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authorSonic Zhang <sonic.zhang@analog.com>2014-09-01 07:19:52 +0400
committerLinus Walleij <linus.walleij@linaro.org>2014-09-04 20:59:15 +0400
commit3af0dbd592fe0a92002f16e341519ba03e92adf7 (patch)
tree2e9d28522004ab8a16283fc8cc33d6de13cbdbc6 /include/linux/spi
parent59e22114b253aaa7caf14221df4dcf924d067922 (diff)
downloadlinux-3af0dbd592fe0a92002f16e341519ba03e92adf7.tar.xz
gpio: mcp23s08 to support both device tree and platform data
Device tree is not enabled in some architecture where gpio driver mcp23s08 is still required. v2-changes: - Parse device tree properties into platform data other than individual variables. v3-changes: - Use of_node in gpio_chip device structure, because the struct device * always has an of_node which is NULL when OF is not used. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/linux/spi')
-rw-r--r--include/linux/spi/mcp23s08.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/spi/mcp23s08.h b/include/linux/spi/mcp23s08.h
index 2d676d5aaa89..aa07d7b32568 100644
--- a/include/linux/spi/mcp23s08.h
+++ b/include/linux/spi/mcp23s08.h
@@ -22,4 +22,22 @@ struct mcp23s08_platform_data {
* 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;
};