zephyr: npcx: support SHI driver

Add the support for SHI (Serial Host Interface) driver. This is used to
transfer host commands between EC and ARM-based AP.

BUG=b:182600858
BRANCH=none
TEST=Test host command "version" and "Hello" on npcx7_evb and the host
emulator.

Signed-off-by: Jun Lin <CHLin56@nuvoton.com>
Change-Id: I5f290fe910600162764f5728f094dd0f42d508ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2786887
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
Tested-by: Jack Rosenthal <jrosenth@chromium.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/zephyr/dts/bindings/cros_shi/nuvoton,npcx-cros-shi.yaml b/zephyr/dts/bindings/cros_shi/nuvoton,npcx-cros-shi.yaml
new file mode 100644
index 0000000000..cf54cde7f8
--- /dev/null
+++ b/zephyr/dts/bindings/cros_shi/nuvoton,npcx-cros-shi.yaml
@@ -0,0 +1,35 @@
+# Copyright (c) 2021 Google Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Nuvoton, NPCX Serial Host Interface (SHI) node
+
+compatible: "nuvoton,npcx-cros-shi"
+
+include: base.yaml
+
+properties:
+    reg:
+      description: mmio register space
+      required: true
+
+    clocks:
+        required: true
+        description: configurations of device source clock controller
+
+    pinctrl-0:
+        type: phandles
+        required: true
+        description: configurations of pinmux controllers
+
+    ver-ctrl:
+        type: phandle
+        required: true
+        description: configurations of SHI module version
+    shi-cs-wui:
+        type: phandle
+        required: true
+        description: |
+            Mapping table between Wake-Up Input (WUI) and SHI_CS signal.
+
+            For example the WUI mapping on NPCX7 would be
+               shi-cs-wui = <&wui_io53>;