feature(I2C): Add i2c hal support.

components/soc/esp32/include/soc/i2c_caps.h

@@ -0,0 +1,36 @@
+// Copyright 2010-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ESP32 have 2 I2C.
+#define SOC_I2C_NUM            (2)
+
+#define SOC_I2C_FIFO_LEN       (32) /*!< I2C hardware FIFO depth */
+#define I2C_INTR_MASK          (0x3fff) /*!< I2C all interrupt bitmap */
+
+//ESP32 do not support hardware FSM reset
+#define I2C_SUPPORT_HW_FSM_RST  (0)
+//ESP32 do not support hardware clear bus
+#define I2C_SUPPORT_HW_CLR_BUS  (0)
+
+#ifdef __cplusplus
+}
+#endif
+
+