I2C/ACPI: Clean up I2C ACPI code and Add CONFIG_I2C_ACPI config

Clean up ACPI related code in the i2c core and add CONFIG_I2C_ACPI
to enable I2C ACPI code.

Current there is a race between removing I2C ACPI operation region
and ACPI AML code accessing. So make i2c core built-in if CONFIG_I2C_ACPI
is set.

Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index f7a939a2cb56..ea507665896c 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -577,10 +577,12 @@ static inline struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node
 }
 #endif /* CONFIG_OF */
 
-#ifdef CONFIG_ACPI
+#ifdef CONFIG_I2C_ACPI
 int acpi_i2c_install_space_handler(struct i2c_adapter *adapter);
 void acpi_i2c_remove_space_handler(struct i2c_adapter *adapter);
+void acpi_i2c_register_devices(struct i2c_adapter *adap);
 #else
+static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) { }
 static inline void acpi_i2c_remove_space_handler(struct i2c_adapter *adapter)
 { }
 static inline int acpi_i2c_install_space_handler(struct i2c_adapter *adapter)