This patch adds ST Keyscan driver to use the keypad hw a subset
of ST boards provide. Specific board setup will be put in the
given dt.

Signed-off-by: Gabriel Fernandez <redacted>
Signed-off-by: Giuseppe Condorelli <redacted>
---
 .../devicetree/bindings/input/st-keyscan.txt       |  60 +++++
 drivers/input/keyboard/Kconfig                     |  12 +
 drivers/input/keyboard/Makefile                    |   1 +
 drivers/input/keyboard/st-keyscan.c                | 260 +++++++++++++++++++++
 4 files changed, 333 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/st-keyscan.txt
 create mode 100644 drivers/input/keyboard/st-keyscan.c

diff --git a/Documentation/devicetree/bindings/input/st-keyscan.txt b/Documentation/devicetree/bindings/input/st-keyscan.txt
new file mode 100644
index 0000000..51eb428
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/st-keyscan.txt

@@ -0,0 +1,60 @@
+* ST Keyscan controller Device Tree bindings
+
+The ST keyscan controller Device Tree binding is based on the
+matrix-keymap.
+
+Required properties:
+- compatible: "st,sti-keyscan"
+
+- reg: Register base address and size of st-keyscan controller.
+
+- interrupts: Interrupt number for the st-keyscan controller.
+
+- clocks: Must contain one entry, for the module clock.
+  See ../clocks/clock-bindings.txt for details.
+
+- pinctrl: Should specify pin control groups used for this controller.
+  See ../pinctrl/pinctrl-bindings.txt for details.
+
+- linux,keymap: The keymap for keys as described in the binding document
+  devicetree/bindings/input/matrix-keymap.txt.
+
+- keypad,num-rows: Number of row lines connected to the keypad controller.
+
+- keypad,num-columns: Number of column lines connected to the keypad
+  controller.
+
+Optional property:
+- st,debounce_us: Debouncing interval time in microseconds