DATA_PINS_PER_REG 255 drivers/pinctrl/sunxi/pinctrl-sunxi.h offset += pin % PINS_PER_BANK / DATA_PINS_PER_REG * 0x04; DATA_PINS_PER_REG 261 drivers/pinctrl/sunxi/pinctrl-sunxi.h u32 pin_num = pin % DATA_PINS_PER_REG;