i2c
[TOC] i2c-uclass.ci2c_post_bind 扫描并绑定子节点1234567891011static int i2c_post_bind(struct udevice *dev){ int ret = 0; debug("%s: %s, seq=%d\n", __func__, dev->name, dev_seq(dev));#if CONFIG_IS_ENABLED(OF_REAL) ret = dm_scan_fdt_dev(dev);#endif return ret;} i2c_pre_probe 读取u-boot,i2c-transaction-bytes的值12345678910111213141516171819202122static int i2c_pre_probe(struct udevice *dev){#if CONFIG_IS_ENABLED(OF_REAL) struct dm_i2c_bus *i2c = dev_get_uclass_priv(dev); unsigne...
ram
[TOC] ram-uclass.c类信息1234UCLASS_DRIVER(ram) = { .id = UCLASS_RAM, .name = "ram",}; stm32_sdram.c驱动信息123456789U_BOOT_DRIVER(stm32_fmc) = { .name = "stm32_fmc", .id = UCLASS_RAM, .of_match = stm32_fmc_ids, .ops = &stm32_fmc_ops, .of_to_plat = stm32_fmc_of_to_plat, .probe = stm32_fmc_probe, .plat_auto = sizeof(struct stm32_sdram_params),}; dts1234567891011121314151617fmc@52004000 { compatible = "st,stm32h7-fmc"; reg = <0x52004000 ...
pinctrl
[TOC] pinctrl-uclass.cpinctrl_post_bind 以递归方式将其子项绑定为 pinconfig属性的 设备pinctrl_select_state pin选择状态并配置pinctrl_select_state_simple pin选择状态并配置1234567891011121314151617181920212223242526static int pinctrl_select_state_simple(struct udevice *dev){ struct udevice *pctldev; struct pinctrl_ops *ops; int ret; /* * 对于大多数系统，只有一个 pincontroller 设备。但在 * 在多个 pincontroller 设备的情况下，探测序列 * 数字 0（由 alias 定义）以避免争用条件。 */ ret = uclass_get_device_by_seq(UCLASS_PINCTRL, 0, &pctldev); if (ret) /* if not fou...
regulator
[TOC] regulator-uclass.c类信息12345678UCLASS_DRIVER(regulator) = { .id = UCLASS_REGULATOR, .name = "regulator", .post_bind = regulator_post_bind, .pre_probe = regulator_pre_probe, .post_probe = regulator_post_probe, .per_device_plat_auto = sizeof(struct dm_regulator_uclass_plat),}; regulator_post_bind 读取设备属性用于设置设备属性,并检查设备是否是DM设备中唯一的12345678910111213141516171819202122232425262728293031323334static int regulator_post_bind(struct udevice *dev){ struct dm_regulator_uclass...
reset
[TOC] reset-uclass.creset_get_by_index123456789101112int reset_get_by_index(struct udevice *dev, int index, struct reset_ctl *reset_ctl){ struct ofnode_phandle_args args; int ret; //寻找当前节点的`resets`的phandle索引,内容为`#reset-cells`的设备节点 ret = dev_read_phandle_with_args(dev, "resets", "#reset-cells", 0, index, &args); return reset_get_by_index_tail(ret, dev_ofnode(dev), &args, "resets", index > 0, reset_ctl);} reset_get_by...
simple-bus
[TOC] simple-bus驱动信息 在重定向之前调用123456789101112131415161718192021UCLASS_DRIVER(simple_bus) = { .id = UCLASS_SIMPLE_BUS, .name = "simple_bus", .post_bind = simple_bus_post_bind, .per_device_plat_auto = sizeof(struct simple_bus_plat),};#if CONFIG_IS_ENABLED(OF_REAL)static const struct udevice_id generic_simple_bus_ids[] = { { .compatible = "simple-bus" }, { .compatible = "simple-mfd" }, { }};#endifU_BOOT_DRIVER(simpl...
serial
[TOC] serial-uclass.cserial_init 初始化串口 注意DM已初始化完成 serial_init 在relocation前调用 serial_initialize 在relocation后调用 1234567891011121314/* Called after relocation */int serial_initialize(void){ /* Scanning uclass to probe devices */ if (IS_ENABLED(CONFIG_SERIAL_PROBE_ALL)) { int ret; //探测所有的串口设备 ret = uclass_probe_all(UCLASS_SERIAL); if (ret) return ret; } return serial_init();} 123456789101112131415161718192021222324252627282930/* Called prior to relocation */i...
timer
[TOC] timer-uclass.cdm_timer_init 注意到这个函数在多个地方都可以被调; DM扫描识别之后 get_tick和get_tbclk时没有gd->timer的时候 但是只有在gd->timer为空的时候才会执行 12345678910111213141516171819202122232425262728293031323334353637383940int dm_timer_init(void){ struct udevice *dev = NULL; __maybe_unused ofnode node; int ret; if (gd->timer) return 0; if (gd->dm_root == NULL) return -EAGAIN; if (CONFIG_IS_ENABLED(OF_REAL)) { node = ofnode_get_chosen_node("tick-timer"); //优先使用tick-timer节点 if (ofnode_va...
spi
[TOC] spi-uclass.c.post_bind dm_scan_fdt_devspi_child_post_bind 子节点绑定到总线123456789static int spi_child_post_bind(struct udevice *dev){ struct dm_spi_slave_plat *plat = dev_get_parent_plat(dev); if (!dev_has_ofnode(dev)) return 0; return spi_slave_of_to_plat(dev, plat);} spi_slave_of_to_plat 获取spi设备的属性1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374int spi_slave_of_to_plat(struct udevice *dev,...
env
envU_BOOT_ENV_LOCATION 通过该宏定义环境变量的位置 1234567891011121314151617181920/* * Define a callback that can be associated with variables. * when associated through the ".callbacks" environment variable, the callback * will be executed any time the variable is inserted, overwritten, or deleted. * * For SPL these are silently dropped to reduce code size, since environment * callbacks are not supported with SPL. */#ifdef CONFIG_XPL_BUILD#define U_BOOT_ENV_CALLBACK(name, callback) \ static ...
