44 lines
1.7 KiB
C
44 lines
1.7 KiB
C
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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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