+Masahiro On Nov 24, 2014 11:58 AM, "Simon Glass" sjg@chromium.org wrote:
The uclass implements the same operations as the current I2C framework but makes some changes to make it fit driver model better:
- Remove the chip address from API calls
- Remove the address length from API calls
- Remove concept of 'current' I2C bus
- Drop all existing init functions
Signed-off-by: Simon Glass sjg@chromium.org
Changes in v3:
- Change uclass <=> driver API to use a message list
- Correct bogus address len code (was confused with chip address length)
- Drop extra call to i2c_bind_driver() in i2c_probe()
- Add a helper to query chip flags
- Add support for reading a byte at a time with an address for each byte
Changes in v2:
- Fix cihp typo
- Implement generic I2C devices to allow 'i2c probe' on unknown devices
- Return the probed device from i2c_probe()
- Set the bus speed after the bus is probed
- Add some debugging for generic I2C device binding
- Add a 'deblock' method to recover an I2C bus stuck in mid-transaction
- Add a helper function to find a chip on a particular bus number
drivers/i2c/Makefile | 1 + drivers/i2c/i2c-uclass.c | 411 +++++++++++++++++++++++++++++++++++++++++++++ include/config_fallbacks.h | 6 + include/dm/uclass-id.h | 2 + include/i2c.h | 348 ++++++++++++++++++++++++++++++++++++++ 5 files changed, 768 insertions(+) create mode 100644 drivers/i2c/i2c-uclass.c
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index dae3d71..063e097 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -4,6 +4,7 @@ # # SPDX-License-Identifier: GPL-2.0+ # +obj-$(CONFIG_DM_I2C) += i2c-uclass.o
obj-$(CONFIG_SYS_I2C_ADI) += adi_i2c.o obj-$(CONFIG_I2C_MV) += mv_i2c.o diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c new file mode 100644 index 0000000..4063a80 --- /dev/null +++ b/drivers/i2c/i2c-uclass.c @@ -0,0 +1,411 @@ +/*
- Copyright (c) 2014 Google, Inc
- SPDX-License-Identifier: GPL-2.0+
- */
+#include <common.h> +#include <dm.h> +#include <errno.h> +#include <fdtdec.h> +#include <i2c.h> +#include <malloc.h> +#include <dm/device-internal.h> +#include <dm/lists.h> +#include <dm/root.h>
+DECLARE_GLOBAL_DATA_PTR;
+static bool i2c_setup_offset(struct dm_i2c_chip *chip, uint offset,
uint8_t offset_buf[], struct i2c_msg *msg)+{
if (!chip->offset_len)return false;msg->addr = chip->chip_addr;msg->flags = chip->flags;msg->len = chip->offset_len;msg->buf = offset_buf;offset_buf[0] = offset;offset_buf[1] = offset >> 8;offset_buf[2] = offset >> 16;offset_buf[3] = offset >> 24;return true;+}
+static int i2c_read_bytewise(struct udevice *dev, uint offset,
const uint8_t *buffer, int len)+{
struct dm_i2c_chip *chip = dev_get_parentdata(dev);struct udevice *bus = dev_get_parent(dev);struct dm_i2c_ops *ops = i2c_get_ops(bus);struct i2c_msg msg[1];uint8_t buf[5];int ret;int i;for (i = 0; i < len; i++) {i2c_setup_offset(chip, offset, buf, msg);msg->len++;buf[chip->offset_len] = buffer[i];ret = ops->xfer(bus, msg, 1);if (ret)return ret;}return 0;+}
+int i2c_read(struct udevice *dev, uint offset, uint8_t *buffer, int len) +{
struct dm_i2c_chip *chip = dev_get_parentdata(dev);struct udevice *bus = dev_get_parent(dev);struct dm_i2c_ops *ops = i2c_get_ops(bus);struct i2c_msg msg[2], *ptr;uint8_t offset_buf[4];int msg_count;if (!ops->xfer)return -ENOSYS;if (chip->flags & DM_I2C_CHIP_RE_ADDRESS)return i2c_read_bytewise(dev, offset, buffer, len);ptr = msg;if (i2c_setup_offset(chip, offset, offset_buf, ptr))ptr++;if (len) {ptr->addr = chip->chip_addr;ptr->flags = chip->flags | I2C_M_RD;ptr->len = len;ptr->buf = buffer;ptr++;}msg_count = ptr - msg;return ops->xfer(bus, msg, msg_count);+}
+int i2c_write(struct udevice *dev, uint offset, const uint8_t *buffer, int len) +{
struct dm_i2c_chip *chip = dev_get_parentdata(dev);struct udevice *bus = dev_get_parent(dev);struct dm_i2c_ops *ops = i2c_get_ops(bus);struct i2c_msg msg[1];if (!ops->xfer)return -ENOSYS;/** The simple approach would be to send two messages here: one to* set the offset and one to write the bytes. However some drivers* will not be expecting this, and some chips won't like how the* driver presents this on the I2C bus.** The API does not support separate offset and data. We couldextend
* it with a flag indicating that there is data in the next message* that needs to be processed in the same transaction. We could* instead add an additional buffer to each message. For now,handle
* this in the uclass since it isn't clear what the impact ondrivers
* would be with this extra complication. Unfortunately this means* copying the message.** Use the stack for small messages, malloc() for larger ones. We* need to allow space for the offset (up to 4 bytes) and themessage
* itself.*/if (len < 64) {uint8_t buf[4 + len];i2c_setup_offset(chip, offset, buf, msg);msg->len += len;memcpy(buf + chip->offset_len, buffer, len);return ops->xfer(bus, msg, 1);} else {uint8_t *buf;int ret;buf = malloc(4 + len);if (!buf)return -ENOMEM;i2c_setup_offset(chip, offset, buf, msg);msg->len += len;memcpy(buf + chip->offset_len, buffer, len);ret = ops->xfer(bus, msg, 1);free(buf);return ret;}+}
+static int i2c_probe_chip(struct udevice *bus, uint chip_addr) +{
struct dm_i2c_ops *ops = i2c_get_ops(bus);struct i2c_msg msg[1];uint8_t ch = 0;if (!ops->xfer)return -ENOSYS;msg->addr = chip_addr;msg->flags = 0;msg->len = 1;msg->buf = &ch;return ops->xfer(bus, msg, 1);+}
+static int i2c_bind_driver(struct udevice *bus, uint chip_addr,
struct udevice **devp)+{
struct dm_i2c_chip *chip;char name[30], *str;struct udevice *dev;int ret;snprintf(name, sizeof(name), "generic_%x", chip_addr);str = strdup(name);ret = device_bind_driver(bus, "i2c_generic_drv", str, &dev);debug("%s: device_bind_driver: ret=%d\n", __func__, ret);if (ret)goto err_bind;/* Tell the device what we know about it */chip = calloc(1, sizeof(struct dm_i2c_chip));if (!chip) {ret = -ENOMEM;goto err_mem;}chip->chip_addr = chip_addr;chip->offset_len = 1; /* we assume */ret = device_probe_child(dev, chip);debug("%s: device_probe_child: ret=%d\n", __func__, ret);free(chip);if (ret)goto err_probe;*devp = dev;return 0;+err_probe: +err_mem:
device_unbind(dev);+err_bind:
free(str);return ret;+}
+int i2c_get_chip(struct udevice *bus, uint chip_addr, struct udevice **devp) +{
struct udevice *dev;debug("%s: Searching bus '%s' for address %02x: ", __func__,bus->name, chip_addr);for (device_find_first_child(bus, &dev); dev;device_find_next_child(&dev)) {struct dm_i2c_chip store;struct dm_i2c_chip *chip = dev_get_parentdata(dev);int ret;if (!chip) {chip = &store;i2c_chip_ofdata_to_platdata(gd->fdt_blob,dev->of_offset, chip);}if (chip->chip_addr == chip_addr) {ret = device_probe(dev);debug("found, ret=%d\n", ret);if (ret)return ret;*devp = dev;return 0;}}debug("not found\n");return i2c_bind_driver(bus, chip_addr, devp);+}
+int i2c_get_chip_for_busnum(int busnum, int chip_addr, struct udevice **devp) +{
struct udevice *bus;int ret;ret = uclass_get_device_by_seq(UCLASS_I2C, busnum, &bus);if (ret) {debug("Cannot find I2C bus %d\n", busnum);return ret;}ret = i2c_get_chip(bus, chip_addr, devp);if (ret) {debug("Cannot find I2C chip %02x on bus %d\n", chip_addr,busnum);return ret;}return 0;+}
+int i2c_probe(struct udevice *bus, uint chip_addr, struct udevice **devp) +{
int ret;*devp = NULL;/* First probe that chip */ret = i2c_probe_chip(bus, chip_addr);debug("%s: bus='%s', address %02x, ret=%d\n", __func__, bus->name,chip_addr, ret);if (ret)return ret;/* The chip was found, see if we have a driver, and probe it */ret = i2c_get_chip(bus, chip_addr, devp);debug("%s: i2c_get_chip: ret=%d\n", __func__, ret);return ret;+}
+int i2c_set_bus_speed(struct udevice *bus, unsigned int speed) +{
struct dm_i2c_ops *ops = i2c_get_ops(bus);struct dm_i2c_bus *i2c = bus->uclass_priv;int ret;if (ops->set_bus_speed) {ret = ops->set_bus_speed(bus, speed);if (ret)return ret;}i2c->speed_hz = speed;return 0;+}
+/*
- i2c_get_bus_speed:
- Returns speed of selected I2C bus in Hz
- */
+int i2c_get_bus_speed(struct udevice *bus) +{
struct dm_i2c_ops *ops = i2c_get_ops(bus);struct dm_i2c_bus *i2c = bus->uclass_priv;if (!ops->set_bus_speed)return i2c->speed_hz;return ops->get_bus_speed(bus);+}
+int i2c_set_chip_flags(struct udevice *dev, uint flags) +{
struct udevice *bus = dev->parent;struct dm_i2c_chip *chip = dev_get_parentdata(dev);struct dm_i2c_ops *ops = i2c_get_ops(bus);int ret;if (ops->set_flags) {ret = ops->set_flags(dev, flags);if (ret)return ret;}chip->flags = flags;return 0;+}
+int i2c_get_chip_flags(struct udevice *dev, uint *flagsp) +{
struct dm_i2c_chip *chip = dev_get_parentdata(dev);*flagsp = chip->flags;return 0;+}
+int i2c_set_chip_offset_len(struct udevice *dev, uint offset_len) +{
struct udevice *bus = dev->parent;struct dm_i2c_chip *chip = dev_get_parentdata(dev);struct dm_i2c_ops *ops = i2c_get_ops(bus);int ret;if (offset_len > 3)return -EINVAL;if (ops->set_offset_len) {ret = ops->set_offset_len(dev, offset_len);if (ret)return ret;}chip->offset_len = offset_len;return 0;+}
+int i2c_deblock(struct udevice *bus) +{
struct dm_i2c_ops *ops = i2c_get_ops(bus);/** We could implement a software deblocking here if we could get* access to the GPIOs used by I2C, and switch them to GPIO mode* and then back to I2C. This is somewhat beyond our powers in* driver model at present, so for now just fail.** See https://patchwork.ozlabs.org/patch/399040/*/if (!ops->deblock)return -ENOSYS;return ops->deblock(bus);+}
+int i2c_chip_ofdata_to_platdata(const void *blob, int node,
struct dm_i2c_chip *chip)+{
chip->offset_len = 1; /* default */chip->flags = 0;chip->chip_addr = fdtdec_get_int(gd->fdt_blob, node, "reg", -1);if (chip->chip_addr == -1) {debug("%s: I2C Node '%s' has no 'reg' property\n",__func__,
fdt_get_name(blob, node, NULL));return -EINVAL;}return 0;+}
+static int i2c_post_probe(struct udevice *dev) +{
struct dm_i2c_bus *i2c = dev->uclass_priv;i2c->speed_hz = fdtdec_get_int(gd->fdt_blob, dev->of_offset,"clock-frequency", 100000);return i2c_set_bus_speed(dev, i2c->speed_hz);+}
+int i2c_post_bind(struct udevice *dev) +{
/* Scan the bus for devices */return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);+}
+UCLASS_DRIVER(i2c) = {
.id = UCLASS_I2C,.name = "i2c",.per_device_auto_alloc_size = sizeof(struct dm_i2c_bus),.post_bind = i2c_post_bind,.post_probe = i2c_post_probe,+};
+UCLASS_DRIVER(i2c_generic) = {
.id = UCLASS_I2C_GENERIC,.name = "i2c_generic",+};
+U_BOOT_DRIVER(i2c_generic_drv) = {
.name = "i2c_generic_drv",.id = UCLASS_I2C_GENERIC,+}; diff --git a/include/config_fallbacks.h b/include/config_fallbacks.h index 7d8daa2..91a0a43 100644 --- a/include/config_fallbacks.h +++ b/include/config_fallbacks.h @@ -87,4 +87,10 @@ #undef CONFIG_IMAGE_FORMAT_LEGACY #endif
+#ifdef CONFIG_DM_I2C +# ifdef CONFIG_SYS_I2C +# error "Cannot define CONFIG_SYS_I2C when CONFIG_DM_I2C is used" +# endif +#endif
#endif /* __CONFIG_FALLBACKS_H */ diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index a8944c9..43514bc 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -28,6 +28,8 @@ enum uclass_id { UCLASS_SPI_GENERIC, /* Generic SPI flash target */ UCLASS_SPI_FLASH, /* SPI flash */ UCLASS_CROS_EC, /* Chrome OS EC */
UCLASS_I2C, /* I2C bus */UCLASS_I2C_GENERIC, /* Generic I2C device */ UCLASS_COUNT, UCLASS_INVALID = -1,diff --git a/include/i2c.h b/include/i2c.h index 1b4078e..dd8fd2e 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -18,6 +18,351 @@ #define _I2C_H_
/*
- For now there are essentially two parts to this file - driver model
- here at the top, and the older code below (with CONFIG_SYS_I2C being
- most recent). The plan is to migrate everything to driver model.
- The driver model structures and API are separate as they are different
- enough as to be incompatible for compilation purposes.
- */
+#ifdef CONFIG_DM_I2C
+enum dm_i2c_chip_flags {
DM_I2C_CHIP_10BIT = 1 << 0, /* Use 10-bit addressing */DM_I2C_CHIP_RE_ADDRESS = 1 << 1, /* Send address for every byte */+};
+/**
- struct dm_i2c_chip - information about an i2c chip
- An I2C chip is a device on the I2C bus. It sits at a particular address
- and normally supports 7-bit or 10-bit addressing.
- To obtain this structure, use dev_get_parentdata(dev) where dev is the
- chip to examine.
- @chip_addr: Chip address on bus
- @offset_len: Length of offset in bytes. A single byte offset can
represent up to 256 bytes. A value larger than 1 may be
needed for larger devices.
- @flags: Flags for this chip (dm_i2c_chip_flags)
- @emul: Emulator for this chip address (only used for emulation)
- */
+struct dm_i2c_chip {
uint chip_addr;uint offset_len;uint flags;+#ifdef CONFIG_SANDBOX
struct udevice *emul;+#endif +};
+/**
- struct dm_i2c_bus- information about an i2c bus
- An I2C bus contains 0 or more chips on it, each at its own address. The
- bus can operate at different speeds (measured in Hz, typically 100KHz
- or 400KHz).
- To obtain this structure, use bus->uclass_priv where bus is the I2C
- bus udevice.
- @speed_hz: Bus speed in hertz (typically 100000)
- */
+struct dm_i2c_bus {
int speed_hz;+};
+/**
- i2c_read() - read bytes from an I2C chip
- To obtain an I2C device (called a 'chip') given the I2C bus address you
- can use i2c_get_chip(). To obtain a bus by bus number use
- uclass_get_device_by_seq(UCLASS_I2C, <bus number>).
- To set the address length of a devce use i2c_set_addr_len(). It
- defaults to 1.
- @dev: Chip to read from
- @offset: Offset within chip to start reading
- @buffer: Place to put data
- @len: Number of bytes to read
- @return 0 on success, -ve on failure
- */
+int i2c_read(struct udevice *dev, uint offset, uint8_t *buffer,
int len);+/**
- i2c_write() - write bytes to an I2C chip
- See notes for i2c_read() above.
- @dev: Chip to write to
- @offset: Offset within chip to start writing
- @buffer: Buffer containing data to write
- @len: Number of bytes to write
- @return 0 on success, -ve on failure
- */
+int i2c_write(struct udevice *dev, uint offset, const uint8_t *buffer,
int len);+/**
- i2c_probe() - probe a particular chip address
- This can be useful to check for the existence of a chip on the bus.
- It is typically implemented by writing the chip address to the bus
- and checking that the chip replies with an ACK.
- @bus: Bus to probe
- @chip_addr: 7-bit address to probe (10-bit and others are not
supported)
- @devp: Returns the device found, or NULL if none
- @return 0 if a chip was found at that address, -ve if not
- */
+int i2c_probe(struct udevice *bus, uint chip_addr, struct udevice **devp);
+/**
- i2c_set_bus_speed() - set the speed of a bus
- @bus: Bus to adjust
- @speed: Requested speed in Hz
- @return 0 if OK, -EINVAL for invalid values
- */
+int i2c_set_bus_speed(struct udevice *bus, unsigned int speed);
+/**
- i2c_get_bus_speed() - get the speed of a bus
- @bus: Bus to check
- @return speed of selected I2C bus in Hz, -ve on error
- */
+int i2c_get_bus_speed(struct udevice *bus);
+/**
- i2c_set_chip_flags() - set flags for a chip
- Typically addresses are 7 bits, but for 10-bit addresses you should set
- flags to DM_I2C_CHIP_10BIT. All accesses will then use 10-bit
addressing.
- @dev: Chip to adjust
- @flags: New flags
- @return 0 if OK, -EINVAL if value is unsupported, other -ve value on
error
- */
+int i2c_set_chip_flags(struct udevice *dev, uint flags);
+/**
- i2c_get_chip_flags() - get flags for a chip
- @dev: Chip to check
- @flagsp: Place to put flags
- @return 0 if OK, other -ve value on error
- */
+int i2c_get_chip_flags(struct udevice *dev, uint *flagsp);
+/**
- i2c_set_offset_len() - set the offset length for a chip
- The offset used to access a chip may be up to 4 bytes long. Typically
it
- is only 1 byte, which is enough for chips with 256 bytes of memory or
- registers. The default value is 1, but you can call this function to
- change it.
- @offset_len: New offset length value (typically 1 or 2)
- */
+int i2c_set_chip_offset_len(struct udevice *dev, uint offset_len); +/**
- i2c_deblock() - recover a bus that is in an unknown state
- See the deblock() method in 'struct dm_i2c_ops' for full information
- @bus: Bus to recover
- @return 0 if OK, -ve on error
- */
+int i2c_deblock(struct udevice *bus);
+/*
- Not all of these flags are implemented in the U-Boot API
- */
+enum dm_i2c_msg_flags {
I2C_M_TEN = 0x0010, /* ten-bit chip address */I2C_M_RD = 0x0001, /* read data, from slave tomaster */
I2C_M_STOP = 0x8000, /* send stop after this message*/
I2C_M_NOSTART = 0x4000, /* no start before this message*/
I2C_M_REV_DIR_ADDR = 0x2000, /* invert polarity of R/W bit */I2C_M_IGNORE_NAK = 0x1000, /* continue after NAK */I2C_M_NO_RD_ACK = 0x0800, /* skip the Ack bit on reads */I2C_M_RECV_LEN = 0x0400, /* length is first received byte*/ +};
+/**
- struct i2c_msg - an I2C message
- @addr: Slave address
- @flags: Flags (see enum dm_i2c_msg_flags)
- @len: Length of buffer in bytes
- @buf: Buffer to send/receive
- */
+struct i2c_msg {
uint addr;uint flags;uint len;u8 *buf;+};
+/**
- struct i2c_msg_list - a list of I2C messages
- This is called i2c_rdwr_ioctl_data in Linux but the name does not seem
- appropriate in U-Boot.
- @msg: Pointer to i2c_msg array
- @nmsgs: Number of elements in the array
- */
+struct i2c_msg_list {
struct i2c_msg *msgs;uint nmsgs;+};
+/**
- struct dm_i2c_ops - driver operations for I2C uclass
- Drivers should support these operations unless otherwise noted. These
- operations are intended to be used by uclass code, not directly from
- other code.
- */
+struct dm_i2c_ops {
/*** xfer() - transfer a list of I2C messages** @bus: Bus to read from* @chip_addr: Chip address to read from* @offset: Offset within chip to start reading* @olen: Length of chip offset in bytes* @buffer: Place to put data* @len: Number of bytes to read* @return 0 if OK, -EREMOTEIO if the slave did not ACK a byte,* other -ve value on some other error*/int (*xfer)(struct udevice *bus, struct i2c_msg *msg, int nmsgs);/*** set_bus_speed() - set the speed of a bus (optional)** The bus speed value will be updated by the uclass if thisfunction
* does not return an error.** @bus: Bus to adjust* @speed: Requested speed in Hz* @return 0 if OK, -INVAL for invalid values*/int (*set_bus_speed)(struct udevice *bus, unsigned int speed);/*** get_bus_speed() - get the speed of a bus (optional)** Normally this can be provided by the uclass, but if you wantyour
* driver to check the bus speed by looking at the hardware, youcan
* implement that here.** @bus: Bus to check* @return speed of selected I2C bus in Hz, -ve on error*/int (*get_bus_speed)(struct udevice *bus);/*** set_flags() - set the flags for a chip (optional)** This is generally implemented by the uclass, but drivers can* check the value to ensure that unsupported options are not used.* If provided, this method will always be called when the flags* change.** @dev: Chip to adjust* @flags: New flags value* @return 0 if OK, -EINVAL if value is unsupported*/int (*set_flags)(struct udevice *dev, uint flags);/*** set_offset_len() - set the offset length of a chip (optional)** This is generally implemented by the uclass, but drivers can* check the value to ensure that unsupported options are not used.* If provided, this method will always be called when the offset* length changes from the default of 1.** @dev: Chip to adjust* @addr_len: New offset length value (typically 1 or 2)* @return 0 if OK, -INVAL if value is unsupported*/int (*set_offset_len)(struct udevice *dev, uint offset_len);/*** deblock() - recover a bus that is in an unknown state** I2C is a synchronous protocol and resets of the processor in the* middle of an access can block the I2C Bus until a powerdown of* the full unit is done. This is because slaves can be stuck* waiting for addition bus transitions for a transaction that will* never complete. Resetting the I2C master does not help. The only* way is to force the bus through a series of transitions to make* sure that all slaves are done with the transaction. This method* performs this 'deblocking' if support by the driver.** This method is optional.*/int (*deblock)(struct udevice *bus);+};
+#define i2c_get_ops(dev) ((struct dm_i2c_ops *)(dev)->driver->ops)
+/**
- i2c_get_chip() - get a device to use to access a chip on a bus
- This returns the device for the given chip address. The device can then
- be used with calls to i2c_read(), i2c_write(), i2c_probe(), etc.
- @bus: Bus to examine
- @chip_addr: Chip address for the new device
- @devp: Returns pointer to new device if found or -ENODEV if not
found- */
+int i2c_get_chip(struct udevice *bus, uint chip_addr, struct udevice **devp);
+/**
- i2c_get_chip() - get a device to use to access a chip on a bus number
- This returns the device for the given chip address on a particular bus
- number.
- @busnum: Bus number to examine
- @chip_addr: Chip address for the new device
- @devp: Returns pointer to new device if found or -ENODEV if not
found- */
+int i2c_get_chip_for_busnum(int busnum, int chip_addr, struct udevice **devp);
+/**
- i2c_chip_ofdata_to_platdata() - Decode standard I2C platform data
- This decodes the chip address from a device tree node and puts it into
- its dm_i2c_chip structure. This should be called in your driver's
- ofdata_to_platdata() method.
- @blob: Device tree blob
- @node: Node offset to read from
- @spi: Place to put the decoded information
- */
+int i2c_chip_ofdata_to_platdata(const void *blob, int node,
struct dm_i2c_chip *chip);+#endif
+#ifndef CONFIG_DM_I2C
+/*
- WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
- The implementation MUST NOT use static or global variables if the
@@ -451,4 +796,7 @@ int i2c_get_bus_num_fdt(int node);
- @return 0 if port was reset, -1 if not found
*/ int i2c_reset_port_fdt(const void *blob, int node);
+#endif /* !CONFIG_DM_I2C */
#endif /* _I2C_H_ */
2.1.0.rc2.206.gedb03e5