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Diffstat (limited to 'include/linux/spi/mcp23s08.h')
-rw-r--r--include/linux/spi/mcp23s08.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/spi/mcp23s08.h b/include/linux/spi/mcp23s08.h
new file mode 100644
index 00000000..2d676d5a
--- /dev/null
+++ b/include/linux/spi/mcp23s08.h
@@ -0,0 +1,25 @@
+
+/* 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;
+};