u-boot fdt功能和函数
1、接口功能
以下只简单说明几个接口的功能，没有深究到实现原理。先说明几个，后续继续补充。
另外，用节点在dtb中的偏移地址来表示一个节点。也就是节点变量node中，存放的是节点的偏移地址
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lib/fdtdec.c中
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fdt_path_offset
int fdt_path_offset(const void *fdt, const char *path)
eg：node = fdt_path_offset(gd->fdt_blob, “/aliases”);
功能：获得dtb下某个节点的路径path的偏移。这个偏移就代表了这个节点。 -
fdt_getprop
const void *fdt_getprop(const void *fdt, int nodeoffset, const char *name, int *lenp)
eg： mac = fdt_getprop(gd->fdt_blob, node, “mac-address”, &len);
功能：获得节点node的某个字符串属性值。 -
fdtdec_get_int_array、fdtdec_get_byte_array
int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, u32 *array, int count)
eg： ret = fdtdec_get_int_array(blob, node, “interrupts”, cell, ARRAY_SIZE(cell));
功能：获得节点node的某个整形数组属性值。 -
fdtdec_get_addr
fdt_addr_t fdtdec_get_addr(const void *blob, int node, const char *prop_name)
eg：fdtdec_get_addr(blob, node, “reg”);
功能：获得节点node的地址属性值。 -
fdtdec_get_config_int、fdtdec_get_config_bool、fdtdec_get_config_string
功能：获得config节点下的整形属性、bool属性、字符串等等。 -
fdtdec_get_chosen_node
int fdtdec_get_chosen_node(const void *blob, const char *name)
功能：获得chosen下的name节点的偏移 -
fdtdec_get_chosen_prop
const char *fdtdec_get_chosen_prop(const void *blob, const char *name)
功能：获得chosen下name属性的值
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lib/fdtdec_common.c中
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fdtdec_get_int
int fdtdec_get_int(const void *blob, int node, const char *prop_name, int default_val)
eg： bus->udelay = fdtdec_get_int(blob, node, “i2c-gpio,delay-us”, DEFAULT_UDELAY);
功能：获得节点node的某个整形属性值。 -
fdtdec_get_uint
功能：获得节点node的某个无符号整形属性值。
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lib/fdtdec.c中
#define COMPAT(id, name) name static const char * const compat_names[COMPAT_COUNT] = { COMPAT(UNKNOWN, "<none>"), COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"), COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"), COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"), COMPAT(NVIDIA_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"), COMPAT(NVIDIA_TEGRA210_XUSB_PADCTL, "nvidia,tegra210-xusb-padctl"), COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"), COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"), COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"), COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"), COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"), COMPAT(GENERIC_SPI_FLASH, "jedec,spi-nor"), COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"), COMPAT(INTEL_MICROCODE, "intel,microcode"), COMPAT(INTEL_QRK_MRC, "intel,quark-mrc"), COMPAT(ALTERA_SOCFPGA_DWMAC, "altr,socfpga-stmmac"), COMPAT(ALTERA_SOCFPGA_DWMMC, "altr,socfpga-dw-mshc"), COMPAT(ALTERA_SOCFPGA_DWC2USB, "snps,dwc2"), COMPAT(INTEL_BAYTRAIL_FSP, "intel,baytrail-fsp"), COMPAT(INTEL_BAYTRAIL_FSP_MDP, "intel,baytrail-fsp-mdp"), COMPAT(INTEL_IVYBRIDGE_FSP, "intel,ivybridge-fsp"), COMPAT(COMPAT_SUNXI_NAND, "allwinner,sun4i-a10-nand"), COMPAT(ALTERA_SOCFPGA_CLK, "altr,clk-mgr"), COMPAT(ALTERA_SOCFPGA_PINCTRL_SINGLE, "pinctrl-single"), COMPAT(ALTERA_SOCFPGA_H2F_BRG, "altr,socfpga-hps2fpga-bridge"), COMPAT(ALTERA_SOCFPGA_LWH2F_BRG, "altr,socfpga-lwhps2fpga-bridge"), COMPAT(ALTERA_SOCFPGA_F2H_BRG, "altr,socfpga-fpga2hps-bridge"), COMPAT(ALTERA_SOCFPGA_F2SDR0, "altr,socfpga-fpga2sdram0-bridge"), COMPAT(ALTERA_SOCFPGA_F2SDR1, "altr,socfpga-fpga2sdram1-bridge"), COMPAT(ALTERA_SOCFPGA_F2SDR2, "altr,socfpga-fpga2sdram2-bridge"), COMPAT(ALTERA_SOCFPGA_FPGA0, "altr,socfpga-a10-fpga-mgr"), COMPAT(ALTERA_SOCFPGA_NOC, "altr,socfpga-a10-noc"), COMPAT(ALTERA_SOCFPGA_CLK_INIT, "altr,socfpga-a10-clk-init") }; const char *fdtdec_get_compatible(enum fdt_compat_id id) fdt_addr_t fdtdec_get_addr_size_fixed(const void *blob, int node, const char *prop_name, int index, int na, int ns, fdt_size_t *sizep, bool translate) fdt_addr_t fdtdec_get_addr_size_auto_parent(const void *blob, int parent, int node, const char *prop_name, int index, fdt_size_t *sizep, bool translate) fdt_addr_t fdtdec_get_addr_size_auto_noparent(const void *blob, int node, const char *prop_name, int index, fdt_size_t *sizep, bool translate) fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, const char *prop_name, fdt_size_t *sizep) fdt_addr_t fdtdec_get_addr(const void *blob, int node, const char *prop_name) int fdtdec_get_pci_vendev(const void *blob, int node, u16 *vendor, u16 *device) int fdtdec_get_pci_bar32(const struct udevice *dev, struct fdt_pci_addr *addr, u32 *bar) int fdtdec_get_pci_bus_range(const void *blob, int node, struct fdt_resource *res) uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, uint64_t default_val) int fdtdec_get_is_enabled(const void *blob, int node) enum fdt_compat_id fdtdec_lookup(const void *blob, int node) int fdtdec_next_compatible(const void *blob, int node, enum fdt_compat_id id) int fdtdec_next_compatible_subnode(const void *blob, int node, enum fdt_compat_id id, int *depthp) int fdtdec_next_alias(const void *blob, const char *name, enum fdt_compat_id id, int *upto) int fdtdec_find_aliases_for_id(const void *blob, const char *name, enum fdt_compat_id id, int *node_list, int maxcount) int fdtdec_add_aliases_for_id(const void *blob, const char *name, enum fdt_compat_id id, int *node_list, int maxcount) int fdtdec_get_alias_seq(const void *blob, const char *base, int offset, int *seqp) int fdtdec_get_alias_highest_id(const void *blob, const char *base) const char *fdtdec_get_chosen_prop(const void *blob, const char *name) int fdtdec_get_chosen_node(const void *blob, const char *name) int fdtdec_check_fdt(void) int fdtdec_prepare_fdt(void) int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) static const void *get_prop_check_min_len(const void *blob, int node, const char *prop_name, int min_len, int *err) int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, u32 *array, int count) int fdtdec_get_int_array_count(const void *blob, int node, const char *prop_name, u32 *array, int count) const u32 *fdtdec_locate_array(const void *blob, int node, const char *prop_name, int count) int fdtdec_get_bool(const void *blob, int node, const char *prop_name) int fdtdec_parse_phandle_with_args(const void *blob, int src_node, const char *list_name, const char *cells_name, int cell_count, int index, struct fdtdec_phandle_args *out_args) int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, u8 *array, int count) const u8 *fdtdec_locate_byte_array(const void *blob, int node, const char *prop_name, int count) int fdtdec_get_config_int(const void *blob, const char *prop_name, int default_val) int fdtdec_get_config_bool(const void *blob, const char *prop_name) char *fdtdec_get_config_string(const void *blob, const char *prop_name) u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells) int fdt_get_resource(const void *fdt, int node, const char *property, unsigned int index, struct fdt_resource *res) int fdt_get_named_resource(const void *fdt, int node, const char *property, const char *prop_names, const char *name, struct fdt_resource *res) static int decode_timing_property(const void *blob, int node, const char *name, struct timing_entry *result) int fdtdec_decode_display_timing(const void *blob, int parent, int index, struct display_timing *dt) int fdtdec_setup_mem_size_base(void) ofnode get_next_memory_node(ofnode mem) int fdtdec_setup_memory_banksize(void) int fdtdec_setup_mem_size_base_lowest(void) static int uncompress_blob(const void *src, ulong sz_src, void **dstp) static int uncompress_blob(const void *src, ulong sz_src, void **dstp) __weak void *board_fdt_blob_setup(void) int fdtdec_set_ethernet_mac_address(void *fdt, const u8 *mac, size_t size) static int fdtdec_init_reserved_memory(void *blob) int fdtdec_add_reserved_memory(void *blob, const char *basename, const struct fdt_memory *carveout, uint32_t *phandlep, bool no_map) int fdtdec_get_carveout(const void *blob, const char *node, const char *name, unsigned int index, struct fdt_memory *carveout) int fdtdec_set_carveout(void *blob, const char *node, const char *prop_name, unsigned int index, const char *name, const struct fdt_memory *carveout) __weak int fdtdec_board_setup(const void *fdt_blob) int fdtdec_setup(void) int fdtdec_resetup(int *rescan) int fdtdec_decode_ram_size(const void *blob, const char *area, int board_id, phys_addr_t *basep, phys_size_t *sizep, struct bd_info *bd) #endif /* !USE_HOSTCC */
lib/fdtdec_common.c中
int fdtdec_get_int(const void *blob, int node, const char *prop_name, int default_val) unsigned int fdtdec_get_uint(const void *blob, int node, const char *prop_name, unsigned int default_val) int fdtdec_get_child_count(const void *blob, int node)
DECLARE_GLOBAL_DATA_PTR; struct uclass *uclass_find(enum uclass_id key) static int uclass_add(enum uclass_id id, struct uclass **ucp) int uclass_destroy(struct uclass *uc) int uclass_get(enum uclass_id id, struct uclass **ucp) const char *uclass_get_name(enum uclass_id id) void *uclass_get_priv(const struct uclass *uc) void uclass_set_priv(struct uclass *uc, void *priv) enum uclass_id uclass_get_by_name(const char *name) int dev_get_uclass_index(struct udevice *dev, struct uclass **ucp) int uclass_find_device(enum uclass_id id, int index, struct udevice **devp) int uclass_find_first_device(enum uclass_id id, struct udevice **devp) int uclass_find_next_device(struct udevice **devp) int uclass_find_device_by_name(enum uclass_id id, const char *name, struct udevice **devp) int uclass_find_next_free_seq(struct uclass *uc) int uclass_find_device_by_seq(enum uclass_id id, int seq, struct udevice **devp) int uclass_find_device_by_of_offset(enum uclass_id id, int node, struct udevice **devp) int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node, struct udevice **devp) int uclass_find_device_by_phandle(enum uclass_id id, struct udevice *parent, const char *name, struct udevice **devp) int uclass_get_device_by_driver(enum uclass_id id, const struct driver *find_drv, struct udevice **devp) int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp) int uclass_get_device(enum uclass_id id, int index, struct udevice **devp) int uclass_get_device_by_name(enum uclass_id id, const char *name, struct udevice **devp) int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp) int uclass_get_device_by_of_offset(enum uclass_id id, int node, struct udevice **devp) int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node, struct udevice **devp) int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id, struct udevice **devp) int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent, const char *name, struct udevice **devp) int uclass_first_device(enum uclass_id id, struct udevice **devp) int uclass_first_device_err(enum uclass_id id, struct udevice **devp) int uclass_next_device(struct udevice **devp) int uclass_next_device_err(struct udevice **devp) int uclass_first_device_check(enum uclass_id id, struct udevice **devp) int uclass_next_device_check(struct udevice **devp) int uclass_first_device_drvdata(enum uclass_id id, ulong driver_data, struct udevice **devp) int uclass_bind_device(struct udevice *dev) int uclass_unbind_device(struct udevice *dev) int uclass_pre_probe_device(struct udevice *dev) int uclass_post_probe_device(struct udevice *dev) int uclass_pre_remove_device(struct udevice *dev) int uclass_probe_all(enum uclass_id id) UCLASS_DRIVER(nop) = { .id = UCLASS_NOP, .name = "nop", };
DECLARE_GLOBAL_DATA_PTR; static int device_bind_common(struct udevice *parent, const struct driver *drv, const char *name, void *plat, ulong driver_data, ofnode node, uint of_plat_size, struct udevice **devp) int device_bind_with_driver_data(struct udevice *parent, const struct driver *drv, const char *name, ulong driver_data, ofnode node, struct udevice **devp) int device_bind(struct udevice *parent, const struct driver *drv, const char *name, void *plat, ofnode node, struct udevice **devp) int device_bind_by_name(struct udevice *parent, bool pre_reloc_only, const struct driver_info *info, struct udevice **devp) int device_reparent(struct udevice *dev, struct udevice *new_parent) static void *alloc_priv(int size, uint flags) static int device_alloc_priv(struct udevice *dev) int device_of_to_plat(struct udevice *dev) static int device_get_dma_constraints(struct udevice *dev) int device_probe(struct udevice *dev) void *dev_get_plat(const struct udevice *dev) void *dev_get_parent_plat(const struct udevice *dev) void *dev_get_uclass_plat(const struct udevice *dev) void *dev_get_priv(const struct udevice *dev) void *dev_get_uclass_priv(const struct udevice *dev) void *dev_get_parent_priv(const struct udevice *dev) static int device_get_device_tail(struct udevice *dev, int ret, struct udevice **devp) static int device_find_by_ofnode(ofnode node, struct udevice **devp) int device_get_child(const struct udevice *parent, int index, struct udevice **devp) int device_get_child_count(const struct udevice *parent) int device_find_child_by_seq(const struct udevice *parent, int seq, struct udevice **devp) int device_get_child_by_seq(const struct udevice *parent, int seq, struct udevice **devp) int device_find_child_by_of_offset(const struct udevice *parent, int of_offset, struct udevice **devp) int device_get_child_by_of_offset(const struct udevice *parent, int node, struct udevice **devp) static struct udevice *_device_find_global_by_ofnode(struct udevice *parent, ofnode ofnode) int device_find_global_by_ofnode(ofnode ofnode, struct udevice **devp) int device_get_global_by_ofnode(ofnode ofnode, struct udevice **devp) int device_get_by_ofplat_idx(uint idx, struct udevice **devp) int device_find_first_child(const struct udevice *parent, struct udevice **devp) int device_find_next_child(struct udevice **devp) int device_find_first_inactive_child(const struct udevice *parent, enum uclass_id uclass_id, struct udevice **devp) int device_find_first_child_by_uclass(const struct udevice *parent, enum uclass_id uclass_id, struct udevice **devp) int device_find_child_by_name(const struct udevice *parent, const char *name, struct udevice **devp) int device_first_child_err(struct udevice *parent, struct udevice **devp) int device_next_child_err(struct udevice **devp) int device_first_child_ofdata_err(struct udevice *parent, struct udevice **devp) int device_next_child_ofdata_err(struct udevice **devp) struct udevice *dev_get_parent(const struct udevice *child) ulong dev_get_driver_data(const struct udevice *dev) const void *dev_get_driver_ops(const struct udevice *dev) enum uclass_id device_get_uclass_id(const struct udevice *dev) const char *dev_get_uclass_name(const struct udevice *dev) bool device_has_children(const struct udevice *dev) bool device_has_active_children(const struct udevice *dev) bool device_is_last_sibling(const struct udevice *dev) void device_set_name_alloced(struct udevice *dev) int device_set_name(struct udevice *dev, const char *name) void dev_set_priv(struct udevice *dev, void *priv) void dev_set_parent_priv(struct udevice *dev, void *parent_priv) void dev_set_uclass_priv(struct udevice *dev, void *uclass_priv) void dev_set_plat(struct udevice *dev, void *plat) void dev_set_parent_plat(struct udevice *dev, void *parent_plat) void dev_set_uclass_plat(struct udevice *dev, void *uclass_plat) #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) bool device_is_compatible(const struct udevice *dev, const char *compat) bool of_machine_is_compatible(const char *compat) int dev_disable_by_path(const char *path) int dev_enable_by_path(const char *path) static struct udevice_rt *dev_get_rt(const struct udevice *dev) u32 dev_get_flags(const struct udevice *dev) void dev_or_flags(const struct udevice *dev, u32 or) void dev_bic_flags(const struct udevice *dev, u32 bic)
