i2c: Deprecate i2c_driver.attach_adapter and .detach_adapter

The last legitimate user of i2c_driver.attach_adapter and
.detach_adapter is gone, so we can finally deprecate these callbacks.
The last few drivers which still use these will have to be updated to
make use of standard I2C device instantiation ways instead.

Signed-off-by: Jean Delvare <khali@linux-fr.org>

2 files changed, 5 insertions, 0 deletions

diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 23ac61e2db39..beee6b2d361d 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_I2C_MUX)		+= i2c-mux.o
 obj-y                           += algos/ busses/ muxes/
 
 ccflags-$(CONFIG_I2C_DEBUG_CORE) := -DDEBUG
+CFLAGS_i2c-core.o := -Wno-deprecated-declarations
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index b9fa1d0320b4..e5f76a0372fd 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -797,6 +797,9 @@ static int i2c_do_add_adapter(struct i2c_driver *driver,
 
         /* Let legacy drivers scan this bus for matching devices */
         if (driver->attach_adapter) {
+                dev_warn(&adap->dev, "attach_adapter method is deprecated\n");
+                dev_warn(&adap->dev, "Please use another way to instantiate "
+                         "your i2c_client\n");
                 /* We ignore the return code; if it fails, too bad */
                 driver->attach_adapter(adap);
         }
@@ -981,6 +984,7 @@ static int i2c_do_del_adapter(struct i2c_driver *driver,
 
         if (!driver->detach_adapter)
                 return 0;
+        dev_warn(&adapter->dev, "detach_adapter method is deprecated\n");
         res = driver->detach_adapter(adapter);
         if (res)
                 dev_err(&adapter->dev, "detach_adapter failed (%d) "