Merge branch 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
"A bunch of driver bugfixes and a MAINTAINERS addition"

* 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
MAINTAINERS: add entry for STM32 I2C driver
i2c: viperboard: return message count on master_xfer success
i2c: pmcmsp: fix error return from master_xfer
i2c: pmcmsp: return message count on master_xfer success
i2c: designware: fix poll-after-enable regression
eeprom: at24: fix retrieving the at24_chip_data structure
i2c: core: ACPI: Log device not acking errors at dbg loglevel
i2c: core: ACPI: Improve OpRegion read errors

MAINTAINERS

···
 S:	Maintained
 F:	arch/alpha/kernel/srm_env.c
 
+ST STM32 I2C/SMBUS DRIVER
+M:	Pierre-Yves MORDRET <[e-mail]>
+L:	[e-mail]
+S:	Maintained
+F:	drivers/i2c/busses/i2c-stm32*
+
 STABLE BRANCH
 M:	Greg Kroah-Hartman <[e-mail]>
 L:	[e-mail]

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

···
 	i2c_dw_disable_int(dev);
 
 	/* Enable the adapter */
-	__i2c_dw_enable_and_wait(dev, true);
+	__i2c_dw_enable(dev, true);
+
+	/* Dummy read to avoid the register getting stuck on Bay Trail */
+	dw_readl(dev, DW_IC_ENABLE_STATUS);
 
 	/* Clear and enable interrupts */
 	dw_readl(dev, DW_IC_CLR_INTR);

drivers/i2c/busses/i2c-pmcmsp.c

···
 		 * TODO: We could potentially loop and retry in the case
 		 * of MSP_TWI_XFER_TIMEOUT.
 		 */
-		return -1;
+		return -EIO;
 	}
 
-	return 0;
+	return num;
 }
 
 static u32 pmcmsptwi_i2c_func(struct i2c_adapter *adapter)

drivers/i2c/busses/i2c-viperboard.c

···
 		}
 		mutex_unlock(&vb->lock);
 	}
-	return 0;
+	return num;
 error:
 	mutex_unlock(&vb->lock);
 	return error;

drivers/i2c/i2c-core-acpi.c

···
 	msgs[1].buf = buffer;
 
 	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
-	if (ret < 0)
-		dev_err(&client->adapter->dev, "i2c read failed\n");
-	else
+	if (ret < 0) {
+		/* Getting a NACK is unfortunately normal with some DSTDs */
+		if (ret == -EREMOTEIO)
+			dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
+				data_len, client->addr, cmd, ret);
+		else
+			dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
+				data_len, client->addr, cmd, ret);
+	} else {
 		memcpy(data, buffer, data_len);
+	}
 
 	kfree(buffer);
 	return ret;

drivers/misc/eeprom/at24.c

···
 	if (of_node && of_match_device(at24_of_match, dev))
 		cdata = of_device_get_match_data(dev);
 	else if (id)
-		cdata = (void *)&id->driver_data;
+		cdata = (void *)id->driver_data;
 	else
 		cdata = acpi_device_get_match_data(dev);