the active I2C bus
676 * speed - bus speed in Hz
678 * Returns: new bus speed
681 unsigned int i2c_set_bus_speed(unsigned int speed);
686 * Returns speed of currently active I2C bus in Hz
689 unsigned int i2c_get_bus_speed(void);
694 * Adjusts I2C pointers after U-Boot is relocated to DRAM
696 void i2c_reloc_fixup(void);
697 #if defined(CONFIG_SYS_I2C_SOFT)
698 void i2c_soft_init(void);
699 void i2c_soft_active(void);
700 void i2c_soft_tristate(void);
701 int i2c_soft_read(void);
702 void i2c_soft_sda(int bit);
703 void i2c_soft_scl(int bit);
704 void i2c_soft_delay(void);
709 * Probe the given I2C chip address. Returns 0 if a chip responded,
712 int i2c_probe(uchar chip);
715 * Read/Write interface:
716 * chip: I2C chip address, range 0..127
717 * addr: Memory (register) address within the chip
718 * alen: Number of bytes to use for addr (typically 1, 2 for larger
719 * memories, 0 for register type devices with only one
721 * buffer: Where to read/write the data
722 * len: How many bytes to read/write
724 * Returns: 0 on success, not 0 on failure
726 int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len);
727 int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len);
730 * Utility routines to read/write registers.
732 static inline u8 i2c_reg_read(u8 addr, u8 reg)
737 /* MPC8xx needs this. Maybe one day we can get rid of it. */
738 i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
742 printf("%s: addr=0x%02x, reg=0x%02x\n", __func__, addr, reg);
745 i2c_read(addr, reg, 1, &buf, 1);
750 static inline void i2c_reg_write(u8 addr, u8 reg, u8 val)
753 /* MPC8xx needs this. Maybe one day we can get rid of it. */
754 i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
758 printf("%s: addr=0x%02x, reg=0x%02x, val=0x%02x\n",
759 __func__, addr, reg, val);
762 i2c_write(addr, reg, 1, &val, 1);
766 * Functions for setting the current I2C bus and its speed
772 * Change the active I2C bus. Subsequent read/write calls will
775 * bus - bus index, zero based
777 * Returns: 0 on success, not 0 on failure
780 int i2c_set_bus_num(unsigned int bus);
785 * Returns index of currently active I2C bus. Zero-based.
788 unsigned int i2c_get_bus_num(void);
793 * Change the speed of the active I2C bus
795 * speed - bus speed in Hz
797 * Returns: 0 on success, not 0 on failure
800 int i2c_set_bus_speed(unsigned int);
805 * Returns speed of currently active I2C bus in Hz
808 unsigned int i2c_get_bus_speed(void);
809 #endif /* CONFIG_SYS_I2C */
812 * only for backwardcompatibility, should go away if we switched
813 * completely to new multibus support.
815 #if defined(CONFIG_SYS_I2C) || defined(CONFIG_I2C_MULTI_BUS)
816 # if !defined(CONFIG_SYS_MAX_I2C_BUS)
817 # define CONFIG_SYS_MAX_I2C_BUS 2
819 # define I2C_MULTI_BUS 1
821 # define CONFIG_SYS_MAX_I2C_BUS 1
822 # define I2C_MULTI_BUS 0
825 /* NOTE: These two functions MUST be always_inline to avoid code growth! */
826 static inline unsigned int I2C_GET_BUS(void) __attribute__((always_inline));
827 static inline unsigned int I2C_GET_BUS(void)
829 return I2C_MULTI_BUS ? i2c_get_bus_num() : 0;
832 static inline void I2C_SET_BUS(unsigned int bus) __attribute__((always_inline));
833 static inline void I2C_SET_BUS(unsigned int bus)
836 i2c_set_bus_num(bus);
839 /* Multi I2C definitions */
841 I2C_0, I2C_1, I2C_2, I2C_3, I2C_4, I2C_5, I2C_6, I2C_7,
842 I2C_8, I2C_9, I2C_10,
845 /* Multi I2C busses handling */
846 #ifdef CONFIG_SOFT_I2C_MULTI_BUS
847 extern int get_multi_scl_pin(void);
848 extern int get_multi_sda_pin(void);
849 extern int multi_i2c_init(void);
853 * Get FDT values for i2c bus.
855 * @param blob Device tree blbo
856 * @return the number of I2C bus
858 void board_i2c_init(const void *blob);
861 * Find the I2C bus number by given a FDT I2C node.
863 * @param blob Device tree blbo
864 * @param node FDT I2C node to find
865 * @return the number of I2C bus (zero based), or -1 on error
867 int i2c_get_bus_num_fdt(int node);
870 * Reset the I2C bus represented by the given a FDT I2C node.
872 * @param blob Device tree blbo
873 * @param node FDT I2C node to find
874 * @return 0 if port was reset, -1 if not found
876 int i2c_reset_port_fdt(const void *blob, int node);
878 #endif /* !CONFIG_DM_I2C */