[PATCH 06/10] drivers: i3c: Add i3c uclass driver.

[dinesh.maniyam at intel.com]

From: Dinesh Maniyam <dinesh.maniyam at intel.com>

Enable i3c general uclass driver. This uclass driver will have
genaral read and write api to call the specific i3c driver.

Signed-off-by: Dinesh Maniyam <dinesh.maniyam at intel.com>
---
 drivers/i3c/Makefile     |  1 +
 drivers/i3c/i3c-uclass.c | 38 ++++++++++++++++++++++++
 include/dw-i3c.h         |  1 +
 include/i3c.h            | 63 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 103 insertions(+)
 create mode 100644 drivers/i3c/i3c-uclass.c
 create mode 100644 include/i3c.h

diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile
index 2d42864d79..d560939145 100644
--- a/drivers/i3c/Makefile
+++ b/drivers/i3c/Makefile
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
+obj-y += i3c-uclass.o
 obj-$(CONFIG_DW_I3C_MASTER) += dw-i3c-master.o
\ No newline at end of file
diff --git a/drivers/i3c/i3c-uclass.c b/drivers/i3c/i3c-uclass.c
new file mode 100644
index 0000000000..644f578889
--- /dev/null
+++ b/drivers/i3c/i3c-uclass.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2025 Altera Corporation <www.altera.com>
+ */
+
+#include <dm.h>
+#include <i3c.h>
+#include <errno.h>
+#include <log.h>
+#include <dm/device-internal.h>
+#include <linux/ctype.h>
+
+int dm_i3c_read(struct udevice *dev, u8 dev_number,
+		u8 *buf, int num_bytes)
+{
+	struct dm_i3c_ops *ops = i3c_get_ops(dev);
+
+	if (!ops->read)
+		return -ENOSYS;
+
+	return ops->read(dev, dev_number, buf, num_bytes);
+}
+
+int dm_i3c_write(struct udevice *dev, u8 dev_number,
+		 u8 *buf, int num_bytes)
+{
+	struct dm_i3c_ops *ops = i3c_get_ops(dev);
+
+	if (!ops->write)
+		return -ENOSYS;
+
+	return ops->write(dev, dev_number, buf, num_bytes);
+}
+
+UCLASS_DRIVER(i3c) = {
+	.id		= UCLASS_I3C,
+	.name		= "i3c",
+};
diff --git a/include/dw-i3c.h b/include/dw-i3c.h
index e37fd4dc32..920f18bccb 100644
--- a/include/dw-i3c.h
+++ b/include/dw-i3c.h
@@ -7,6 +7,7 @@
 #define _DW_I3C_H_
 
 #include <clk.h>
+#include <i3c.h>
 #include <reset.h>
 #include <dm/device.h>
 #include <linux/bitops.h>
diff --git a/include/i3c.h b/include/i3c.h
new file mode 100644
index 0000000000..6ef4982dcf
--- /dev/null
+++ b/include/i3c.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2025 Altera Corporation <www.altera.com>
+ */
+
+#include <linux/i3c/master.h>
+
+/**
+ * struct dm_i3c_ops - driver operations for i3c 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_i3c_ops {
+	/**
+	 * Transfer messages in I3C mode.
+	 *
+	 * @see i3c_transfer
+	 *
+	 * @param dev Pointer to controller device driver instance.
+	 * @param target Pointer to target device descriptor.
+	 * @param msg Pointer to I3C messages.
+	 * @param num_msgs Number of messages to transfer.
+	 *
+	 * @return @see i3c_transfer
+	 */
+	int (*i3c_xfers)(struct i3c_dev_desc *dev,
+			 struct i3c_priv_xfer *i3c_xfers,
+			 int i3c_nxfers);
+};
+
+#define i3c_get_ops(dev)	((struct dm_i3c_ops *)(dev)->driver->ops)
+
+/**
+ * @brief Do i3c write
+ *
+ * Uclass general function to start write to i3c target
+ *
+ * @udevice pointer to i3c controller.
+ * @dev_number target device number.
+ * @buf target Buffer to write.
+ * @num_bytes length of bytes to write.
+ *
+ * @return 0 for success
+ */
+int dm_i3c_write(struct udevice *dev, u8 dev_number,
+		 u8 *buf, int num_bytes);
+
+/**
+ * @brief Do i3c read
+ *
+ * Uclass general function to start read from i3c target
+ *
+ * @udevice pointer to i3c controller.
+ * @dev_number target device number.
+ * @buf target Buffer to read.
+ * @num_bytes length of bytes to read.
+ *
+ * @return 0 for success
+ */
+int dm_i3c_read(struct udevice *dev, u8 dev_number,
+		u8 *buf, int num_bytes);
-- 
2.26.2