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/* SPDX-License-Identifier: GPL-2.0 */
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.
	 */
	u32 spi_present_mask;

	/* "base" is the number of the first GPIO or -1 for dynamic
	 * assignment. 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;
};