include/linux/spi/mcp23s08.h

   1
   2 /* FIXME driver should be able to handle IRQs...  */
   3
   4 struct mcp23s08_chip_info {
   5         bool            is_present;     /* true if populated */
   6         unsigned        pullups;        /* BIT(x) means enable pullup x */
   7 };
   8
   9 struct mcp23s08_platform_data {
  10         /* For mcp23s08, up to 4 slaves (numbered 0..3) can share one SPI
  11          * chipselect, each providing 1 gpio_chip instance with 8 gpios.
  12          * For mpc23s17, up to 8 slaves (numbered 0..7) can share one SPI
  13          * chipselect, each providing 1 gpio_chip (port A + port B) with
  14          * 16 gpios.
  15          */
  16         struct mcp23s08_chip_info       chip[8];
  17
  18         /* "base" is the number of the first GPIO.  Dynamic assignment is
  19          * not currently supported, and even if there are gaps in chip
  20          * addressing the GPIO numbers are sequential .. so for example
  21          * if only slaves 0 and 3 are present, their GPIOs range from
  22          * base to base+15 (or base+31 for s17 variant).
  23          */
  24         unsigned        base;
  25         /* Marks the device as a interrupt controller.
  26          * NOTE: The interrupt functionality is only supported for i2c
  27          * versions of the chips. The spi chips can also do the interrupts,
  28          * but this is not supported by the linux driver yet.
  29          */
  30         bool            irq_controller;
  31
  32         /* Sets the mirror flag in the IOCON register. Devices
  33          * with two interrupt outputs (these are the devices ending with 17 and
  34          * those that have 16 IOs) have two IO banks: IO 0-7 form bank 1 and
  35          * IO 8-15 are bank 2. These chips have two different interrupt outputs:
  36          * One for bank 1 and another for bank 2. If irq-mirror is set, both
  37          * interrupts are generated regardless of the bank that an input change
  38          * occurred on. If it is not set, the interrupt are only generated for
  39          * the bank they belong to.
  40          * On devices with only one interrupt output this property is useless.
  41          */
  42         bool            mirror;
  43 };