| 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. |
| */ |
| u32 spi_present_mask; |
| |
| /* "base" is the number of the first GPIO or -1 for dynamic |
| * assignment. 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; |
| }; |
