diff --git a/dts/common/yaml/i2c.yaml b/dts/common/yaml/i2c.yaml
index 480631338a6..65b50af72dd 100644
--- a/dts/common/yaml/i2c.yaml
+++ b/dts/common/yaml/i2c.yaml
@@ -18,7 +18,7 @@ properties:
   - clock-frequency :
       type: int
       category: optional
-      description: Maximum I2C bus clock frequency in Hz
+      description: Initial clock frequency in Hz
       generation: define
   - clocks:
       type: array
diff --git a/include/dt-bindings/i2c/i2c.h b/include/dt-bindings/i2c/i2c.h
new file mode 100644
index 00000000000..358fc947096
--- /dev/null
+++ b/include/dt-bindings/i2c/i2c.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2017 Linaro Limited
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef __DT_BINDINGS_I2C_I2C_H
+#define __DT_BINDINGS_I2C_I2C_H
+
+#define I2C_BITRATE_STANDARD	100000	/* 100 Kbit/s */
+#define I2C_BITRATE_FAST	400000	/* 400 Kbit/s */
+#define I2C_BITRATE_FAST_PLUS	1000000 /* 1 Mbit/s */
+#define I2C_BITRATE_HIGH	3400000	/* 3.4 Mbit/s */
+#define I2C_BITRATE_ULTRA	5000000 /* 5 Mbit/s */
+
+#endif /* __DT_BINDINGS_I2C_I2C_H */