mfd: Attaching a node to new 'struct mfd_cell' of_compatible variable

Applying a succinct description to the of_compatible variable recently
added to the mfd_cell struct. Also link to the documentation page where
more information can be found about compatible properties.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
index 99b7eb1..3a8435a 100644
--- a/include/linux/mfd/core.h
+++ b/include/linux/mfd/core.h
@@ -36,6 +36,10 @@
 	/* platform data passed to the sub devices drivers */
 	void			*platform_data;
 	size_t			pdata_size;
+	/*
+	 * Device Tree compatible string
+	 * See: Documentation/devicetree/usage-model.txt Chapter 2.2 for details
+	 */
 	const char		*of_compatible;
 
 	/*