mcp23s08.h

Go to the documentation of this file.

/* 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;
};