26 lines
871 B
C
26 lines
871 B
C
|
|
/* 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;
|
|
};
|