Merge tag 'i2c-for-6.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:

 - designware: initialise msg_write_idx during transfer

 - microchip: check return value from core xfer call

 - realtek: add 'reg' property constraint to the device tree

* tag 'i2c-for-6.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  dt-bindings: i2c: realtek,rtl9301: Fix missing 'reg' constraint
  i2c: microchip-core: re-fix fake detections w/ i2cdetect
  i2c/designware: Fix an initialization issue

Author: torvalds

Documentation/devicetree/bindings/i2c/realtek,rtl9301-i2c.yaml

@@ -26,7 +26,8 @@ properties:
       - const: realtek,rtl9301-i2c
 
   reg:
-    description: Register offset and size this I2C controller.
+    items:
+      - description: Register offset and size this I2C controller.
 
   "#address-cells":
     const: 1

drivers/i2c/busses/i2c-designware-master.c

@@ -363,6 +363,7 @@ static int amd_i2c_dw_xfer_quirk(struct i2c_adapter *adap, struct i2c_msg *msgs,
 
 	dev->msgs = msgs;
 	dev->msgs_num = num_msgs;
+	dev->msg_write_idx = 0;
 	i2c_dw_xfer_init(dev);
 
 	/* Initiate messages read/write transaction */

drivers/i2c/busses/i2c-microchip-corei2c.c

@@ -435,6 +435,7 @@ static int mchp_corei2c_smbus_xfer(struct i2c_adapter *adap, u16 addr, unsigned
 	u8 tx_buf[I2C_SMBUS_BLOCK_MAX + 2];
 	u8 rx_buf[I2C_SMBUS_BLOCK_MAX + 1];
 	int num_msgs = 1;
+	int ret;
 
 	msgs[CORE_I2C_SMBUS_MSG_WR].addr = addr;
 	msgs[CORE_I2C_SMBUS_MSG_WR].flags = 0;
@@ -505,7 +506,10 @@ static int mchp_corei2c_smbus_xfer(struct i2c_adapter *adap, u16 addr, unsigned
 		return -EOPNOTSUPP;
 	}
 
-	mchp_corei2c_xfer(&idev->adapter, msgs, num_msgs);
+	ret = mchp_corei2c_xfer(&idev->adapter, msgs, num_msgs);
+	if (ret < 0)
+		return ret;
+
 	if (read_write == I2C_SMBUS_WRITE || size <= I2C_SMBUS_BYTE_DATA)
 		return 0;