of_property_read_u8_index(9)

💅 of_property_read_u8_index — like, a whole manual page, but make it make sense

okay so bestie, picture this: it's a Kernel API Manual page, section 9, and it's literally called of_property_read_u8_index. Say that five times fast. No? Same. Anyway — it's giving "find one tiny little u8 hiding inside a multi-value property" energy, and honestly? Iconic. Let me spill. 🎀

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✨ NAME ✨

of_property_read_u8_index — find and read a u8 from a multi-value property. That's it. That's the whole gig. 🦋

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🌸 SYNOPSIS 🌸

int of_property_read_u8_index (const struct device_node *np , const char
*propname , u32 index , u8 *out_value );

look at that signature. she's beautiful. she's int. she takes four arguments. we stan a consistent API. 💜

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🧚 ARGUMENTS 🧚

• np — the device node you're reading the property value from. your source of truth, your main character. 👑
• propname — the name of the property we're searching for. spelling counts, bestie, don't come for me. 🔍
• index — which u8 in the list of values you want. like picking a song out of a playlist, but with bytes. 🎵
• out_value — pointer to the return value. it only gets modified if there's no error, so don't go reading it on faith. 🙈

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🔥 DESCRIPTION 🔥

So what does it actually do? Simple: it searches for a property in a device node and reads the *n*th 8-bit value out of it. Nth. As in the index you passed. Gross but fair.

the out_value girlies, listen up: out_value is modified only if a valid u8 value can be decoded. no valid value? no touchy. she stays untouched. 💅

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⭐ RETURN ⭐

the vibes, in return-code form:

• 0 on success — slay, flawless, no notes 💖
• -EINVAL if the property does not exist — she's not here, ma'am 😭
• -ENODATA if the property does not have a value — exists but empty, the worst kind of person 💀
• -EOVERFLOW if the property data isn't large enough — not enough bytes to go around, tragic, honestly 🫶

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🌈 SEE ALSO 🌈

okay this list is long long, so buckle up, we're doing the whole friend group. the kernel file is ./drivers/of/property.c, and then:

• of_property_read_bool(9)
• of_graph_is_present(9)
• of_property_count_elems_of_size(9)
• of_find_property_value_of_size(9)
• of_property_read_u16_index(9)
• of_property_read_u32_index(9)
• of_property_read_u64_index(9)
• of_property_read_variable_u8_array(9)
• of_property_read_variable_u16_array(9)
• of_property_read_variable_u32_array(9)
• of_property_read_u64(9)
• of_property_read_variable_u64_array(9)
• of_property_read_string(9)
• of_property_match_string(9)
• of_property_read_string_helper(9)
• of_graph_parse_endpoint(9)
• of_graph_get_port_by_id(9)
• of_graph_get_next_port(9)
• of_graph_get_next_port_endpoint(9)
• of_graph_get_next_endpoint(9)
• of_graph_get_endpoint_by_regs(9)
• of_graph_get_remote_endpoint(9)
• of_graph_get_port_parent(9)
• of_graph_get_remote_port_parent(9)
• of_graph_get_remote_port(9)
• of_graph_get_endpoint_count(9)
• of_graph_get_port_count(9)
• of_graph_get_remote_node(9)
• parse_prop_cells(9)
• parse_suffix_prop_cells(9)
• struct supplier_bindings(9)
• of_link_property(9)

like I said. the whole group chat. iykyk. 🧚‍♀️

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ngl bestie, if you only remember one thing: out_value doesn't change unless the decode works. that's the whole safety vibe check. ✨

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and that's the page!! brought to you by ./drivers/of, dated October 2026, and yes, of_property_read_u8_index(9) is the name, it's always been the name, we're literally obsessed with her. mwah. 💋🎀🦋 periodt.