i2c: add deprecation warning for class based instantiation

Class based instantiation can cause noticeable delays when booting. This
mechanism is used when it is not possible to describe slaves on I2C
busses. As we do have other mechanisms, most embedded I2C will not need
classes and for embedded it is explicitly not recommended to use them. Add
a deprecation warning for drivers which want to disable class based
instantiation in the near future to gain boot-up time, so users relying
on this technique can switch to something better. They really should.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 5fb80b8962a2ad7d8e78dcee01df68cb639d3602..98a5fd950f164dea697b7563a6d02e5cc050ed06 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1941,6 +1941,13 @@ static int i2c_detect_address(struct i2c_client *temp_client,
                struct i2c_client *client;
 
                /* Detection succeeded, instantiate the device */
+               if (adapter->class & I2C_CLASS_DEPRECATED)
+                       dev_warn(&adapter->dev,
+                               "This adapter will soon drop class based instantiation of devices. "
+                               "Please make sure client 0x%02x gets instantiated by other means. "
+                               "Check 'Documentation/i2c/instantiating-devices' for details.\n",
+                               info.addr);
+
                dev_dbg(&adapter->dev, "Creating %s at 0x%02x\n",
                        info.type, info.addr);
                client = i2c_new_device(adapter, &info);

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index deddeb8c337cff2c67d2b9205065741539dbf97c..b556e0ab946fbffd18d246435dc65663e188db54 100644 (file)
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -487,6 +487,7 @@ void i2c_unlock_adapter(struct i2c_adapter *);
 #define I2C_CLASS_HWMON                (1<<0)  /* lm_sensors, ... */
 #define I2C_CLASS_DDC          (1<<3)  /* DDC bus on graphics adapters */
 #define I2C_CLASS_SPD          (1<<7)  /* Memory modules */
+#define I2C_CLASS_DEPRECATED   (1<<8)  /* Warn users that adapter will stop using classes */
 
 /* Internal numbers to terminate lists */
 #define I2C_CLIENT_END         0xfffeU