STRUCT REGMAP_RANGE_CFG(9)

💅 struct regmap_range_cfg(9) 💅

okay bestie, welcome to the Kernel API Manual — this is the group-chat explainer for struct regmap_range_cfg(9), and it’s giving “configuration for indirectly accessed or paged registers” energy. no cap. 🦋

🌸 NAME 🌸

struct regmap_range_cfg — configuration for indirectly accessed or paged registers. that’s the main character energy of this page: it’s the config struct for registers you reach indirectly, or in pages. periodt. 💖

✨ SYNOPSIS ✨

struct regmap_range_cfg {
    const char *name;
    unsigned int range_min;
    unsigned int range_max;
    unsigned int selector_reg;
    unsigned int selector_mask;
    int selector_shift;
    unsigned int window_start;
    unsigned int window_len;
        };

🎀 Members 🎀

• name — descriptive name for diagnostics. your little label for when diagnostics need to know who’s who. 🔍
• range_min — address of the lowest register address in virtual range. the bottom edge of the virtual-range situation.
• range_max — address of the highest register in virtual range. the top edge, bestie.
• selector_reg — register with selector field. yep, the register that holds the selector field.
• selector_mask — bit mask for selector value. masking, but make it cute. 🎭
• selector_shift — bit shift for selector value. shifting bits like it’s a whole vibe.
• window_start — address of first (lowest) register in data window. the first/lowest one in the data window.
• window_len — number of registers in data window. literally the count of registers in that data window. 🔢

🧚 DESCRIPTION 🧚

registers, mapped to this virtual range, are accessed in two steps:

1. page selector register update;
2. access through data window registers.

lowkey iconic: first the page selector register gets updated, then you access through the data window registers. that’s the two-step. no extra lore, fr fr. 🌈

👑 SEE ALSO 👑

Kernel file ./include/linux/regmap.h — plus the whole see-also squad: struct reg_default(9), struct reg_sequence(9), regmap_read_poll_timeout(9), regmap_read_poll_timeout_atomic(9), regmap_field_read_poll_timeout(9), struct regmap_range(9), struct regmap_access_table(9), struct regmap_config(9), struct regmap_sdw_mbq_cfg(9), struct regmap_bus(9), regmap_init(9), regmap_init_i2c(9), regmap_init_mdio(9), regmap_init_sccb(9), regmap_init_slimbus(9), regmap_init_spi(9), regmap_init_spmi_base(9), regmap_init_spmi_ext(9), regmap_init_w1(9), regmap_init_mmio_clk(9), regmap_init_mmio(9), regmap_init_ac97(9), regmap_init_sdw(9), regmap_init_sdw_mbq(9), regmap_init_sdw_mbq_cfg(9), regmap_init_i3c(9), regmap_init_spi_avmm(9), regmap_init_fsi(9), devm_regmap_init(9), devm_regmap_init_i2c(9), devm_regmap_init_mdio(9), devm_regmap_init_sccb(9), devm_regmap_init_spi(9), devm_regmap_init_spmi_base(9), devm_regmap_init_spmi_ext(9), devm_regmap_init_w1(9), devm_regmap_init_mmio_clk(9), devm_regmap_init_mmio(9), devm_regmap_init_ac97(9), devm_regmap_init_sdw(9), devm_regmap_init_sdw_mbq(9), devm_regmap_init_sdw_mbq_cfg(9), devm_regmap_init_slimbus(9), devm_regmap_init_i3c(9), devm_regmap_init_spi_avmm(9), devm_regmap_init_fsi(9), struct reg_field(9), struct regmap_irq_type(9), struct regmap_irq(9), struct regmap_irq_chip(9)

mwah 💋 — from ./include/linux, October 2026, with the struct regmap_range_cfg(9) page. 🎀