of_property_read_u64_array(9)

💅 of_property_read_u64_array(9) 💅

okay bestie, welcome to the Kernel API Manual — yes that's the manual name, we're in the big-league kernel docs now 🎀 today's main character is of_property_read_u64_array, and she is literally here to find and read an array of 64 bit integers from a property. no cap. 🔥

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✨ NAME ✨

of_property_read_u64_array — Find and read an array of 64 bit integers from a property.

like. that's her whole job description and she ate 💅

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🦋 SYNOPSIS 🦋

int of_property_read_u64_array (const struct device_node *np , const
char *propname , u64 *out_values , size_t sz );

that's the whole signature, character for character, don't come for me 🙈

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🌸 ARGUMENTS 🌸

• np — device node from which the property value is to be read. like, the node we're snooping through 🔍
• propname — name of the property to be searched. the thing we're looking for, iykyk
• out_values — pointer to return value, modified only if return value is 0. big one: she does NOT touch your buffer unless everything went perfectly, periodt 🫶
• sz — number of array elements to read. how many u64s you're asking for, be honest

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💜 DESCRIPTION 💜

Search for a property in a device node and read 64-bit value(s) from it. that's it, that's the vibe check ✨

The out_values is modified only if a valid u64 value can be decoded. so if the decode doesn't work out, your array is untouched — she's not gonna leave you with half-baked garbage in your buffer, that would be so toxic 💀

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👑 RETURN 👑

• 0 — on success 🎉 slay, you got your integers
• -EINVAL — if the property does not exist 😭 she looked everywhere, nothing
• -ENODATA — if property does not have a value 🫠 it's there but it's giving empty
• -EOVERFLOW — if the property data isn't large enough 📏 like, not enough bytes for what you asked for, embarrassing for everyone

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🌈 SEE ALSO 🌈

Kernel file ./include/linux/of.h and honestly the whole friend group:

• of_node_init(9)
• of_machine_is_compatible(9)
• of_parse_phandle(9)
• of_parse_phandle_with_args(9)
• of_parse_phandle_with_fixed_args(9)
• of_parse_phandle_with_optional_args(9)
• of_phandle_args_equal(9)
• of_property_count_u8_elems(9)
• of_property_count_u16_elems(9)
• of_property_count_u32_elems(9)
• of_property_count_u64_elems(9)
• of_property_read_string_array(9)
• of_property_count_strings(9)
• of_property_read_string_index(9)
• of_property_present(9)
• of_property_read_u8_array(9)
• of_property_read_u16_array(9)
• of_property_read_u32_array(9)
• struct of_changeset_entry(9)
• struct of_changeset(9)
• of_device_is_system_power_controller(9)
• of_have_populated_dt(9)

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okay that's the whole page, go forth and read your u64 arrays 💖

source: ./include/linux · date: October 2026 — mwah, that's the sign-off bestie, see u in the next manpage 🎀🦋⭐