Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / spi / mcp23s08.h

diff --git a/kernel/include/linux/spi/mcp23s08.h b/kernel/include/linux/spi/mcp23s08.h
new file mode 100644 (file)
index 0000000..aa07d7b
--- /dev/null
+++ b/kernel/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;
+};