STRUCT NAND_SUBOP(9)

💖 NAME 💖

Okay so this is the struct nand_subop(9) page from the Kernel API Manual, bestie. And struct nand_subop is literally a sub operation — like a tiny slice of a bigger NAND operation. No cap, it’s giving “small but important” energy.

✨ SYNOPSIS ✨

       struct nand_subop {
           unsigned int cs;
           const struct nand_op_instr *instrs;
           unsigned int ninstrs;
           unsigned int first_instr_start_off;
           unsigned int last_instr_end_off;
        };

🧚 Members 🧚

• cs — the CS line to select for this NAND sub-operation. Like, this is the line-picking field, periodt.
• instrs — array of instructions. The whole lineup of stuff to do.
• ninstrs — length of the instrs array. Yes bestie, it’s giving “how many instructions are in this array.”
• first_instr_start_off — offset to start from for the first instruction of the sub-operation. Lowkey the starting point.
• last_instr_end_off — offset to end at (excluded) for the last instruction of the sub-operation. Important: excluded, okay? Don’t forget 💅

💜 Description 💜

Both first_instr_start_off and last_instr_end_off only apply to data or address instructions. That’s the rule, bestie.

The way this works: when an operation cannot be handled as is by the NAND controller, it will be split by the parser into sub-operations which will be passed to the controller driver. So the parser is basically doing a little choreography 🩰 — chopping the operation into manageable sub-operations and handing them off to the controller driver.

🌈 SEE ALSO 🌈

Kernel file: ./include/linux/mtd/rawnand.h

• struct nand_parameters(9)
• struct nand_id(9)
• struct nand_ecc_step_info(9)
• struct nand_ecc_caps(9)
• struct nand_ecc_ctrl(9)
• struct nand_sdr_timings(9)
• struct nand_nvddr_timings(9)
• enum nand_interface_type(9)
• struct nand_interface_config(9)
• nand_interface_is_sdr(9)
• nand_interface_is_nvddr(9)
• nand_get_sdr_timings(9)
• nand_get_nvddr_timings(9)
• struct nand_op_cmd_instr(9)
• struct nand_op_addr_instr(9)
• struct nand_op_data_instr(9)
• struct nand_op_waitrdy_instr(9)
• enum nand_op_instr_type(9)
• struct nand_op_instr(9)
• struct nand_op_parser_addr_constraints(9)
• struct nand_op_parser_data_constraints(9)
• struct nand_op_parser_pattern_elem(9)
• struct nand_op_parser_pattern(9)
• struct nand_op_parser(9)
• struct nand_operation(9)
• struct nand_controller_ops(9)
• struct nand_controller(9)
• struct nand_legacy(9)
• struct nand_chip_ops(9)
• struct nand_manufacturer(9)
• struct nand_secure_region(9)
• struct nand_chip(9)
• nand_get_interface_config(9)
• struct nand_flash_dev(9)
• nand_opcode_8bits(9)
• nand_get_data_buf(9)

That’s the whole page, bestie 🫶 — from the Kernel API Manual, source ./include/linux/mtd, dated October 2026. Go read your NAND specs and slay 💅✨