i3c: master: Add driver for Analog Devices I3C Controller IP

Add support for Analog Devices I3C Controller IP, an AXI-interfaced IP
core that supports I3C and I2C devices, multiple speed-grades and
I3C IBIs.

Reviewed-by: Frank Li <[e-mail]>
Signed-off-by: Jorge Marques <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

MAINTAINERS

···
 M:	Jorge Marques <[e-mail]>
 S:	Maintained
 F:	Documentation/devicetree/bindings/i3c/adi,i3c-master.yaml
+F:	drivers/i3c/master/adi-i3c-master.c
 
 I3C DRIVER FOR CADENCE I3C MASTER IP
 M:	Przemysław Gaj <[e-mail]>

drivers/i3c/master/Kconfig

···
 # SPDX-License-Identifier: GPL-2.0-only
+config ADI_I3C_MASTER
+	tristate "Analog Devices I3C master driver"
+	depends on HAS_IOMEM
+	help
+	  Support for Analog Devices I3C Controller IP, an AXI-interfaced IP
+	  core that supports I3C and I2C devices, multiple speed-grades and I3C
+	  IBIs.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called adi-i3c-master.
+
 config CDNS_I3C_MASTER
 	tristate "Cadence I3C master driver"
 	depends on HAS_IOMEM

drivers/i3c/master/Makefile

···
 # SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_ADI_I3C_MASTER)		+= adi-i3c-master.o
 obj-$(CONFIG_CDNS_I3C_MASTER)		+= i3c-master-cdns.o
 obj-$(CONFIG_DW_I3C_MASTER)		+= dw-i3c-master.o
 obj-$(CONFIG_AST2600_I3C_MASTER)	+= ast2600-i3c-master.o

drivers/i3c/master/adi-i3c-master.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * I3C Controller driver
+ * Copyright 2025 Analog Devices Inc.
+ * Author: Jorge Marques <[e-mail]>
+ */
+
+#include <linux/bitops.h>
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/fpga/adi-axi-common.h>
+#include <linux/i3c/master.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include "../internals.h"
+
+#define ADI_MAX_DEVS			16
+#define ADI_HAS_MDB_FROM_BCR(x)		(FIELD_GET(BIT(2), (x)))
+
+#define REG_ENABLE			0x040
+
+#define REG_PID_L			0x054
+#define REG_PID_H			0x058
+#define REG_DCR_BCR_DA			0x05c
+#define   REG_DCR_BCR_DA_GET_DA(x)	FIELD_GET(GENMASK(22, 16), (x))
+#define   REG_DCR_BCR_DA_GET_BCR(x)	FIELD_GET(GENMASK(15, 8), (x))
+#define   REG_DCR_BCR_DA_GET_DCR(x)	FIELD_GET(GENMASK(7, 0), (x))
+
+#define REG_IRQ_MASK			0x080
+#define REG_IRQ_PENDING			0x084
+#define   REG_IRQ_PENDING_DAA		BIT(7)
+#define   REG_IRQ_PENDING_IBI		BIT(6)
+#define   REG_IRQ_PENDING_CMDR		BIT(5)
+
+#define REG_CMD_FIFO			0x0d4
+#define   REG_CMD_FIFO_0_IS_CCC		BIT(22)
+#define   REG_CMD_FIFO_0_BCAST		BIT(21)
+#define   REG_CMD_FIFO_0_SR		BIT(20)
+#define   REG_CMD_FIFO_0_LEN(l)		FIELD_PREP(GENMASK(19, 8), (l))
+#define   REG_CMD_FIFO_0_DEV_ADDR(a)	FIELD_PREP(GENMASK(7, 1), (a))
+#define   REG_CMD_FIFO_0_RNW		BIT(0)
+#define   REG_CMD_FIFO_1_CCC(id)	FIELD_PREP(GENMASK(7, 0), (id))
+
+#define REG_CMD_FIFO_ROOM		0x0c0
+#define REG_CMDR_FIFO			0x0d8
+#define   REG_CMDR_FIFO_UDA_ERROR	8
+#define   REG_CMDR_FIFO_NACK_RESP	6
+#define   REG_CMDR_FIFO_CE2_ERROR	4
+#define   REG_CMDR_FIFO_CE0_ERROR	1
+#define   REG_CMDR_FIFO_NO_ERROR	0
+#define   REG_CMDR_FIFO_ERROR(x)	FIELD_GET(GENMASK(23, 20), (x))
+#define   REG_CMDR_FIFO_XFER_BYTES(x)	FIELD_GET(GENMASK(19, 8), (x))
+
+#define REG_SDO_FIFO			0x0dc
+#define REG_SDO_FIFO_ROOM		0x0c8
+#define REG_SDI_FIFO			0x0e0
+#define REG_IBI_FIFO			0x0e4
+#define REG_FIFO_STATUS			0x0e8
+#define   REG_FIFO_STATUS_CMDR_EMPTY	BIT(0)
+#define   REG_FIFO_STATUS_IBI_EMPTY	BIT(1)
+
+#define REG_OPS				0x100
+#define   REG_OPS_PP_SG_MASK		GENMASK(6, 5)
+#define   REG_OPS_SET_SG(x)		FIELD_PREP(REG_OPS_PP_SG_MASK, (x))
+
+#define REG_IBI_CONFIG			0x140
+#define   REG_IBI_CONFIG_ENABLE		BIT(0)
+#define   REG_IBI_CONFIG_LISTEN		BIT(1)
+
+#define REG_DEV_CHAR			0x180
+#define   REG_DEV_CHAR_IS_I2C		BIT(0)
+#define   REG_DEV_CHAR_IS_ATTACHED	BIT(1)
+#define   REG_DEV_CHAR_BCR_IBI(x)	FIELD_PREP(GENMASK(3, 2), (x))
+#define   REG_DEV_CHAR_WEN		BIT(8)
+#define   REG_DEV_CHAR_ADDR(x)		FIELD_PREP(GENMASK(15, 9), (x))
+
+enum speed_grade {PP_SG_UNSET, PP_SG_1MHZ, PP_SG_3MHZ, PP_SG_6MHZ, PP_SG_12MHZ};
+
+struct adi_i3c_cmd {
+	u32 cmd0;
+	u32 cmd1;
+	u32 tx_len;
+	const void *tx_buf;
+	u32 rx_len;
+	void *rx_buf;
+	u32 error;
+};
+
+struct adi_i3c_xfer {
+	struct list_head node;
+	struct completion comp;
+	int ret;
+	unsigned int ncmds;
+	unsigned int ncmds_comp;
+	struct adi_i3c_cmd cmds[] __counted_by(ncmds);
+};
+
+struct adi_i3c_master {
+	struct i3c_master_controller base;
+	u32 free_rr_slots;
+	struct {
+		unsigned int num_slots;
+		struct i3c_dev_desc **slots;
+		spinlock_t lock; /* Protect IBI slot access */
+	} ibi;
+	struct {
+		struct list_head list;
+		struct adi_i3c_xfer *cur;
+		spinlock_t lock; /* Protect transfer */
+	} xferqueue;
+	void __iomem *regs;
+	struct clk *clk;
+	unsigned long i3c_scl_lim;
+	struct {
+		u8 addrs[ADI_MAX_DEVS];
+		u8 index;
+	} daa;
+};
+
+static inline struct adi_i3c_master *to_adi_i3c_master(struct i3c_master_controller *master)
+{
+	return container_of(master, struct adi_i3c_master, base);
+}
+
+static void adi_i3c_master_wr_to_tx_fifo(struct adi_i3c_master *master,
+					 const u8 *buf, unsigned int nbytes)
+{
+	unsigned int n, m;
+
+	n = readl(master->regs + REG_SDO_FIFO_ROOM);
+	m = min(n, nbytes);
+	i3c_writel_fifo(master->regs + REG_SDO_FIFO, buf, nbytes);
+}
+
+static void adi_i3c_master_rd_from_rx_fifo(struct adi_i3c_master *master,
+					   u8 *buf, unsigned int nbytes)
+{
+	i3c_readl_fifo(master->regs + REG_SDI_FIFO, buf, nbytes);
+}
+
+static bool adi_i3c_master_supports_ccc_cmd(struct i3c_master_controller *m,
+					    const struct i3c_ccc_cmd *cmd)
+{
+	if (cmd->ndests > 1)
+		return false;
+
+	switch (cmd->id) {
+	case I3C_CCC_ENEC(true):
+	case I3C_CCC_ENEC(false):
+	case I3C_CCC_DISEC(true):
+	case I3C_CCC_DISEC(false):
+	case I3C_CCC_RSTDAA(true):
+	case I3C_CCC_RSTDAA(false):
+	case I3C_CCC_ENTDAA:
+	case I3C_CCC_SETDASA:
+	case I3C_CCC_SETNEWDA:
+	case I3C_CCC_GETMWL:
+	case I3C_CCC_GETMRL:
+	case I3C_CCC_GETPID:
+	case I3C_CCC_GETBCR:
+	case I3C_CCC_GETDCR:
+	case I3C_CCC_GETSTATUS:
+	case I3C_CCC_GETHDRCAP:
+		return true;
+	default:
+		break;
+	}
+
+	return false;
+}
+
+static int adi_i3c_master_disable(struct adi_i3c_master *master)
+{
+	writel(0, master->regs + REG_IBI_CONFIG);
+
+	return 0;
+}
+
+static struct adi_i3c_xfer *adi_i3c_master_alloc_xfer(struct adi_i3c_master *master,
+						      unsigned int ncmds)
+{
+	struct adi_i3c_xfer *xfer;
+
+	xfer = kzalloc(struct_size(xfer, cmds, ncmds), GFP_KERNEL);
+	if (!xfer)
+		return NULL;
+
+	INIT_LIST_HEAD(&xfer->node);
+	xfer->ncmds = ncmds;
+	xfer->ret = -ETIMEDOUT;
+
+	return xfer;
+}
+
+static void adi_i3c_master_start_xfer_locked(struct adi_i3c_master *master)
+{
+	struct adi_i3c_xfer *xfer = master->xferqueue.cur;
+	unsigned int i, n, m;
+
+	if (!xfer)
+		return;
+
+	for (i = 0; i < xfer->ncmds; i++) {
+		struct adi_i3c_cmd *cmd = &xfer->cmds[i];
+
+		if (!(cmd->cmd0 & REG_CMD_FIFO_0_RNW))
+			adi_i3c_master_wr_to_tx_fifo(master, cmd->tx_buf, cmd->tx_len);
+	}
+
+	n = readl(master->regs + REG_CMD_FIFO_ROOM);
+	for (i = 0; i < xfer->ncmds; i++) {
+		struct adi_i3c_cmd *cmd = &xfer->cmds[i];
+
+		m = cmd->cmd0 & REG_CMD_FIFO_0_IS_CCC ? 2 : 1;
+		if (m > n)
+			break;
+		writel(cmd->cmd0, master->regs + REG_CMD_FIFO);
+		if (cmd->cmd0 & REG_CMD_FIFO_0_IS_CCC)
+			writel(cmd->cmd1, master->regs + REG_CMD_FIFO);
+		n -= m;
+	}
+}
+
+static void adi_i3c_master_end_xfer_locked(struct adi_i3c_master *master,
+					   u32 pending)
+{
+	struct adi_i3c_xfer *xfer = master->xferqueue.cur;
+	int i, ret = 0;
+
+	if (!xfer)
+		return;
+
+	while (!(readl(master->regs + REG_FIFO_STATUS) & REG_FIFO_STATUS_CMDR_EMPTY)) {
+		struct adi_i3c_cmd *cmd;
+		u32 cmdr, rx_len;
+
+		cmdr = readl(master->regs + REG_CMDR_FIFO);
+
+		cmd = &xfer->cmds[xfer->ncmds_comp++];
+		if (cmd->cmd0 & REG_CMD_FIFO_0_RNW) {
+			rx_len = min_t(u32, REG_CMDR_FIFO_XFER_BYTES(cmdr), cmd->rx_len);
+			adi_i3c_master_rd_from_rx_fifo(master, cmd->rx_buf, rx_len);
+		}
+		cmd->error = REG_CMDR_FIFO_ERROR(cmdr);
+	}
+
+	for (i = 0; i < xfer->ncmds_comp; i++) {
+		switch (xfer->cmds[i].error) {
+		case REG_CMDR_FIFO_NO_ERROR:
+			break;
+
+		case REG_CMDR_FIFO_CE0_ERROR:
+		case REG_CMDR_FIFO_CE2_ERROR:
+		case REG_CMDR_FIFO_NACK_RESP:
+		case REG_CMDR_FIFO_UDA_ERROR:
+			ret = -EIO;
+			break;
+
+		default:
+			ret = -EINVAL;
+			break;
+		}
+	}
+
+	xfer->ret = ret;
+
+	if (xfer->ncmds_comp != xfer->ncmds)
+		return;
+
+	complete(&xfer->comp);
+
+	xfer = list_first_entry_or_null(&master->xferqueue.list,
+					struct adi_i3c_xfer, node);
+	if (xfer)
+		list_del_init(&xfer->node);
+
+	master->xferqueue.cur = xfer;
+	adi_i3c_master_start_xfer_locked(master);
+}
+
+static void adi_i3c_master_queue_xfer(struct adi_i3c_master *master,
+				      struct adi_i3c_xfer *xfer)
+{
+	init_completion(&xfer->comp);
+	guard(spinlock_irqsave)(&master->xferqueue.lock);
+	if (master->xferqueue.cur) {
+		list_add_tail(&xfer->node, &master->xferqueue.list);
+	} else {
+		master->xferqueue.cur = xfer;
+		adi_i3c_master_start_xfer_locked(master);
+	}
+}
+
+static void adi_i3c_master_unqueue_xfer(struct adi_i3c_master *master,
+					struct adi_i3c_xfer *xfer)
+{
+	guard(spinlock_irqsave)(&master->xferqueue.lock);
+	if (master->xferqueue.cur == xfer)
+		master->xferqueue.cur = NULL;
+	else
+		list_del_init(&xfer->node);
+
+	writel(0x01, master->regs + REG_ENABLE);
+	writel(0x00, master->regs + REG_ENABLE);
+	writel(REG_IRQ_PENDING_CMDR, master->regs + REG_IRQ_MASK);
+}
+
+static enum i3c_error_code adi_i3c_cmd_get_err(struct adi_i3c_cmd *cmd)
+{
+	switch (cmd->error) {
+	case REG_CMDR_FIFO_CE0_ERROR:
+		return I3C_ERROR_M0;
+
+	case REG_CMDR_FIFO_CE2_ERROR:
+	case REG_CMDR_FIFO_NACK_RESP:
+		return I3C_ERROR_M2;
+
+	default:
+		break;
+	}
+
+	return I3C_ERROR_UNKNOWN;
+}
+
+static int adi_i3c_master_send_ccc_cmd(struct i3c_master_controller *m,
+				       struct i3c_ccc_cmd *cmd)
+{
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct adi_i3c_xfer *xfer __free(kfree) = NULL;
+	struct adi_i3c_cmd *ccmd;
+
+	xfer = adi_i3c_master_alloc_xfer(master, 1);
+	if (!xfer)
+		return -ENOMEM;
+
+	ccmd = xfer->cmds;
+	ccmd->cmd1 = REG_CMD_FIFO_1_CCC(cmd->id);
+	ccmd->cmd0 = REG_CMD_FIFO_0_IS_CCC |
+		     REG_CMD_FIFO_0_LEN(cmd->dests[0].payload.len);
+
+	if (cmd->id & I3C_CCC_DIRECT)
+		ccmd->cmd0 |= REG_CMD_FIFO_0_DEV_ADDR(cmd->dests[0].addr);
+
+	if (cmd->rnw) {
+		ccmd->cmd0 |= REG_CMD_FIFO_0_RNW;
+		ccmd->rx_buf = cmd->dests[0].payload.data;
+		ccmd->rx_len = cmd->dests[0].payload.len;
+	} else {
+		ccmd->tx_buf = cmd->dests[0].payload.data;
+		ccmd->tx_len = cmd->dests[0].payload.len;
+	}
+
+	adi_i3c_master_queue_xfer(master, xfer);
+	if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000)))
+		adi_i3c_master_unqueue_xfer(master, xfer);
+
+	cmd->err = adi_i3c_cmd_get_err(&xfer->cmds[0]);
+
+	return 0;
+}
+
+static int adi_i3c_master_priv_xfers(struct i3c_dev_desc *dev,
+				     struct i3c_priv_xfer *xfers,
+				     int nxfers)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct adi_i3c_xfer *xfer __free(kfree) = NULL;
+	int i, ret;
+
+	if (!nxfers)
+		return 0;
+
+	xfer = adi_i3c_master_alloc_xfer(master, nxfers);
+	if (!xfer)
+		return -ENOMEM;
+
+	for (i = 0; i < nxfers; i++) {
+		struct adi_i3c_cmd *ccmd = &xfer->cmds[i];
+
+		ccmd->cmd0 = REG_CMD_FIFO_0_DEV_ADDR(dev->info.dyn_addr);
+
+		if (xfers[i].rnw) {
+			ccmd->cmd0 |= REG_CMD_FIFO_0_RNW;
+			ccmd->rx_buf = xfers[i].data.in;
+			ccmd->rx_len = xfers[i].len;
+		} else {
+			ccmd->tx_buf = xfers[i].data.out;
+			ccmd->tx_len = xfers[i].len;
+		}
+
+		ccmd->cmd0 |= REG_CMD_FIFO_0_LEN(xfers[i].len);
+
+		if (i < nxfers - 1)
+			ccmd->cmd0 |= REG_CMD_FIFO_0_SR;
+
+		if (!i)
+			ccmd->cmd0 |= REG_CMD_FIFO_0_BCAST;
+	}
+
+	adi_i3c_master_queue_xfer(master, xfer);
+	if (!wait_for_completion_timeout(&xfer->comp,
+					 msecs_to_jiffies(1000)))
+		adi_i3c_master_unqueue_xfer(master, xfer);
+
+	ret = xfer->ret;
+
+	for (i = 0; i < nxfers; i++)
+		xfers[i].err = adi_i3c_cmd_get_err(&xfer->cmds[i]);
+
+	return ret;
+}
+
+struct adi_i3c_i2c_dev_data {
+	struct i3c_generic_ibi_pool *ibi_pool;
+	u16 id;
+	s16 ibi;
+};
+
+static int adi_i3c_master_get_rr_slot(struct adi_i3c_master *master,
+				      u8 dyn_addr)
+{
+	if (!master->free_rr_slots)
+		return -ENOSPC;
+
+	return ffs(master->free_rr_slots) - 1;
+}
+
+static int adi_i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev, u8 dyn_addr)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	u8 addr;
+
+	addr = dev->info.dyn_addr ? dev->info.dyn_addr : dev->info.static_addr;
+
+	writel(REG_DEV_CHAR_ADDR(dyn_addr), master->regs + REG_DEV_CHAR);
+	writel((readl(master->regs + REG_DEV_CHAR) &
+		~REG_DEV_CHAR_IS_ATTACHED) | REG_DEV_CHAR_WEN,
+	       master->regs + REG_DEV_CHAR);
+
+	writel(REG_DEV_CHAR_ADDR(addr), master->regs + REG_DEV_CHAR);
+	writel(readl(master->regs + REG_DEV_CHAR) |
+	       REG_DEV_CHAR_IS_ATTACHED | REG_DEV_CHAR_WEN,
+	       master->regs + REG_DEV_CHAR);
+
+	return 0;
+}
+
+static int adi_i3c_master_attach_i3c_dev(struct i3c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct adi_i3c_i2c_dev_data *data;
+	int slot;
+	u8 addr;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	slot = adi_i3c_master_get_rr_slot(master, dev->info.dyn_addr);
+	if (slot < 0) {
+		kfree(data);
+		return slot;
+	}
+
+	data->id = slot;
+	i3c_dev_set_master_data(dev, data);
+	master->free_rr_slots &= ~BIT(slot);
+
+	addr = dev->info.dyn_addr ? dev->info.dyn_addr : dev->info.static_addr;
+
+	writel(REG_DEV_CHAR_ADDR(addr), master->regs + REG_DEV_CHAR);
+	writel(readl(master->regs + REG_DEV_CHAR) |
+	       REG_DEV_CHAR_IS_ATTACHED | REG_DEV_CHAR_WEN,
+	       master->regs + REG_DEV_CHAR);
+
+	return 0;
+}
+
+static void adi_i3c_master_sync_dev_char(struct i3c_master_controller *m)
+{
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct i3c_dev_desc *i3cdev;
+	u32 bcr_ibi;
+	u8 addr;
+
+	i3c_bus_for_each_i3cdev(&m->bus, i3cdev) {
+		addr = i3cdev->info.dyn_addr ?
+		       i3cdev->info.dyn_addr : i3cdev->info.static_addr;
+		writel(REG_DEV_CHAR_ADDR(addr), master->regs + REG_DEV_CHAR);
+		bcr_ibi = FIELD_GET(I3C_BCR_IBI_PAYLOAD | I3C_BCR_IBI_REQ_CAP, (i3cdev->info.bcr));
+		writel(readl(master->regs + REG_DEV_CHAR) |
+		       REG_DEV_CHAR_BCR_IBI(bcr_ibi) | REG_DEV_CHAR_WEN,
+		       master->regs + REG_DEV_CHAR);
+	}
+}
+
+static void adi_i3c_master_detach_i3c_dev(struct i3c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct adi_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+	u8 addr;
+
+	addr = dev->info.dyn_addr ? dev->info.dyn_addr : dev->info.static_addr;
+
+	writel(REG_DEV_CHAR_ADDR(addr), master->regs + REG_DEV_CHAR);
+	writel((readl(master->regs + REG_DEV_CHAR) &
+		~REG_DEV_CHAR_IS_ATTACHED) | REG_DEV_CHAR_WEN,
+	       master->regs + REG_DEV_CHAR);
+
+	i3c_dev_set_master_data(dev, NULL);
+	master->free_rr_slots |= BIT(data->id);
+	kfree(data);
+}
+
+static int adi_i3c_master_attach_i2c_dev(struct i2c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i2c_dev_get_master(dev);
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct adi_i3c_i2c_dev_data *data;
+	int slot;
+
+	slot = adi_i3c_master_get_rr_slot(master, 0);
+	if (slot < 0)
+		return slot;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->id = slot;
+	master->free_rr_slots &= ~BIT(slot);
+	i2c_dev_set_master_data(dev, data);
+
+	writel(REG_DEV_CHAR_ADDR(dev->addr) |
+	       REG_DEV_CHAR_IS_I2C | REG_DEV_CHAR_IS_ATTACHED | REG_DEV_CHAR_WEN,
+	       master->regs + REG_DEV_CHAR);
+
+	return 0;
+}
+
+static void adi_i3c_master_detach_i2c_dev(struct i2c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i2c_dev_get_master(dev);
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct adi_i3c_i2c_dev_data *data = i2c_dev_get_master_data(dev);
+
+	writel(REG_DEV_CHAR_ADDR(dev->addr) |
+	       REG_DEV_CHAR_IS_I2C | REG_DEV_CHAR_WEN,
+	       master->regs + REG_DEV_CHAR);
+
+	i2c_dev_set_master_data(dev, NULL);
+	master->free_rr_slots |= BIT(data->id);
+	kfree(data);
+}
+
+static void adi_i3c_master_bus_cleanup(struct i3c_master_controller *m)
+{
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+
+	adi_i3c_master_disable(master);
+}
+
+static void adi_i3c_master_upd_i3c_scl_lim(struct adi_i3c_master *master)
+{
+	struct i3c_master_controller *m = &master->base;
+	struct i3c_bus *bus = i3c_master_get_bus(m);
+	u8 i3c_scl_lim = 0;
+	struct i3c_dev_desc *dev;
+	u8 pp_sg;
+
+	i3c_bus_for_each_i3cdev(bus, dev) {
+		u8 max_fscl;
+
+		max_fscl = max(I3C_CCC_MAX_SDR_FSCL(dev->info.max_read_ds),
+			       I3C_CCC_MAX_SDR_FSCL(dev->info.max_write_ds));
+
+		switch (max_fscl) {
+		case I3C_SDR1_FSCL_8MHZ:
+			max_fscl = PP_SG_6MHZ;
+			break;
+		case I3C_SDR2_FSCL_6MHZ:
+			max_fscl = PP_SG_3MHZ;
+			break;
+		case I3C_SDR3_FSCL_4MHZ:
+			max_fscl = PP_SG_3MHZ;
+			break;
+		case I3C_SDR4_FSCL_2MHZ:
+			max_fscl = PP_SG_1MHZ;
+			break;
+		case I3C_SDR0_FSCL_MAX:
+		default:
+			max_fscl = PP_SG_12MHZ;
+			break;
+		}
+
+		if (max_fscl &&
+		    (i3c_scl_lim > max_fscl || !i3c_scl_lim))
+			i3c_scl_lim = max_fscl;
+	}
+
+	if (!i3c_scl_lim)
+		return;
+
+	master->i3c_scl_lim = i3c_scl_lim - 1;
+
+	pp_sg = readl(master->regs + REG_OPS) & ~REG_OPS_PP_SG_MASK;
+	pp_sg |= REG_OPS_SET_SG(master->i3c_scl_lim);
+
+	writel(pp_sg, master->regs + REG_OPS);
+}
+
+static void adi_i3c_master_get_features(struct adi_i3c_master *master,
+					unsigned int slot,
+					struct i3c_device_info *info)
+{
+	u32 buf;
+
+	/* Dynamic address and PID are for identification only */
+	memset(info, 0, sizeof(*info));
+	buf = readl(master->regs + REG_DCR_BCR_DA);
+	info->dyn_addr = REG_DCR_BCR_DA_GET_DA(buf);
+	info->dcr = REG_DCR_BCR_DA_GET_DCR(buf);
+	info->bcr = REG_DCR_BCR_DA_GET_BCR(buf);
+	info->pid = readl(master->regs + REG_PID_L);
+	info->pid |= (u64)readl(master->regs + REG_PID_H) << 32;
+}
+
+static int adi_i3c_master_do_daa(struct i3c_master_controller *m)
+{
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	int ret, addr = 0;
+	u32 irq_mask;
+
+	for (u8 i = 0; i < ADI_MAX_DEVS; i++) {
+		addr = i3c_master_get_free_addr(m, addr);
+		if (addr < 0)
+			return addr;
+		master->daa.addrs[i] = addr;
+	}
+
+	irq_mask = readl(master->regs + REG_IRQ_MASK);
+	writel(irq_mask | REG_IRQ_PENDING_DAA,
+	       master->regs + REG_IRQ_MASK);
+
+	master->daa.index = 0;
+	ret = i3c_master_entdaa_locked(&master->base);
+
+	writel(irq_mask, master->regs + REG_IRQ_MASK);
+
+	/* DAA always finishes with CE2_ERROR or NACK_RESP */
+	if (ret && ret != I3C_ERROR_M2)
+		return ret;
+
+	/* Add I3C devices discovered */
+	for (u8 i = 0; i < master->daa.index; i++)
+		i3c_master_add_i3c_dev_locked(m, master->daa.addrs[i]);
+	/* Sync retrieved devs info with the IP */
+	adi_i3c_master_sync_dev_char(m);
+
+	i3c_master_defslvs_locked(&master->base);
+
+	adi_i3c_master_upd_i3c_scl_lim(master);
+
+	return 0;
+}
+
+static int adi_i3c_master_bus_init(struct i3c_master_controller *m)
+{
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct i3c_device_info info = { };
+	int ret;
+
+	ret = i3c_master_get_free_addr(m, 0);
+	if (ret < 0)
+		return ret;
+
+	adi_i3c_master_get_features(master, 0, &info);
+	ret = i3c_master_set_info(&master->base, &info);
+	if (ret)
+		return ret;
+
+	writel(REG_IBI_CONFIG_LISTEN,
+	       master->regs + REG_IBI_CONFIG);
+
+	return 0;
+}
+
+static void adi_i3c_master_handle_ibi(struct adi_i3c_master *master,
+				      u32 raw)
+{
+	struct adi_i3c_i2c_dev_data *data;
+	struct i3c_ibi_slot *slot;
+	struct i3c_dev_desc *dev;
+	u8 da, id, mdb, len;
+	u8 *buf;
+
+	da = FIELD_GET(GENMASK(23, 17), raw);
+	mdb = FIELD_GET(GENMASK(15, 8), raw);
+	for (id = 0; id < master->ibi.num_slots; id++) {
+		if (master->ibi.slots[id] &&
+		    master->ibi.slots[id]->info.dyn_addr == da)
+			break;
+	}
+
+	if (id == master->ibi.num_slots)
+		return;
+
+	dev = master->ibi.slots[id];
+	len = ADI_HAS_MDB_FROM_BCR(dev->info.bcr);
+	data = i3c_dev_get_master_data(dev);
+
+	guard(spinlock)(&master->ibi.lock);
+	slot = i3c_generic_ibi_get_free_slot(data->ibi_pool);
+	if (!slot)
+		return;
+
+	slot->len = len;
+	buf = slot->data;
+	buf[0] = mdb;
+	i3c_master_queue_ibi(dev, slot);
+}
+
+static void adi_i3c_master_demux_ibis(struct adi_i3c_master *master)
+{
+	while (!(readl(master->regs + REG_FIFO_STATUS) & REG_FIFO_STATUS_IBI_EMPTY)) {
+		u32 raw = readl(master->regs + REG_IBI_FIFO);
+
+		adi_i3c_master_handle_ibi(master, raw);
+	}
+}
+
+static void adi_i3c_master_handle_da_req(struct adi_i3c_master *master)
+{
+	u8 payload0[8];
+	u32 addr;
+
+	adi_i3c_master_rd_from_rx_fifo(master, payload0, 6);
+	addr = master->daa.addrs[master->daa.index++];
+	addr = (addr << 1) | (parity8(addr) ? 0 : 1);
+
+	writel(addr, master->regs + REG_SDO_FIFO);
+}
+
+static irqreturn_t adi_i3c_master_irq(int irq, void *data)
+{
+	struct adi_i3c_master *master = data;
+	u32 pending;
+
+	pending = readl(master->regs + REG_IRQ_PENDING);
+	writel(pending, master->regs + REG_IRQ_PENDING);
+	if (pending & REG_IRQ_PENDING_CMDR) {
+		scoped_guard(spinlock_irqsave, &master->xferqueue.lock) {
+			adi_i3c_master_end_xfer_locked(master, pending);
+		}
+	}
+	if (pending & REG_IRQ_PENDING_IBI)
+		adi_i3c_master_demux_ibis(master);
+	if (pending & REG_IRQ_PENDING_DAA)
+		adi_i3c_master_handle_da_req(master);
+
+	return IRQ_HANDLED;
+}
+
+static int adi_i3c_master_i2c_xfers(struct i2c_dev_desc *dev,
+				    struct i2c_msg *xfers,
+				    int nxfers)
+{
+	struct i3c_master_controller *m = i2c_dev_get_master(dev);
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct adi_i3c_xfer *xfer __free(kfree) = NULL;
+	int i;
+
+	if (!nxfers)
+		return 0;
+	for (i = 0; i < nxfers; i++) {
+		if (xfers[i].flags & I2C_M_TEN)
+			return -EOPNOTSUPP;
+	}
+	xfer = adi_i3c_master_alloc_xfer(master, nxfers);
+	if (!xfer)
+		return -ENOMEM;
+
+	for (i = 0; i < nxfers; i++) {
+		struct adi_i3c_cmd *ccmd = &xfer->cmds[i];
+
+		ccmd->cmd0 = REG_CMD_FIFO_0_DEV_ADDR(xfers[i].addr);
+
+		if (xfers[i].flags & I2C_M_RD) {
+			ccmd->cmd0 |= REG_CMD_FIFO_0_RNW;
+			ccmd->rx_buf = xfers[i].buf;
+			ccmd->rx_len = xfers[i].len;
+		} else {
+			ccmd->tx_buf = xfers[i].buf;
+			ccmd->tx_len = xfers[i].len;
+		}
+
+		ccmd->cmd0 |= REG_CMD_FIFO_0_LEN(xfers[i].len);
+	}
+
+	adi_i3c_master_queue_xfer(master, xfer);
+	if (!wait_for_completion_timeout(&xfer->comp,
+					 m->i2c.timeout))
+		adi_i3c_master_unqueue_xfer(master, xfer);
+
+	return xfer->ret;
+}
+
+static int adi_i3c_master_disable_ibi(struct i3c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct i3c_dev_desc *i3cdev;
+	u32 enabled = 0;
+	int ret;
+
+	ret = i3c_master_disec_locked(m, dev->info.dyn_addr,
+				      I3C_CCC_EVENT_SIR);
+
+	i3c_bus_for_each_i3cdev(&m->bus, i3cdev) {
+		if (dev != i3cdev && i3cdev->ibi)
+			enabled |= i3cdev->ibi->enabled;
+	}
+	if (!enabled) {
+		writel(REG_IBI_CONFIG_LISTEN,
+		       master->regs + REG_IBI_CONFIG);
+		writel(readl(master->regs + REG_IRQ_MASK) & ~REG_IRQ_PENDING_IBI,
+		       master->regs + REG_IRQ_MASK);
+	}
+
+	return ret;
+}
+
+static int adi_i3c_master_enable_ibi(struct i3c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+
+	writel(REG_IBI_CONFIG_LISTEN | REG_IBI_CONFIG_ENABLE,
+	       master->regs + REG_IBI_CONFIG);
+
+	writel(readl(master->regs + REG_IRQ_MASK) | REG_IRQ_PENDING_IBI,
+	       master->regs + REG_IRQ_MASK);
+
+	return i3c_master_enec_locked(m, dev->info.dyn_addr,
+				      I3C_CCC_EVENT_SIR);
+}
+
+static int adi_i3c_master_request_ibi(struct i3c_dev_desc *dev,
+				      const struct i3c_ibi_setup *req)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct adi_i3c_i2c_dev_data *data;
+	unsigned int i;
+
+	data = i3c_dev_get_master_data(dev);
+	data->ibi_pool = i3c_generic_ibi_alloc_pool(dev, req);
+	if (IS_ERR(data->ibi_pool))
+		return PTR_ERR(data->ibi_pool);
+
+	scoped_guard(spinlock_irqsave, &master->ibi.lock) {
+		for (i = 0; i < master->ibi.num_slots; i++) {
+			if (!master->ibi.slots[i]) {
+				data->ibi = i;
+				master->ibi.slots[i] = dev;
+				break;
+			}
+		}
+	}
+
+	if (i < master->ibi.num_slots)
+		return 0;
+
+	i3c_generic_ibi_free_pool(data->ibi_pool);
+	data->ibi_pool = NULL;
+
+	return -ENOSPC;
+}
+
+static void adi_i3c_master_free_ibi(struct i3c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct adi_i3c_master *master = to_adi_i3c_master(m);
+	struct adi_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+
+	scoped_guard(spinlock_irqsave, &master->ibi.lock) {
+		master->ibi.slots[data->ibi] = NULL;
+	}
+
+	i3c_generic_ibi_free_pool(data->ibi_pool);
+}
+
+static void adi_i3c_master_recycle_ibi_slot(struct i3c_dev_desc *dev,
+					    struct i3c_ibi_slot *slot)
+{
+	struct adi_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+
+	i3c_generic_ibi_recycle_slot(data->ibi_pool, slot);
+}
+
+static const struct i3c_master_controller_ops adi_i3c_master_ops = {
+	.bus_init = adi_i3c_master_bus_init,
+	.bus_cleanup = adi_i3c_master_bus_cleanup,
+	.attach_i3c_dev = adi_i3c_master_attach_i3c_dev,
+	.reattach_i3c_dev = adi_i3c_master_reattach_i3c_dev,
+	.detach_i3c_dev = adi_i3c_master_detach_i3c_dev,
+	.attach_i2c_dev = adi_i3c_master_attach_i2c_dev,
+	.detach_i2c_dev = adi_i3c_master_detach_i2c_dev,
+	.do_daa = adi_i3c_master_do_daa,
+	.supports_ccc_cmd = adi_i3c_master_supports_ccc_cmd,
+	.send_ccc_cmd = adi_i3c_master_send_ccc_cmd,
+	.priv_xfers = adi_i3c_master_priv_xfers,
+	.i2c_xfers = adi_i3c_master_i2c_xfers,
+	.request_ibi = adi_i3c_master_request_ibi,
+	.enable_ibi = adi_i3c_master_enable_ibi,
+	.disable_ibi = adi_i3c_master_disable_ibi,
+	.free_ibi = adi_i3c_master_free_ibi,
+	.recycle_ibi_slot = adi_i3c_master_recycle_ibi_slot,
+};
+
+static const struct of_device_id adi_i3c_master_of_match[] = {
+	{ .compatible = "adi,i3c-master-v1" },
+	{}
+};
+
+static int adi_i3c_master_probe(struct platform_device *pdev)
+{
+	struct adi_i3c_master *master;
+	struct clk_bulk_data *clk;
+	unsigned int version;
+	int ret, irq;
+
+	master = devm_kzalloc(&pdev->dev, sizeof(*master), GFP_KERNEL);
+	if (!master)
+		return -ENOMEM;
+
+	master->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(master->regs))
+		return PTR_ERR(master->regs);
+
+	ret = devm_clk_bulk_get_all_enabled(&pdev->dev, &clk);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "Failed to get clocks\n");
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	version = readl(master->regs + ADI_AXI_REG_VERSION);
+	if (ADI_AXI_PCORE_VER_MAJOR(version) != 1)
+		dev_err_probe(&pdev->dev, -ENODEV, "Unsupported peripheral version %u.%u.%u\n",
+			      ADI_AXI_PCORE_VER_MAJOR(version),
+			      ADI_AXI_PCORE_VER_MINOR(version),
+			      ADI_AXI_PCORE_VER_PATCH(version));
+
+	writel(0x00, master->regs + REG_ENABLE);
+	writel(0x00, master->regs + REG_IRQ_MASK);
+
+	ret = devm_request_irq(&pdev->dev, irq, adi_i3c_master_irq, 0,
+			       dev_name(&pdev->dev), master);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, master);
+
+	master->free_rr_slots = GENMASK(ADI_MAX_DEVS, 1);
+
+	writel(REG_IRQ_PENDING_CMDR, master->regs + REG_IRQ_MASK);
+
+	spin_lock_init(&master->ibi.lock);
+	master->ibi.num_slots = 15;
+	master->ibi.slots = devm_kcalloc(&pdev->dev, master->ibi.num_slots,
+					 sizeof(*master->ibi.slots),
+					 GFP_KERNEL);
+	if (!master->ibi.slots)
+		return -ENOMEM;
+
+	spin_lock_init(&master->xferqueue.lock);
+	INIT_LIST_HEAD(&master->xferqueue.list);
+
+	return i3c_master_register(&master->base, &pdev->dev,
+				   &adi_i3c_master_ops, false);
+}
+
+static void adi_i3c_master_remove(struct platform_device *pdev)
+{
+	struct adi_i3c_master *master = platform_get_drvdata(pdev);
+
+	writel(0xff, master->regs + REG_IRQ_PENDING);
+	writel(0x00, master->regs + REG_IRQ_MASK);
+	writel(0x01, master->regs + REG_ENABLE);
+
+	i3c_master_unregister(&master->base);
+}
+
+static struct platform_driver adi_i3c_master = {
+	.probe = adi_i3c_master_probe,
+	.remove = adi_i3c_master_remove,
+	.driver = {
+		.name = "adi-i3c-master",
+		.of_match_table = adi_i3c_master_of_match,
+	},
+};
+module_platform_driver(adi_i3c_master);
+
+MODULE_AUTHOR("Jorge Marques <[e-mail]>");
+MODULE_DESCRIPTION("Analog Devices I3C master driver");
+MODULE_LICENSE("GPL");