diff options
Diffstat (limited to 'include/linux/spi/mcp23s08.h')
-rw-r--r-- | include/linux/spi/mcp23s08.h | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/include/linux/spi/mcp23s08.h b/include/linux/spi/mcp23s08.h index 22ef107d7704..c42cff8ca191 100644 --- a/include/linux/spi/mcp23s08.h +++ b/include/linux/spi/mcp23s08.h | |||
@@ -2,21 +2,24 @@ | |||
2 | /* FIXME driver should be able to handle IRQs... */ | 2 | /* FIXME driver should be able to handle IRQs... */ |
3 | 3 | ||
4 | struct mcp23s08_chip_info { | 4 | struct mcp23s08_chip_info { |
5 | bool is_present; /* true iff populated */ | 5 | bool is_present; /* true if populated */ |
6 | u8 pullups; /* BIT(x) means enable pullup x */ | 6 | unsigned pullups; /* BIT(x) means enable pullup x */ |
7 | }; | 7 | }; |
8 | 8 | ||
9 | struct mcp23s08_platform_data { | 9 | struct mcp23s08_platform_data { |
10 | /* Four slaves (numbered 0..3) can share one SPI chipselect, and | 10 | /* For mcp23s08, up to 4 slaves (numbered 0..3) can share one SPI |
11 | * will provide 8..32 GPIOs using 1..4 gpio_chip instances. | 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. | ||
12 | */ | 15 | */ |
13 | struct mcp23s08_chip_info chip[4]; | 16 | struct mcp23s08_chip_info chip[8]; |
14 | 17 | ||
15 | /* "base" is the number of the first GPIO. Dynamic assignment is | 18 | /* "base" is the number of the first GPIO. Dynamic assignment is |
16 | * not currently supported, and even if there are gaps in chip | 19 | * not currently supported, and even if there are gaps in chip |
17 | * addressing the GPIO numbers are sequential .. so for example | 20 | * addressing the GPIO numbers are sequential .. so for example |
18 | * if only slaves 0 and 3 are present, their GPIOs range from | 21 | * if only slaves 0 and 3 are present, their GPIOs range from |
19 | * base to base+15. | 22 | * base to base+15 (or base+31 for s17 variant). |
20 | */ | 23 | */ |
21 | unsigned base; | 24 | unsigned base; |
22 | 25 | ||