MUX_PINS_PER_REG  240 drivers/pinctrl/sunxi/pinctrl-sunxi.h 	offset += pin % PINS_PER_BANK / MUX_PINS_PER_REG * 0x04;
MUX_PINS_PER_REG  246 drivers/pinctrl/sunxi/pinctrl-sunxi.h 	u32 pin_num = pin % MUX_PINS_PER_REG;