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Basic driver for 8-bit SPI based MCP23S08 GPIO expander, without support for IRQs or the shared chipselect mechanism. Signed-off-by: David Brownell <[email protected]> Cc: Jean Delvare <[email protected]> Cc: Eric Miao <[email protected]> Cc: Sam Ravnborg <[email protected]> Cc: Haavard Skinnemoen <[email protected]> Cc: Philipp Zabel <[email protected]> Cc: Russell King <[email protected]> Cc: Ben Gardner <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>