commit 39b03d79f382a81fe827daffd442f306add8b328
author Eren Terzioglu <eren.terzioglu@espressif.com> Mon Sep 15 12:55:47 2025 +0200
committer Matteo Golin <matteo.golin@gmail.com> Wed Oct 01 14:16:55 2025 -0400
tree 29a0b9dffe6d82257c02600d3ed29431879fa026
parent 743b6945607666476c03e050f618574467ae016a

boards/xtensa/esp32[-s2|-s3]: Add RTC I2C board support

Add RTC I2C board support for esp32[-s2|-s3]

Signed-off-by: Eren Terzioglu <eren.terzioglu@espressif.com>

boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_board_i2c.c

diff --git a/boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_board_i2c.c b/boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_board_i2c.c
index 37e909b..e6cfa08 100644
--- a/boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_board_i2c.c
+++ b/boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_board_i2c.c
@@ -42,7 +42,7 @@
 static int i2c_driver_init(int bus)
 {
   struct i2c_master_s *i2c;
-  int ret;
+  int ret = OK;
 
   i2c = esp32s2_i2cbus_initialize(bus);
   if (i2c == NULL)
@@ -51,11 +51,14 @@
       return -ENODEV;
     }
 
-  ret = i2c_register(i2c, bus);
-  if (ret < 0)
+  if (bus != ESP32S2_RTC_I2C)
     {
-      i2cerr("Failed to register I2C%d driver: %d\n", bus, ret);
-      esp32s2_i2cbus_uninitialize(i2c);
+      ret = i2c_register(i2c, bus);
+      if (ret < 0)
+        {
+          i2cerr("Failed to register I2C%d driver: %d\n", bus, ret);
+          esp32s2_i2cbus_uninitialize(i2c);
+        }
     }
 
   return ret;
@@ -89,6 +92,10 @@
 #  ifdef CONFIG_ESP32S2_I2C1_MASTER_MODE
   ret = i2c_driver_init(ESP32S2_I2C1);
 #  endif
+
+#  ifdef CONFIG_ESP32S2_RTC_I2C
+  ret = i2c_driver_init(ESP32S2_RTC_I2C);
+#  endif
 #endif /* #ifdef CONFIG_ESPRESSIF_I2C_PERIPH_MASTER_MODE */
 
 done:

boards/xtensa/esp32s3/common/src/esp32s3_board_i2c.c

diff --git a/boards/xtensa/esp32s3/common/src/esp32s3_board_i2c.c b/boards/xtensa/esp32s3/common/src/esp32s3_board_i2c.c
index 290c14f..6ea5567 100644
--- a/boards/xtensa/esp32s3/common/src/esp32s3_board_i2c.c
+++ b/boards/xtensa/esp32s3/common/src/esp32s3_board_i2c.c
@@ -82,7 +82,7 @@
 static int i2c_driver_init(int bus)
 {
   struct i2c_master_s *i2c;
-  int ret;
+  int ret = OK;
 
   i2c = esp32s3_i2cbus_initialize(bus);
   if (i2c == NULL)
@@ -91,11 +91,14 @@
       return -ENODEV;
     }
 
-  ret = i2c_register(i2c, bus);
-  if (ret < 0)
+  if (bus != ESP32S3_RTC_I2C)
     {
-      i2cerr("Failed to register I2C%d driver: %d\n", bus, ret);
-      esp32s3_i2cbus_uninitialize(i2c);
+      ret = i2c_register(i2c, bus);
+      if (ret < 0)
+        {
+          i2cerr("Failed to register I2C%d driver: %d\n", bus, ret);
+          esp32s3_i2cbus_uninitialize(i2c);
+        }
     }
 
   return ret;
@@ -154,6 +157,10 @@
 #  ifdef CONFIG_ESP32S3_I2C1_MASTER_MODE
   ret = i2c_driver_init(ESP32S3_I2C1);
 #  endif
+
+#  ifdef CONFIG_ESP32S3_RTC_I2C
+  ret = i2c_driver_init(ESP32S3_RTC_I2C);
+#  endif
 #endif
 
 #ifdef CONFIG_ESPRESSIF_I2C_BITBANG