// file：include/dm/uclass.h
/**
* struct uclass - a U-Boot drive class, collecting together similar drivers
*
* A uclass provides an interface to a particular function, which is
* implemented by one or more drivers. Every driver belongs to a uclass even
* if it is the only driver in that uclass. An example uclass is GPIO, which
* provides the ability to change read inputs, set and clear outputs, etc.
* There may be drivers for on-chip SoC GPIO banks, I2C GPIO expanders and
* PMIC IO lines, all made available in a unified way through the uclass.
*
* @priv_: Private data for this uclass (do not access outside driver model)
* @uc_drv: The driver for the uclass itself, not to be confused with a
* 'struct driver'
* @dev_head: List of devices in this uclass (devices are attached to their
* uclass when their bind method is called)
* @sibling_node: Next uclass in the linked list of uclasses
*/
struct uclass {
void *priv_;
struct uclass_driver *uc_drv;
struct list_head dev_head;
struct list_head sibling_node;
};
// file：include/dm/uclass.h
struct uclass_driver {
const char *name;
enum uclass_id id;
int (*post_bind)(struct udevice *dev);
int (*pre_unbind)(struct udevice *dev);
int (*pre_probe)(struct udevice *dev);
int (*post_probe)(struct udevice *dev);
int (*pre_remove)(struct udevice *dev);
int (*child_post_bind)(struct udevice *dev);
int (*child_pre_probe)(struct udevice *dev);
int (*child_post_probe)(struct udevice *dev);
int (*init)(struct uclass *class);
int (*destroy)(struct uclass *class);
int priv_auto;
int per_device_auto;
int per_device_plat_auto;
int per_child_auto;
int per_child_plat_auto;
uint32_t flags;
};
include/thermal.h //温度传感器需要支持的接口（ops）
include/wdt.h //wdt需要支持的ops
include/timer.h //timer需要支持的ops
* include/timer.h
struct timer_ops {
/**
* @get_count: Get the current timer count
*
* @dev: The timer device
*
* This function may be called at any time after the driver is probed.
* All necessary initialization must be completed by the time probe()
* returns. The count returned by this functions should be monotonic.
* This function must succeed.
*
* Return: The current 64-bit timer count
*/
u64 (*get_count)(struct udevice *dev);
};
