fdt_get_max_phandle(9)

💅 fdt_get_max_phandle(9) ✨

okay so we're in the Kernel API Manual bestie, and today's main character is fdt_get_max_phandle — she finds the biggest phandle in your tree and she does it with attitude 🎀

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🌸 NAME 🌸

fdt_get_max_phandle — retrieves the highest phandle in a tree 🔥

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✨ SYNOPSIS ✨

uint32_t fdt_get_max_phandle (const void *fdt );

like literally that's the whole vibe check, one function, one pointer, no drama 💅

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🦋 ARGUMENTS 🦋

• fdt — pointer to the device tree blob. yes it's a const void *, yes she's mysterious, no we don't ask questions 💜

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💖 DESCRIPTION 💖

okay so fdt_get_max_phandle retrieves the highest phandle in the given device tree. that's the whole job. that's the assignment and she ate 🍓

she's a little picky tho ngl — she will ignore badly formatted phandles, and she also ignores phandles with a value of 0 or -1. not her problem, not her business, she's moving on 🙈

⚠️ bestie listen to me. This function is deprecated in favour of fdt_find_max_phandle. like she still works but she's basically legacy main character energy now — the glow-up is fdt_find_max_phandle and you should go there fr fr 💀

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🌈 RETURN 🌈

• the highest phandle on success 🎉
• 0, if no phandle was found in the device tree 😭
• -1, if an error occurred 💀

note that the return type is uint32_t the whole time — that's just how it is, don't @ me 💅

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👑 SEE ALSO 👑

Kernel file ./scripts/dtc/libfdt/libfdt.h — go read her, she's iconic 📖

and then the extended universe, in the exact order she appears, no cap:

fdt_offset_ptr(9), fdt_next_tag(9), fdt_first_subnode(9), fdt_next_subnode(9), fdt_for_each_subnode(9), fdt_header_size(9), fdt_header_size_(9), fdt_check_header(9), fdt_move(9), fdt_check_full(9), fdt_get_string(9), fdt_string(9), fdt_find_max_phandle(9), fdt_generate_phandle(9), fdt_num_mem_rsv(9), fdt_get_mem_rsv(9), fdt_subnode_offset_namelen(9), fdt_subnode_offset(9), fdt_path_offset_namelen(9), fdt_path_offset(9), fdt_get_name(9), fdt_first_property_offset(9), fdt_next_property_offset(9), fdt_for_each_property_offset(9), fdt_get_property_by_offset(9), fdt_get_property_namelen(9), fdt_get_property(9), fdt_getprop_by_offset(9), fdt_getprop_namelen(9), fdt_getprop(9), fdt_get_phandle(9), fdt_get_alias_namelen(9), fdt_get_alias(9), fdt_get_symbol_namelen(9), fdt_get_symbol(9), fdt_get_path(9), fdt_supernode_atdepth_offset(9), fdt_node_depth(9), fdt_parent_offset(9), fdt_node_offset_by_prop_value(9), fdt_node_offset_by_phandle(9), fdt_node_check_compatible(9), fdt_node_offset_by_compatible(9), fdt_stringlist_contains(9), fdt_stringlist_count(9), fdt_stringlist_search(9), fdt_stringlist_get(9), FDT_MAX_NCELLS(9), fdt_address_cells(9), fdt_size_cells(9), fdt_setprop_inplace_namelen_partial(9), fdt_setprop_inplace(9), fdt_setprop_inplace_u32(9), fdt_setprop_inplace_u64(9), fdt_setprop_inplace_cell(9), fdt_nop_property(9), fdt_nop_node(9), fdt_create_with_flags(9), fdt_create(9), fdt_resize(9), fdt_add_reservemap_entry(9), fdt_finish_reservemap(9), fdt_begin_node(9), fdt_property(9), fdt_property_placeholder(9), fdt_end_node(9), fdt_finish(9), fdt_create_empty_tree(9), fdt_open_into(9), fdt_pack(9), fdt_add_mem_rsv(9), fdt_del_mem_rsv(9), fdt_set_name(9), fdt_setprop_namelen(9), fdt_setprop(9), fdt_setprop_placeholder_namelen(9), fdt_setprop_placeholder(9), fdt_setprop_u32(9), fdt_setprop_u64(9), fdt_setprop_cell(9), fdt_setprop_string(9), fdt_setprop_namelen_string(9), fdt_setprop_empty(9), fdt_appendprop(9), fdt_appendprop_u32(9), fdt_appendprop_u64(9), fdt_appendprop_cell(9), fdt_appendprop_string(9), fdt_appendprop_addrrange(9), fdt_delprop(9), fdt_add_subnode_namelen(9), fdt_add_subnode(9), fdt_del_node(9), fdt_overlay_apply(9), fdt_overlay_target_offset(9), fdt_strerror(9)

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that's the whole page bestie, you're basically an fdt girlie now 🧚‍♀️

sign-off szn 🫶 — this one lives in ./scripts/dtc/libfdt, stamped October 2026, and she serves fdt_get_max_phandle(9) energy from the first line to the last ⭐💜