feat(i2c): Support i2c sleep retention on esp32c6/h2

components/soc/include/soc/i2c_periph.h

@@ -1,22 +1,17 @@
-// Copyright 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.
-
+/*
+ * SPDX-FileCopyrightText: 2019-2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 #pragma once
 
 #include "soc/i2c_reg.h"
 #include "soc/i2c_struct.h"
 #include "soc/soc_caps.h"
 #include "soc/periph_defs.h"
+#if SOC_PM_SUPPORT_TOP_PD
+#include "soc/regdma.h"
+#endif
 
 #ifdef __cplusplus
 extern "C" {
@@ -33,6 +28,15 @@ typedef struct {
 
 extern const i2c_signal_conn_t i2c_periph_signal[SOC_I2C_NUM];
 
+#if SOC_PM_SUPPORT_TOP_PD
+typedef struct {
+    const regdma_entries_config_t *link_list;
+    uint32_t link_num;
+} i2c_reg_ctx_link_t;
+
+extern const i2c_reg_ctx_link_t i2c_regs_retention[SOC_I2C_NUM];
+#endif
+
 #ifdef __cplusplus
 }
 #endif

components/soc/include/soc/regdma.h

@@ -44,6 +44,7 @@ extern "C" {
 #define REGDMA_MODEM_BT_BB_LINK(_pri)       ((0x16 << 8) | _pri)
 #define REGDMA_MODEM_IEEE802154_LINK(_pri)  ((0x17 << 8) | _pri)
 #define REGDMA_GDMA_LINK(_pri)              ((0x18 << 8) | _pri)
+#define REGDMA_I2C_LINK(_pri)               ((0x19 << 8) | _pri)
 #define REGDMA_MODEM_FE_LINK(_pri)          ((0xFF << 8) | _pri)
 
 #define REGDMA_LINK_PRI_SYS_CLK                 REGDMA_LINK_PRI_0