0b7bb77fd5
mpc23s17 is very similar to the mcp23s08, except that registers are 16bit wide, so extend the interface to work with both variants. The s17 variant also has an additional address pin, so adjust platform data structure to support up to 8 devices per SPI chipselect. Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
35 lines
1.1 KiB
C
35 lines
1.1 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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void *context; /* param to setup/teardown */
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int (*setup)(struct spi_device *spi,
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int gpio, unsigned ngpio,
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void *context);
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int (*teardown)(struct spi_device *spi,
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int gpio, unsigned ngpio,
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void *context);
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};
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