boards/esp32c3-devkit: Add SPI character device driver

boards/risc-v/esp32c3/esp32c3-devkit/src/Makefile

@@ -46,6 +46,10 @@ ifeq ($(CONFIG_ESP32C3_SPI),y)
 CSRCS += esp32c3_board_spi.c
 endif
 
+ifeq ($(CONFIG_SPI_DRIVER),y)
+CSRCS += esp32c3_board_spidev.c
+endif
+
 ifeq ($(CONFIG_I2C_DRIVER),y)
 CSRCS += esp32c3_i2c.c
 endif

boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3-devkit.h

@@ -95,6 +95,25 @@ int esp32c3_gpio_init(void);
 int board_wdt_init(void);
 #endif
 
+/****************************************************************************
+ * Name: board_spidev_initialize
+ *
+ * Description:
+ *   Initialize SPI driver and register the /dev/spi device.
+ *
+ * Input Parameters:
+ *   bus - The SPI bus number, used to build the device path as /dev/spiN
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; A negated errno value is returned
+ *   to indicate the nature of any failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SPI_DRIVER
+int board_spidev_initialize(int bus);
+#endif
+
 /****************************************************************************
  * Name: board_i2c_init
  *
@@ -106,6 +125,7 @@ int board_wdt_init(void);
  *   to indicate the nature of any failure.
  *
  ****************************************************************************/
+
 #ifdef CONFIG_I2C_DRIVER
 int board_i2c_init(void);
 #endif
@@ -154,6 +174,7 @@ int board_bmp180_initialize(int devno, int busno);
  *
  * Description:
  *   Initialize the SPIFLASH and register the MTD device.
+ *
  ****************************************************************************/
 
 #ifdef CONFIG_ESP32C3_SPIFLASH

boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3_board_spidev.c

@@ -0,0 +1,72 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3_board_spidev.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 <stdio.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/spi/spi_transfer.h>
+
+#include "esp32c3_spi.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_spidev_initialize
+ *
+ * Description:
+ *   Initialize and register SPI driver for the specified SPI port.
+ *
+ ****************************************************************************/
+
+int board_spidev_initialize(int port)
+{
+  int ret;
+  FAR struct spi_dev_s *spi;
+
+  syslog(LOG_INFO, "Initializing /dev/spi%d...\n", port);
+
+  /* Initialize SPI device */
+
+  spi = esp32c3_spibus_initialize(port);
+  if (spi == NULL)
+    {
+      syslog(LOG_ERR, "Failed to initialize SPI%d.\n", port);
+      return -ENODEV;
+    }
+
+  ret = spi_register(spi, port);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "Failed to register /dev/spi%d: %d\n", port, ret);
+
+      esp32c3_spibus_uninitialize(spi);
+    }
+
+  return ret;
+}

boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3_bringup.c

@@ -42,6 +42,10 @@
 #include "esp32c3_partition.h"
 #include "esp32c3-devkit.h"
 
+#ifdef CONFIG_SPI_DRIVER
+#  include "esp32c3_spi.h"
+#endif
+
 #ifdef CONFIG_TIMER
 #  include "esp32c3_tim_lowerhalf.h"
 #endif
@@ -161,6 +165,15 @@ int esp32c3_bringup(void)
     }
 #endif
 
+#if defined(CONFIG_SPI_DRIVER) && defined(CONFIG_ESP32C3_SPI2)
+  ret = board_spidev_initialize(ESP32C3_SPI2);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "Failed to initialize SPI%d driver: %d\n",
+             ESP32C3_SPI2, ret);
+    }
+#endif
+
 #if defined(CONFIG_I2C_DRIVER)
   /* Configure I2C peripheral interfaces */