1 files changed, 34 insertions, 0 deletions
diff --git a/include/linux/spi/mcp23s08.h b/include/linux/spi/mcp23s08.h
new file mode 100644
index 00000000..c42cff8c
--- /dev/null
+++ b/include/linux/spi/mcp23s08.h
@@ -0,0 +1,34 @@
+
+/* 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;
+
+	void		*context;	/* param to setup/teardown */
+
+	int		(*setup)(struct spi_device *spi,
+					int gpio, unsigned ngpio,
+					void *context);
+	int		(*teardown)(struct spi_device *spi,
+					int gpio, unsigned ngpio,
+					void *context);
+};