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e58b9e27 | 1 | |
8f1cc3b1 DB |
2 | /* FIXME driver should be able to handle IRQs... */ |
3 | ||
4 | struct mcp23s08_chip_info { | |
0b7bb77f PK |
5 | bool is_present; /* true if populated */ |
6 | unsigned pullups; /* BIT(x) means enable pullup x */ | |
8f1cc3b1 | 7 | }; |
e58b9e27 DB |
8 | |
9 | struct mcp23s08_platform_data { | |
0b7bb77f PK |
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. | |
8f1cc3b1 | 15 | */ |
0b7bb77f | 16 | struct mcp23s08_chip_info chip[8]; |
e58b9e27 | 17 | |
8f1cc3b1 DB |
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 | |
0b7bb77f | 22 | * base to base+15 (or base+31 for s17 variant). |
8f1cc3b1 | 23 | */ |
e58b9e27 | 24 | unsigned base; |
3af0dbd5 SZ |
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; | |
e58b9e27 | 43 | }; |