WIP: driver: i3c: add it51xxx i3cm driver

**DO NOT FORGET TO RUN CLANG-FORMAT**

Build:
west build -p always -b it513xx_evb samples/hello_world/ \
-DCONFIG_I3C=y -DCONFIG_I3C_SHELL=y -DCONFIG_I3C_USE_IBI=y -DCONFIG_LOG=y

Test plan:
- i3c shell
- controller role
  - ccc command
    [Pass] (B)RSTDAA: $i3c ccc rstdaa i3c@f03c00
    [Pass] (B)ENTDAA: $i3c ccc entdaa i3c@f03c00
    [Pass] (D)GETPID: $i3c ccc getpid i3c@f03c00 i3c_dummy@2f000005fa00010002
    [Pass] (D)GETBCR: $i3c ccc getbcr i3c@f03c00 i3c_dummy@2f000005fa00010002
    [Pass] (D)GETDCR: $i3c ccc getdcr i3c@f03c00 i3c_dummy@2f000005fa00010002
    [Pass] (D)SETMWL:
                 $i3c ccc setmwl i3c@f03c00 i3c_dummy@2f000005fa00010002 BB
                 $devmem 0xf03d6a 8
                 $devmem 0xf03d6b 8
    [Pass] (D)GETMWL: $i3c ccc getmwl i3c@f03c00 i3c_dummy@2f000005fa00010002
    [Pass] direct read ccc with repeated start flag
    [Pass] direct write ccc with repeated start flag
  - (dynamic address) ENTDAA/SETAASA/SETDASA
    [Pass] ENTDAA(1-I3CM to 1-I3CS / 1-I3CM to 2-I3CS)
           $i3c ccc entdaa i3c@f03c00
           // check i3cs0 dynamic address
           $devmem 0xf03d64 8
           // check i3cs1 dynamic address
           $devmem 0xf03de4 8
    [Pass] SETDASA
           $i3c ccc rstdaa i3c@f03c00
           $i3c ccc setdasa i3c@f03c00 i3c_dummy@18000005fa00010001 0x18
           $i3c ccc setdasa i3c@f03c00 i3c_dummy@19000005fa00010002 0x19
           $i3c ccc getpid i3c@f03c00 i3c_dummy@18000005fa00010001
           $i3c ccc getpid i3c@f03c00 i3c_dummy@19000005fa00010002
    [Pass] SETAASA(note: need to enable the "supports-setaasa" property)
           $i3c ccc rstdaa i3c@f03c00
           $i3c ccc setaasa i3c@f03c00
           $i3c info i3c@f03c00
           $i3c ccc getpid i3c@f03c00 i3c_dummy@18000005fa00010001
           $i3c ccc getpid i3c@f03c00 i3c_dummy@19000005fa00010002
  - [Pass] (ibi) hot-join
    $i3c ccc rstdaa i3c@f03c00
    // generate i3cs0 hj event
    $devmem 0xf03d0c 8 0x03
    $i3c ccc getpid i3c@f03c00 i3c_dummy@18000005fa00010001
    $i3c ccc getpid i3c@f03c00 i3c_dummy@19000005fa00010002
  - [GG] (ibi) target interrupt
  - [Unsupported??](ibi) secondary controller request
    Check the PR: zephyrproject-rtos#78361
  - private transfer(with/without 7Eh address)
    [pending] (with 7Eh, start flag)
    [pending] (with 7Eh, repeated start flag)
    [pending] (without 7Eh, start flag)
    [pending] (without 7Eh, repeated start flag)
  - legacy i2c private transfer

Question:
- exit hdr pattern is sent if no target responses 7Eh address
- how to ack dynamic address assignment(I3CM15'b[1])
- what is i3cm ccc with defining byte(I3CM15'b[0] and I3CM16)
- timing control
- secondary controller, IBI controller request are supported??

Note:
- MIPI I3C v1.0 not support direct ccc with data byte(defining byte), therefore,
  > RSTACT(9Ah): unsupported
  > GETCAPS(95h), GETSTATUS(90h): only support format 1
  > GETMXDS(94h): only support format 1 and 2

Change-Id: I7cb70eccf17faf4360d70ba5833bd31a00b5343e
Signed-off-by: Ren Chen <[email protected]>

boards/ite/it513xx_evb/it513xx_evb.dts

@@ -74,3 +74,30 @@
 		};
 	};
 };
+
+&i3c0 {
+	status = "okay";
+	/* TODO: FIXME */
+	pinctrl-0 = <&i3c0_clk_gpj3_default
+		     &i3c0_data_gpj4_default
+		     &i3c1_clk_gpj5_default
+		     &i3c1_data_gpe1_default
+		     &i3c2_clk_gpe2_default
+		     &i3c2_data_gpe3_default
+		     &i3c3_clk_gpf0_default
+		     &i3c3_data_gpf1_default>;
+	pinctrl-names = "default";
+
+	i3c_dummy_1: i3c_dummy@19000005fa00010002 {
+		compatible = "i3c-dummy-device";
+		reg = <0x19 0x05fa 0x00010002>;
+		supports-setaasa;
+		status = "okay";
+	};
+	i3c_dummy_2: i3c_dummy@18000005fa00010001 {
+		compatible = "i3c-dummy-device";
+		reg = <0x18 0x05fa 0x00010001>;
+		supports-setaasa;
+		status = "okay";
+	};
+};

drivers/i3c/CMakeLists.txt

@@ -41,6 +41,16 @@ zephyr_library_sources_ifdef(
   i3c_npcx.c
 )
 
+zephyr_library_sources_ifdef(
+  CONFIG_I3C_IT51XXX
+  i3c_it51xxx.c
+)
+
+zephyr_library_sources_ifdef(
+  CONFIG_I3C_DUMMY_DEVICE
+  i3c_dummy_device.c
+)
+
 zephyr_library_sources_ifdef(
   CONFIG_I3C_TEST
   i3c_test.c

drivers/i3c/Kconfig

@@ -33,6 +33,10 @@ config I3C_USE_GROUP_ADDR
 
 	  Says Y if unsure.
 
+config I3C_DUMMY_DEVICE
+	bool "I3C dummy device driver"
+	default y
+
 menuconfig I3C_USE_IBI
 	bool "Use In-Band Interrupt (IBI)"
 	default y
@@ -118,5 +122,6 @@ rsource "Kconfig.nxp"
 rsource "Kconfig.cdns"
 rsource "Kconfig.npcx"
 rsource "Kconfig.test"
+rsource "Kconfig.it51xxx"
 
 endif # I3C

drivers/i3c/Kconfig.it51xxx

@@ -0,0 +1,25 @@
+# Copyright (c) 2025 ITE Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+DT_COMPAT_ITE_IT51XXX_I3C := ite,it51xxx-i3cm
+
+module = I3C_IT51XXX
+module-str = i3c-it51xxx
+source "subsys/logging/Kconfig.template.log_config"
+
+config I3C_IT51XXX
+	bool "IT51XXX I3CM driver"
+	depends on DT_HAS_ITE_IT51XXX_I3CM_ENABLED
+	select PINCTRL
+	select I3C_IBI_WORKQUEUE if I3C_USE_IBI
+	select SOC_IT51XXX_CPU_IDLE_GATING
+	default y
+	help
+	  Enable it51xxx i3cm driver.
+
+config I3C_IT51XXX_DLM_SIZE
+	int "IT51XXX I3CM DLM data size"
+	depends on I3C_IT51XXX
+	default 1024
+	help
+	  Set i3cm data-local-memory(DLM) size.

drivers/i3c/i3c_dummy_device.c

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2025 ITE Technology Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define DT_DRV_COMPAT i3c_dummy_device
+
+#include <zephyr/sys/util.h>
+#include <zephyr/device.h>
+#include <zephyr/kernel.h>
+#include <zephyr/init.h>
+#include <zephyr/sys/sys_io.h>
+#include <zephyr/sys/util.h>
+#include <zephyr/drivers/i3c.h>
+
+#include <zephyr/logging/log.h>
+#define LOG_MODULE_NAME i3c_dummy_device
+LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL_DBG);
+
+#define IBI_MDB_GROUP                   GENMASK(7, 5)
+#define IBI_MDB_GROUP_PENDING_READ_NOTI 5
+#define IBI_MDB_SPEC_ID                 GENMASK(4, 0)
+
+#define MAX_READ_DATA_LEN 64
+
+struct i3c_dummy_device_config {
+	const struct device *bus;
+	const uint64_t pid;
+};
+
+struct i3c_dummy_device_data {
+	struct i3c_device_desc *desc;
+	struct k_work work;
+	uint8_t buf[MAX_READ_DATA_LEN];
+};
+
+static void i3c_dummy_device_work(struct k_work *work)
+{
+	struct i3c_dummy_device_data *data = CONTAINER_OF(work, struct i3c_dummy_device_data, work);
+	struct i3c_msg msg;
+
+	msg.buf = data->buf;
+	msg.len = MAX_READ_DATA_LEN;
+	msg.flags = I3C_MSG_READ | I3C_MSG_STOP;
+	i3c_transfer(data->desc, &msg, 1);
+	LOG_HEXDUMP_INF(msg.buf, msg.len, "Pending read data:");
+}
+
+static int i3c_dummy_device_ibi_cb(struct i3c_device_desc *target, struct i3c_ibi_payload *payload)
+{
+	const struct device *dev = target->dev;
+	struct i3c_dummy_device_data *data = dev->data;
+
+	if (payload->payload_len) {
+		LOG_HEXDUMP_INF(payload->payload, payload->payload_len, "IBI payload:");
+
+		if (FIELD_GET(IBI_MDB_GROUP, payload->payload[0]) ==
+		    IBI_MDB_GROUP_PENDING_READ_NOTI) {
+			k_work_submit(&data->work);
+		}
+	}
+
+	return 0;
+}
+
+static int i3c_dummy_device_init(const struct device *dev)
+{
+	const struct i3c_dummy_device_config *config = dev->config;
+	struct i3c_dummy_device_data *data = dev->data;
+	uint64_t pid = config->pid;
+	const struct i3c_device_id i3c_id = I3C_DEVICE_ID(pid);
+
+	LOG_INF("%s (%012llx) belongs to bus %s", dev->name, config->pid, config->bus->name);
+
+	data->desc = i3c_device_find(config->bus, &i3c_id);
+	i3c_ibi_enable(data->desc);
+
+	data->desc->ibi_cb = i3c_dummy_device_ibi_cb;
+	k_work_init(&data->work, i3c_dummy_device_work);
+
+	return 0;
+}
+
+#define I3C_DUMMY_DEVICE_INIT(n)                                                                   \
+	static const struct i3c_dummy_device_config i3c_dummy_device_config_##n = {                \
+		.bus = DEVICE_DT_GET(DT_INST_BUS(n)),                                              \
+		.pid = ((uint64_t)DT_PROP_BY_IDX(DT_DRV_INST(n), reg, 1) << 32) |                  \
+		       DT_PROP_BY_IDX(DT_DRV_INST(n), reg, 2),                                     \
+	};                                                                                         \
+                                                                                                   \
+	static struct i3c_dummy_device_data i3c_dummy_device_data_##n;                             \
+	DEVICE_DT_INST_DEFINE(n, i3c_dummy_device_init, NULL, &i3c_dummy_device_data_##n,          \
+			      &i3c_dummy_device_config_##n, POST_KERNEL, 51, NULL);
+
+DT_INST_FOREACH_STATUS_OKAY(I3C_DUMMY_DEVICE_INIT)