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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
e58b9e27 | 2 | struct mcp23s08_platform_data { |
0b7bb77f PK |
3 | /* For mcp23s08, up to 4 slaves (numbered 0..3) can share one SPI |
4 | * chipselect, each providing 1 gpio_chip instance with 8 gpios. | |
5 | * For mpc23s17, up to 8 slaves (numbered 0..7) can share one SPI | |
6 | * chipselect, each providing 1 gpio_chip (port A + port B) with | |
7 | * 16 gpios. | |
8f1cc3b1 | 8 | */ |
ce9bd0a0 | 9 | u32 spi_present_mask; |
e58b9e27 | 10 | |
7f38c5b9 SR |
11 | /* "base" is the number of the first GPIO or -1 for dynamic |
12 | * assignment. If there are gaps in chip addressing the GPIO | |
13 | * numbers are sequential .. so for example if only slaves 0 | |
14 | * and 3 are present, their GPIOs range from base to base+15 | |
15 | * (or base+31 for s17 variant). | |
8f1cc3b1 | 16 | */ |
e58b9e27 | 17 | unsigned base; |
e58b9e27 | 18 | }; |