19 lines
685 B
C
19 lines
685 B
C
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/* SPDX-License-Identifier: GPL-2.0 */
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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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u32 spi_present_mask;
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/* "base" is the number of the first GPIO or -1 for dynamic
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* assignment. If there are gaps in chip addressing the GPIO
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* numbers are sequential .. so for example if only slaves 0
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* and 3 are present, their GPIOs range from base to base+15
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* (or base+31 for s17 variant).
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*/
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unsigned base;
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};
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