sata highbank: add bit-banged SGPIO driver support

Highbank supports SGPIO by bit-banging out the SGPIO signals over
three GPIO pins defined in the DTB. Add support for this SGPIO
functionality.

Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
index b519f9b699c3..3ec0c5c4f0e9 100644
--- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
+++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
@@ -12,6 +12,11 @@ Optional properties:
 - calxeda,port-phys: phandle-combophy and lane assignment, which maps each
                         SATA port to a combophy and a lane within that
                         combophy
+- calxeda,sgpio-gpio: phandle-gpio bank, bit offset, and default on or off,
+                        which indicates that the driver supports SGPIO
+                        indicator lights using the indicated GPIOs
+- calxeda,led-order : a u32 array that map port numbers to offsets within the
+                        SGPIO bitstream.
 - dma-coherent      : Present if dma operations are coherent
 
 Example: