drivers: add NPCX7 cros_kb_raw driver

NPCX keyboard scanning module is supported by up to 18 open-drain
output signals and 8 input signals. Switch-based keyboard matrices are
supported by Schmitt trigger inputs that have internal pull-up
resistors. For power efficiency, the inputs include interrupt and
wake-up capability so that pressing/releasing keys can be identified
without scanning the keyboard matrix in either Active, Sleep or Deep
Sleep power state.

The CL also includes:
— Add npcx cros_kb_raw device tree declarations.
— cros_kb_raw api implementations
- Enable Volteer keyboard scan task

BRANCH=none
BUG=b:167405015, b:172676906
TEST=build pass by zmake configure -B ./build projects/experimental/volteer.
TEST=check all the keys on volteer platform by "ksstate".

Change-Id: I1cbdaa0e81cbb4447daede82774711f4d50f613d
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Wealian Liao <whliao@nuvoton.corp-partner.google.com>
Signed-off-by: Mulin Chao <MLChao@nuvoton.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/zephyr-chrome/+/2523940
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Yuval Peress <peress@chromium.org>
Reviewed-by: Jett Rink <jettrink@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2630148
Tested-by: Jack Rosenthal <jrosenth@chromium.org>

2 files changed, 44 insertions, 0 deletions

diff --git a/zephyr/dts/bindings/cros_kb_raw/cros-kb-raw-controller.yaml b/zephyr/dts/bindings/cros_kb_raw/cros-kb-raw-controller.yaml
new file mode 100644
index 0000000000..e8c95419e1
--- /dev/null
+++ b/zephyr/dts/bindings/cros_kb_raw/cros-kb-raw-controller.yaml
@@ -0,0 +1,12 @@
+# Copyright 2020 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+# Common fields for Chrome OS raw keyboard devices
+
+include: base.yaml
+
+bus: croskb
+
+properties:
+    label:
+      required: true
diff --git a/zephyr/dts/bindings/cros_kb_raw/nuvoton,npcx-cros-kb-raw.yaml b/zephyr/dts/bindings/cros_kb_raw/nuvoton,npcx-cros-kb-raw.yaml
new file mode 100644
index 0000000000..7544039ffc
--- /dev/null
+++ b/zephyr/dts/bindings/cros_kb_raw/nuvoton,npcx-cros-kb-raw.yaml
@@ -0,0 +1,32 @@
+# Copyright 2020 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+description: Nuvoton, NPCX-cros-kb-raw node
+
+compatible: "nuvoton,npcx-cros-kb-raw"
+
+include: cros-kb-raw-controller.yaml
+
+properties:
+    reg:
+        required: true
+
+    clocks:
+        required: true
+
+    pinctrl-0:
+        type: phandles
+        required: true
+        description: configurations of pinmux controllers
+
+    wui_maps:
+        type: phandles
+        required: true
+        description: |
+            Mapping table between Wake-Up Input (WUI) and 8 IOs belong to this device.
+            Please notice not all IOs connect to WUIs.
+
+            In this case, it will be presented by wui_none.
+            For example the WUI mapping on NPCX7 KSI pads would be
+               wui_maps = <&wui_io30 &wui_io31 &wui_io27 &wui_io26
+                           &wui_io25 &wui_io24 &wui_io23 &wui_io22>;