i2c: add Kconfig help text for slave mode

I can't recall why there was none, but we surely want to have it.

Signed-off-by: Wolfram Sang <[email protected]>
Reviewed-by: Niklas Söderlund <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

Author: Wolfram Sang

drivers/i2c/Kconfig

@@ -113,6 +113,10 @@ config I2C_STUB
 
 config I2C_SLAVE
 	bool "I2C slave support"
+	help
+	  This enables Linux to act as an I2C slave device. Note that your I2C
+	  bus master driver also needs to support this functionality. Please
+	  read Documentation/i2c/slave-interface.rst for further details.
 
 if I2C_SLAVE