esp32s2-saola-1: Add support for I2C chardev driver

Signed-off-by: Gustavo Henrique Nihei <gustavo.nihei@espressif.com>

boards/xtensa/esp32s2/esp32s2-saola-1/configs/i2c/defconfig

@@ -0,0 +1,60 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_ARCH_LEDS is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+# CONFIG_NSH_CMDPARMS is not set
+CONFIG_ARCH="xtensa"
+CONFIG_ARCH_BOARD="esp32s2-saola-1"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_ESP32S2_SAOLA_1=y
+CONFIG_ARCH_CHIP="esp32s2"
+CONFIG_ARCH_CHIP_ESP32S2=y
+CONFIG_ARCH_CHIP_ESP32S2WROVER=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARCH_XTENSA=y
+CONFIG_BOARD_LOOPSPERMSEC=16717
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_ASSERTIONS=y
+CONFIG_DEBUG_ERROR=y
+CONFIG_DEBUG_FEATURES=y
+CONFIG_DEBUG_I2C=y
+CONFIG_DEBUG_I2C_ERROR=y
+CONFIG_DEBUG_I2C_INFO=y
+CONFIG_DEBUG_I2C_WARN=y
+CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_WARN=y
+CONFIG_ESP32S2_I2C0=y
+CONFIG_ESP32S2_I2C1=y
+CONFIG_ESP32S2_UART0=y
+CONFIG_FS_PROCFS=y
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_I2CTOOL_DEFFREQ=100000
+CONFIG_I2CTOOL_MAXBUS=1
+CONFIG_I2C_RESET=y
+CONFIG_I2C_TRACE=y
+CONFIG_IDLETHREAD_STACKSIZE=3072
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INTELHEX_BINARY=y
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_LINELEN=64
+CONFIG_NSH_READLINE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=114688
+CONFIG_RAM_START=0x20000000
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=28
+CONFIG_START_MONTH=6
+CONFIG_START_YEAR=2022
+CONFIG_SYSTEM_I2CTOOL=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_UART0_SERIAL_CONSOLE=y

boards/xtensa/esp32s2/esp32s2-saola-1/src/Make.defs

@@ -41,6 +41,10 @@ ifeq ($(CONFIG_ONESHOT),y)
 CSRCS += esp32s2_oneshot.c
 endif
 
+ifeq ($(CONFIG_I2C_DRIVER),y)
+CSRCS += esp32s2_board_i2c.c
+endif
+
 SCRIPTIN = $(SCRIPTDIR)$(DELIM)esp32s2.template.ld
 SCRIPTOUT = $(SCRIPTDIR)$(DELIM)esp32s2_out.ld
 

boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2-saola-1.h

@@ -117,5 +117,21 @@ int esp32s2_gpio_init(void);
 int board_oneshot_init(int timer, uint16_t resolution);
 #endif
 
+/****************************************************************************
+ * Name: board_i2c_init
+ *
+ * Description:
+ *   Configure the I2C driver.
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; A negated errno value is returned
+ *   to indicate the nature of any failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_I2C_DRIVER
+int board_i2c_init(void);
+#endif
+
 #endif /* __ASSEMBLY__ */
 #endif /* __BOARDS_XTENSA_ESP32S2_ESP32S2_SAOLA_1_SRC_ESP32S2_SAOLA_1_H */

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

@@ -0,0 +1,93 @@
+/****************************************************************************
+ * boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_board_i2c.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+#include <errno.h>
+#include <sys/types.h>
+
+#include <nuttx/i2c/i2c_master.h>
+
+#include "esp32s2_i2c.h"
+#include "esp32s2-saola-1.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+static int i2c_driver_init(int bus)
+{
+  struct i2c_master_s *i2c;
+  int ret;
+
+  i2c = esp32s2_i2cbus_initialize(bus);
+  if (i2c == NULL)
+    {
+      i2cerr("Failed to get I2C%d interface\n", bus);
+      return -ENODEV;
+    }
+
+  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;
+}
+
+/****************************************************************************
+ * Name: board_i2c_init
+ *
+ * Description:
+ *   Configure the I2C driver.
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; A negated errno value is returned
+ *   to indicate the nature of any failure.
+ *
+ ****************************************************************************/
+
+int board_i2c_init(void)
+{
+  int ret = OK;
+
+#ifdef CONFIG_ESP32S2_I2C0
+  ret = i2c_driver_init(ESP32S2_I2C0);
+  if (ret != OK)
+    {
+      goto done;
+    }
+#endif
+
+#ifdef CONFIG_ESP32S2_I2C1
+  ret = i2c_driver_init(ESP32S2_I2C1);
+#endif
+
+done:
+  return ret;
+}
+

boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_bringup.c

@@ -192,6 +192,16 @@ int esp32s2_bringup(void)
 
 #endif /* CONFIG_ONESHOT */
 
+#ifdef CONFIG_I2C_DRIVER
+  /* Configure I2C peripheral interfaces */
+
+  ret = board_i2c_init();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "Failed to initialize I2C driver: %d\n", ret);
+    }
+#endif
+
   /* If we got here then perhaps not all initialization was successful, but
    * at least enough succeeded to bring-up NSH with perhaps reduced
    * capabilities.