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