在看显示模块的代码时看到一个函数devm_gpiod_get_optional(), 之前没接触过,它的调用如下: devm_gpiod_get_optional ->devm_gpiod_get_index_optional->//index为0devm_gpiod_get_index ->gpiod_get_index 可以看到devm_gpiod_get_optional只是对gpiod_
`devm_gpiod_get_optional()` 函数用于在设备模型资源管理框架内,可选地获取一个 GPIO 描述符。它的函数定义如下: c struct gpio_desc *devm_gpiod_get_optional(struct device *dev, const char *con_id, enum gpiod_flags flags); 要使用这个函数,首先需要包含相应的头文件: c include. `#include ` ...
"Das U-Boot" Source Tree with many Tegra 20/30 devices support - usb: dwc3: Use the devm_gpiod_get_optional() API for reset gpio · clamor-s/u-boot@237d1f6
devm_fwnode_get_index_gpiod_from_child() is too long, besides the fwnode in question does not have to be a child of device node. Let's rename it to devm_fwnode_gpiod_get_index() and keep the old name for compatibility for now. Also let's add a devm_fwnode_gpiod_get() wrapper ...
devm_gpiod_get_optional ->devm_gpiod_get_index_optional->//index为0devm_gpiod_get_index ->gpiod_get_index 可以看到devm_gpiod_get_optional只是对gpiod_get_index的包装而已,并且index为0。index参数后面会提。 函数参数: structgpio_desc *__must_check devm_gpiod_get_index(structdevice *dev,co...
JDK8中的optional类 2019-12-23 23:22 −## 一、 案例 ```java @Data public class User { private String name; private int age; } ``` 这里service层的业务逻辑可能返回Null ```java public class UserService {... HeliusKing 0 402
devm_gpiod_get_optional ->devm_gpiod_get_index_optional->//index为0devm_gpiod_get_index ->gpiod_get_index 可以看到devm_gpiod_get_optional只是对gpiod_get_index的包装而已,并且index为0。index参数后面会提。 函数参数: structgpio_desc *__must_check devm_gpiod_get_index(structdevice *dev,co...