[components][drivers]add ofw support i2c

components/drivers/include/drivers/i2c.h

@@ -63,10 +63,42 @@ struct rt_i2c_bus_device
 
 struct rt_i2c_client
 {
+#ifdef RT_USING_DM
+    struct rt_device parent;
+
+    const char *name;
+    const struct rt_i2c_device_id *id;
+    const struct rt_ofw_node_id *ofw_id;
+#endif
     struct rt_i2c_bus_device       *bus;
     rt_uint16_t                    client_addr;
 };
 
+#ifdef RT_USING_DM
+struct rt_i2c_device_id
+{
+    char name[20];
+    void *data;
+};
+
+struct rt_i2c_driver
+{
+    struct rt_driver parent;
+
+    const struct rt_i2c_device_id *ids;
+    const struct rt_ofw_node_id *ofw_ids;
+
+    rt_err_t (*probe)(struct rt_i2c_client *client);
+    rt_err_t (*remove)(struct rt_i2c_client *client);
+    rt_err_t (*shutdown)(struct rt_i2c_client *client);
+};
+
+rt_err_t rt_i2c_driver_register(struct rt_i2c_driver *driver);
+rt_err_t rt_i2c_device_register(struct rt_i2c_client *client);
+
+#define RT_I2C_DRIVER_EXPORT(driver)  RT_DRIVER_EXPORT(driver, i2c, BUILIN)
+#endif /* RT_USING_DM */
+
 rt_err_t rt_i2c_bus_device_register(struct rt_i2c_bus_device *bus,
                                     const char               *bus_name);
 struct rt_i2c_bus_device *rt_i2c_bus_device_find(const char *bus_name);

components/drivers/include/drivers/i2c_dm.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-11-26     GuEe-GUI     first version
+ */
+
+#ifndef __I2C_DM_H__
+#define __I2C_DM_H__
+
+#include <rthw.h>
+#include <rtthread.h>
+#include <drivers/core/bus.h>
+
+/* I2C Frequency Modes */
+#define I2C_MAX_STANDARD_MODE_FREQ      100000
+#define I2C_MAX_FAST_MODE_FREQ          400000
+#define I2C_MAX_FAST_MODE_PLUS_FREQ     1000000
+#define I2C_MAX_TURBO_MODE_FREQ         1400000
+#define I2C_MAX_HIGH_SPEED_MODE_FREQ    3400000
+#define I2C_MAX_ULTRA_FAST_MODE_FREQ    5000000
+
+struct i2c_timings
+{
+    rt_uint32_t bus_freq_hz; /* the bus frequency in Hz */
+    rt_uint32_t scl_rise_ns; /* time SCL signal takes to rise in ns; t(r) in the I2C specification */
+    rt_uint32_t scl_fall_ns; /* time SCL signal takes to fall in ns; t(f) in the I2C specification */
+    rt_uint32_t scl_int_delay_ns; /* time IP core additionally needs to setup SCL in ns */
+    rt_uint32_t sda_fall_ns; /* time SDA signal takes to fall in ns; t(f) in the I2C specification */
+    rt_uint32_t sda_hold_ns; /* time IP core additionally needs to hold SDA in ns */
+    rt_uint32_t digital_filter_width_ns; /* width in ns of spikes on i2c lines that the IP core digital filter can filter out */
+    rt_uint32_t analog_filter_cutoff_freq_hz; /* threshold frequency for the low pass IP core analog filter */
+};
+
+#ifdef RT_USING_OFW
+rt_err_t i2c_timings_ofw_parse(struct rt_ofw_node *dev_np, struct i2c_timings *timings,
+        rt_bool_t use_defaults);
+#else
+rt_inline rt_err_t i2c_timings_ofw_parse(struct rt_ofw_node *dev_np, struct i2c_timings *timings,
+        rt_bool_t use_defaults)
+{
+    return RT_EOK;
+}
+#endif /* RT_USING_OFW */
+
+void i2c_bus_scan_clients(struct rt_i2c_bus_device *bus);
+
+#endif /* __I2C_DM_H__ */