feat(esp32h21): support I2C on ESP32H21

components/soc/esp32h21/i2c_periph.c

@@ -0,0 +1,28 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "soc/i2c_periph.h"
+#include "soc/gpio_sig_map.h"
+
+/*
+ Bunch of constants for every I2C peripheral: GPIO signals, irqs, hw addr of registers etc
+*/
+const i2c_signal_conn_t i2c_periph_signal[SOC_I2C_NUM] = {
+    {
+        .sda_out_sig = I2CEXT0_SDA_OUT_IDX,
+        .sda_in_sig = I2CEXT0_SDA_IN_IDX,
+        .scl_out_sig = I2CEXT0_SCL_OUT_IDX,
+        .scl_in_sig = I2CEXT0_SCL_IN_IDX,
+        .irq = ETS_I2C_EXT0_INTR_SOURCE,
+    },
+    {
+        .sda_out_sig = I2CEXT1_SDA_OUT_IDX,
+        .sda_in_sig = I2CEXT1_SDA_IN_IDX,
+        .scl_out_sig = I2CEXT1_SCL_OUT_IDX,
+        .scl_in_sig = I2CEXT1_SCL_IN_IDX,
+        .irq = ETS_I2C_EXT1_INTR_SOURCE,
+    },
+};