增加 gpiod_set_value_cansleep.

Signed-off-by: rick.chan <chenyang@autoai.com>

Software/Development/OperatingSystem/Linux/Kernel/API/Linux_Kernel_GPIO_API.md

@@ -1,60 +1,6 @@
 # Linux Kernel GPIO API
 
-## gpiod_direction_output 函数
+## 1. gpiod_get_index 函数
-
-**头文件：**
-
-```cpp
-#include <linux/gpio/consumer.h>
-```
-
-**函数原型：**
-
-```cpp
-int gpiod_direction_output(struct gpio_desc *desc, int value);
-```
-
-**说明：**
-
-Set the direction of the passed GPIO to output, such as gpiod_set_value() can be called safely on it. The initial value of the output must be specified as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into account。
-
-**参数：**
-
-desc：GPIO to set to output；
-
-value：initial output value of the GPIO。
-
-**返回值：**
-
-Return 0 in case of success, else an error code。
-
-## gpiod_direction_input 函数
-
-**头文件：**
-
-```cpp
-#include <linux/gpio/consumer.h>
-```
-
-**函数原型：**
-
-```cpp
-int gpiod_direction_input(struct gpio_desc *desc);
-```
-
-**说明：**
-
-Set the direction of the passed GPIO to input, such as gpiod_get_value() can be called safely on it。
-
-**参数：**
-
-desc：GPIO to set to input。
-
-**返回值：**
-
-Return 0 in case of success, else an error code。
-
-## gpiod_get_index 函数
 
 **头文件：**
 
@@ -89,7 +35,7 @@ flags：optional GPIO initialization flags。
 
 Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the requested function and/or index, or another IS_ERR() code if an error occurred while trying to acquire the GPIO。
 
-## gpiod_get 函数
+## 2. gpiod_get 函数
 
 **头文件：**
 
@@ -120,7 +66,7 @@ flags：optional GPIO initialization flags。
 
 Return the GPIO descriptor corresponding to the function con_id of device dev, -ENOENT if no GPIO has been assigned to the requested function, or another IS_ERR() code if an error occurred while trying to acquire the GPIO。
 
-## gpiod_get_index_optional 函数
+## 3. gpiod_get_index_optional 函数
 
 **头文件：**
 
@@ -154,3 +100,85 @@ flags：optional GPIO initialization flags。
 **返回值：**
 
 This is equivalent to gpiod_get_index(), except that when no GPIO with the specified index was assigned to the requested function it will return NULL。
+
+## 4. gpiod_direction_output 函数
+
+**头文件：**
+
+```cpp
+#include <linux/gpio/consumer.h>
+```
+
+**函数原型：**
+
+```cpp
+int gpiod_direction_output(struct gpio_desc *desc, int value);
+```
+
+**说明：**
+
+Set the direction of the passed GPIO to output, such as gpiod_set_value() can be called safely on it. The initial value of the output must be specified as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into account。
+
+**参数：**
+
+desc：GPIO to set to output；
+
+value：initial output value of the GPIO。
+
+**返回值：**
+
+Return 0 in case of success, else an error code。
+
+## 5. gpiod_direction_input 函数
+
+**头文件：**
+
+```cpp
+#include <linux/gpio/consumer.h>
+```
+
+**函数原型：**
+
+```cpp
+int gpiod_direction_input(struct gpio_desc *desc);
+```
+
+**说明：**
+
+Set the direction of the passed GPIO to input, such as gpiod_get_value() can be called safely on it。
+
+**参数：**
+
+desc：GPIO to set to input。
+
+**返回值：**
+
+Return 0 in case of success, else an error code。
+
+## 6. gpiod_set_value_cansleep 函数
+
+**头文件：**
+
+```cpp
+#include <linux/gpio/consumer.h>
+```
+
+**函数原型：**
+
+```cpp
+void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
+```
+
+**说明：**
+
+Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into account. This function is to be called from contexts that can sleep。
+
+**参数：**
+
+desc：gpio whose value will be assigned；
+
+value：value to assign。
+
+**返回值：**
+
+无