[gd32][i2c] Add GD32VW553xx hardware I2C driver

bsp/gd32/risc-v/gd32vw553h-eval/.ci/attachconfig/ci.attachconfig.yml

@@ -6,4 +6,15 @@ scons.args: &scons
 component.pwm:
     kconfig:
       - CONFIG_BSP_USING_PWM=y
-      - CONFIG_BSP_USING_PWM0=y
+      - CONFIG_BSP_USING_PWM0=y
+
+# ------ devices ------
+devices.i2c:
+    kconfig:
+      - CONFIG_BSP_USING_HW_I2C=y
+      - CONFIG_BSP_USING_HW_I2C0=y
+      - CONFIG_BSP_HW_I2C0_PIN_PA2_PA3=y
+      - CONFIG_BSP_HW_I2C0_CLK=100
+      - CONFIG_BSP_USING_HW_I2C1=y
+      - CONFIG_BSP_HW_I2C1_PIN_PB12_PB13=y
+      - CONFIG_BSP_HW_I2C1_CLK=100

bsp/gd32/risc-v/gd32vw553h-eval/board/Kconfig

@@ -79,8 +79,63 @@ menu "On-chip Peripheral Drivers"
                 bool "Enable PWM16"
                 default n
         endif
+    menuconfig BSP_USING_HW_I2C
+        bool "Enable Hardware I2C"
+        default n
+        select RT_USING_I2C
+        if BSP_USING_HW_I2C
+            config BSP_USING_HW_I2C0
+                bool "Enable Hardware I2C0"
+                default n
 
+            # config i2c0 pins
+            choice
+                prompt "Select I2C0 pins"
+                depends on BSP_USING_HW_I2C0
+                config BSP_HW_I2C0_PIN_PA2_PA3
+                    bool "SCL=PA2,  SDA=PA3"
+                config BSP_HW_I2C0_PIN_PA15_PC8
+                    bool "SCL=PA15, SDA=PC8"
+                config BSP_HW_I2C0_PIN_PB0_PB1
+                    bool "SCL=PB0,  SDA=PB1"
+                config BSP_HW_I2C0_PIN_PB15_PA8
+                    bool "SCL=PB15, SDA=PA8"
+            endchoice
 
+            # config i2c0 clock
+            config BSP_HW_I2C0_CLK
+                int "I2C0 clock frequency(KHz)"
+                default 100
+                depends on BSP_USING_HW_I2C0
+                range 10 1000
+
+            config BSP_USING_HW_I2C1
+                bool "Enable Hardware I2C1"
+                default n
+
+            # config i2c1 pins
+            choice
+                prompt "Select I2C1 pins"
+                depends on BSP_USING_HW_I2C1
+                config BSP_HW_I2C1_PIN_PA6_PA7
+                    bool "SCL=PA6,  SDA=PA7"
+                config BSP_HW_I2C1_PIN_PA13_PA14
+                    bool "SCL=PA13, SDA=PA14"
+                config BSP_HW_I2C1_PIN_PA15_PC8
+                    bool "SCL=PA15, SDA=PC8"
+                config BSP_HW_I2C1_PIN_PB12_PB13
+                    bool "SCL=PB12, SDA=PB13"
+                config BSP_HW_I2C1_PIN_PB15_PA8
+                    bool "SCL=PB15, SDA=PA8"
+            endchoice
+
+            # config i2c1 clock
+            config BSP_HW_I2C1_CLK
+                int "I2C1 clock frequency(KHz)"
+                default 100
+                depends on BSP_USING_HW_I2C1
+                range 10 1000
+        endif
 
     source "$(BSP_DIR)/../libraries/gd32_drivers/Kconfig"
 

bsp/gd32/risc-v/libraries/gd32_drivers/SConscript

@@ -20,6 +20,9 @@ if GetDepend(['RT_USING_SERIAL']):
 if GetDepend(['RT_USING_I2C', 'RT_USING_I2C_BITOPS']):
     if GetDepend('BSP_USING_I2C0') or GetDepend('BSP_USING_I2C1') or GetDepend('BSP_USING_I2C2') or GetDepend('BSP_USING_I2C3'):
         src += ['drv_soft_i2c.c']
+if GetDepend(['RT_USING_I2C', 'BSP_USING_HW_I2C']):
+    if GetDepend('BSP_USING_HW_I2C0') or GetDepend('BSP_USING_HW_I2C1'):
+        src += ['drv_i2c.c']
 
 # add spi drivers.
 if GetDepend('RT_USING_SPI'):

bsp/gd32/risc-v/libraries/gd32_drivers/drv_i2c.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2006-2026, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2026-01-13     yefeng       first implementation.
+ */
+
+#ifndef __DRV_I2C_H__
+#define __DRV_I2C_H__
+
+#include <rtthread.h>
+#include <rtdevice.h>
+#include <rthw.h>
+#include <board.h>
+
+struct gd32_i2c_config
+{
+    const char *name;
+    rt_uint32_t i2c_periph;
+    rcu_periph_enum rcu_clk;
+    rt_uint32_t speed;
+};
+
+struct gd32_i2c_device
+{
+    struct rt_i2c_bus_device parent;
+    struct gd32_i2c_config *config;
+};
+
+#endif