18 lines
646 B
C
18 lines
646 B
C
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;
|
|
};
|