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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/spi/mcp23s08.h
2 /* FIXME driver should be able to handle IRQs... */
4 struct mcp23s08_chip_info
{
5 bool is_present
; /* true if populated */
6 unsigned pullups
; /* BIT(x) means enable pullup x */
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
16 struct mcp23s08_chip_info chip
[8];
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).
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.
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.