feat[i2c]: add bus configuration and max-hz control

components/drivers/i2c/dev_i2c_core.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2023, RT-Thread Development Team
+ * Copyright (c) 2006-2024, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -7,6 +7,7 @@
  * Date           Author        Notes
  * 2012-04-25     weety         first version
  * 2021-04-20     RiceChen      added support for bus control api
+ * 2024-06-23     wdfk-prog     Add max_hz setting
  */
 
 #include <rtdevice.h>
@@ -101,16 +102,42 @@ rt_err_t rt_i2c_control(struct rt_i2c_bus_device *bus,
 {
     rt_err_t ret;
 
-    if(bus->ops->i2c_bus_control)
+    switch (cmd)
     {
-        ret = bus->ops->i2c_bus_control(bus, cmd, args);
-        return ret;
-    }
-    else
-    {
-        LOG_E("I2C bus operation not supported");
-        return -RT_EINVAL;
+        case RT_I2C_CTRL_SET_MAX_HZ:
+        {
+            if (args == RT_NULL)
+            {
+                return -RT_ERROR;
+            }
+
+            rt_uint32_t max_hz = *(rt_uint32_t *)args;
+            if(max_hz > 0)
+            {
+                bus->config.max_hz = max_hz;
+            }
+            else
+            {
+                return -RT_ERROR;
+            }
+            break;
+        }
+        default:
+        {
+            if(bus->ops->i2c_bus_control)
+            {
+                ret = bus->ops->i2c_bus_control(bus, cmd, args);
+                return ret;
+            }
+            else
+            {
+                LOG_E("I2C bus operation not supported");
+                return -RT_EINVAL;
+            }
+            break;
+        }
     }
+    return RT_EOK;
 }
 
 rt_ssize_t rt_i2c_master_send(struct rt_i2c_bus_device *bus,

components/drivers/include/drivers/dev_i2c.h

@@ -7,6 +7,7 @@
  * Date           Author        Notes
  * 2012-04-25     weety         first version
  * 2021-04-20     RiceChen      added support for bus control api
+ * 2024-06-23     wdfk-prog     Add the config struct
  */
 
 #ifndef __DEV_I2C_H__
@@ -185,6 +186,8 @@ extern "C" {
 #define RT_I2C_NO_READ_ACK      (1u << 6)  /* when I2C reading, we do not ACK */
 #define RT_I2C_NO_STOP          (1u << 7)  /*!< do not generate STOP condition */
 
+#define RT_I2C_CTRL_SET_MAX_HZ  0x20
+
 #define RT_I2C_DEV_CTRL_10BIT        (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x01)
 #define RT_I2C_DEV_CTRL_ADDR         (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x02)
 #define RT_I2C_DEV_CTRL_TIMEOUT      (RT_DEVICE_CTRL_BASE(I2CBUS) + 0x03)
@@ -233,6 +236,21 @@ struct rt_i2c_bus_device_ops
                                 void *args);
 };
 
+/**
+ * I2C configuration structure.
+ * mode : master: 0x00; slave: 0x01;
+ * max_hz: Maximum limit baud rate.
+ * usage_freq: Actual usage baud rate.
+ */
+struct rt_i2c_configuration
+{
+    rt_uint8_t  mode;
+    rt_uint8_t  reserved[3];
+
+    rt_uint32_t max_hz;
+    rt_uint32_t usage_freq;
+};
+
 /**
  * @brief I2C Bus Device
  */
@@ -244,6 +262,7 @@ struct rt_i2c_bus_device
     struct rt_mutex lock;
     rt_uint32_t  timeout;
     rt_uint32_t  retries;
+    struct rt_i2c_configuration config;
     void *priv;
 };