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