Input: add TI-Nspire keypad support

This is a driver for the keypads found on the TI-Nspire series calculators.

Signed-off-by: Daniel Tang <dt.tangr@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/ti,nspire-keypad.txt b/Documentation/devicetree/bindings/input/ti,nspire-keypad.txt
new file mode 100644
index 000000000000..513d94d6e899
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/ti,nspire-keypad.txt
@@ -0,0 +1,60 @@
+TI-NSPIRE Keypad
+
+Required properties:
+- compatible: Compatible property value should be "ti,nspire-keypad".
+
+- reg: Physical base address of the peripheral and length of memory mapped
+  region.
+
+- interrupts: The interrupt number for the peripheral.
+
+- scan-interval: How often to scan in us. Based on a APB speed of 33MHz, the
+        maximum and minimum delay time is ~2000us and ~500us respectively
+
+- row-delay: How long to wait before scanning each row.
+
+- clocks: The clock this peripheral is attached to.
+
+- linux,keymap: The keymap to use
+        (see Documentation/devicetree/bindings/input/matrix-keymap.txt)
+
+Optional properties:
+- active-low: Specify that the keypad is active low (i.e. logical low signifies
+        a key press).
+
+Example:
+
+input {
+        compatible = "ti,nspire-keypad";
+        reg = <0x900E0000 0x1000>;
+        interrupts = <16>;
+
+        scan-interval = <1000>;
+        row-delay = <200>;
+
+        clocks = <&apb_pclk>;
+
+        linux,keymap = <
+        0x0000001c      0x0001001c      0x00040039
+        0x0005002c      0x00060015      0x0007000b
+        0x0008000f      0x0100002d      0x01010011
+        0x0102002f      0x01030004      0x01040016
+        0x01050014      0x0106001f      0x01070002
+        0x010a006a      0x02000013      0x02010010
+        0x02020019      0x02030007      0x02040018
+        0x02050031      0x02060032      0x02070005
+        0x02080028      0x0209006c      0x03000026
+        0x03010025      0x03020024      0x0303000a
+        0x03040017      0x03050023      0x03060022
+        0x03070008      0x03080035      0x03090069
+        0x04000021      0x04010012      0x04020020
+        0x0404002e      0x04050030      0x0406001e
+        0x0407000d      0x04080037      0x04090067
+        0x05010038      0x0502000c      0x0503001b
+        0x05040034      0x0505001a      0x05060006
+        0x05080027      0x0509000e      0x050a006f
+        0x0600002b      0x0602004e      0x06030068
+        0x06040003      0x0605006d      0x06060009
+        0x06070001      0x0609000f      0x0708002a
+        0x0709001d      0x070a0033      >;
+};