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