1 files changed, 43 insertions, 0 deletions
diff --git a/include/linux/spi/mcp23s08.h b/include/linux/spi/mcp23s08.h
new file mode 100644
index 000000000..aa07d7b32
--- /dev/null
+++ b/include/linux/spi/mcp23s08.h
@@ -0,0 +1,43 @@
+
+/* 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;
+	/* Marks the device as a interrupt controller.
+	 * NOTE: The interrupt functionality is only supported for i2c
+	 * versions of the chips. The spi chips can also do the interrupts,
+	 * but this is not supported by the linux driver yet.
+	 */
+	bool		irq_controller;
+
+	/* Sets the mirror flag in the IOCON register. Devices
+	 * with two interrupt outputs (these are the devices ending with 17 and
+	 * those that have 16 IOs) have two IO banks: IO 0-7 form bank 1 and
+	 * IO 8-15 are bank 2. These chips have two different interrupt outputs:
+	 * One for bank 1 and another for bank 2. If irq-mirror is set, both
+	 * interrupts are generated regardless of the bank that an input change
+	 * occurred on. If it is not set, the interrupt are only generated for
+	 * the bank they belong to.
+	 * On devices with only one interrupt output this property is useless.
+	 */
+	bool		mirror;
+};