1 2 /* FIXME driver should be able to handle IRQs... */ 3 4 struct mcp23s08_chip_info { 5 bool is_present; /* true if populated */ 6 unsigned pullups; /* BIT(x) means enable pullup x */ 7 }; 8 9 struct mcp23s08_platform_data { 10 /* For mcp23s08, up to 4 slaves (numbered 0..3) can share one SPI 11 * chipselect, each providing 1 gpio_chip instance with 8 gpios. 12 * For mpc23s17, up to 8 slaves (numbered 0..7) can share one SPI 13 * chipselect, each providing 1 gpio_chip (port A + port B) with 14 * 16 gpios. 15 */ 16 struct mcp23s08_chip_info chip[8]; 17 18 /* "base" is the number of the first GPIO. Dynamic assignment is 19 * not currently supported, and even if there are gaps in chip 20 * addressing the GPIO numbers are sequential .. so for example 21 * if only slaves 0 and 3 are present, their GPIOs range from 22 * base to base+15 (or base+31 for s17 variant). 23 */ 24 unsigned base; 25 /* Marks the device as a interrupt controller. 26 * NOTE: The interrupt functionality is only supported for i2c 27 * versions of the chips. The spi chips can also do the interrupts, 28 * but this is not supported by the linux driver yet. 29 */ 30 bool irq_controller; 31 32 /* Sets the mirror flag in the IOCON register. Devices 33 * with two interrupt outputs (these are the devices ending with 17 and 34 * those that have 16 IOs) have two IO banks: IO 0-7 form bank 1 and 35 * IO 8-15 are bank 2. These chips have two different interrupt outputs: 36 * One for bank 1 and another for bank 2. If irq-mirror is set, both 37 * interrupts are generated regardless of the bank that an input change 38 * occurred on. If it is not set, the interrupt are only generated for 39 * the bank they belong to. 40 * On devices with only one interrupt output this property is useless. 41 */ 42 bool mirror; 43 }; 44