zephyr: npcx_evb: Enable PWM

This CL enables 2 PWM channels for npcx7/9_evb.

BRANCH=none
BUG=none
TEST='pwmduty' console command & check the output waveform is correct.
```
uart:~$ pwmduty
PWM channels:
  0: 50%
  1: 25%
```

Signed-off-by: Wealian Liao <whliao@nuvoton.corp-partner.google.com>
Change-Id: I6fa5d3b7fd3bf1f9d1fdb3f64ca3488ad3addacc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3063104
Reviewed-by: Keith Short <keithshort@chromium.org>
Commit-Queue: Keith Short <keithshort@chromium.org>

8 files changed, 104 insertions, 0 deletions

diff --git a/zephyr/projects/npcx_evb/npcx7/include/pwm_map.h b/zephyr/projects/npcx_evb/npcx7/include/pwm_map.h
new file mode 100644
index 0000000000..371e95c116
--- /dev/null
+++ b/zephyr/projects/npcx_evb/npcx7/include/pwm_map.h
@@ -0,0 +1,16 @@
+/* Copyright 2021 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef __ZEPHYR_PWM_MAP_H
+#define __ZEPHYR_PWM_MAP_H
+
+#include <devicetree.h>
+
+#include "pwm/pwm.h"
+
+#define PWM_CH_FAN		NAMED_PWM(fan)
+#define PWM_CH_KBLIGHT		NAMED_PWM(kblight)
+
+#endif /* __ZEPHYR_PWM_MAP_H */
diff --git a/zephyr/projects/npcx_evb/npcx7/prj.conf b/zephyr/projects/npcx_evb/npcx7/prj.conf
index 16a01208e9..4b49332a6d 100644
--- a/zephyr/projects/npcx_evb/npcx7/prj.conf
+++ b/zephyr/projects/npcx_evb/npcx7/prj.conf
@@ -21,6 +21,9 @@ CONFIG_PLATFORM_EC_VSTORE=n
 # Board version is selected over GPIO board ID pins.
 CONFIG_PLATFORM_EC_BOARD_VERSION_GPIO=y
 
+# PWM
+CONFIG_PLATFORM_EC_PWM=y
+
 # Zephyr feature
 CONFIG_ASSERT=y
 CONFIG_SHELL_MINIMAL=n
diff --git a/zephyr/projects/npcx_evb/npcx7/pwm.dts b/zephyr/projects/npcx_evb/npcx7/pwm.dts
new file mode 100644
index 0000000000..3b7b88c235
--- /dev/null
+++ b/zephyr/projects/npcx_evb/npcx7/pwm.dts
@@ -0,0 +1,32 @@
+/* Copyright 2021 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/ {
+	named-pwms {
+		compatible = "named-pwms";
+
+		fan {
+			pwms = <&pwm0 0 0>;
+			label = "FAN";
+			frequency = <25000>;
+		};
+		kblight {
+			pwms = <&pwm2 0 0>;
+			label = "KBLIGHT";
+			frequency = <10000>;
+		};
+	};
+};
+
+/* fan */
+&pwm0 {
+	status = "okay";
+	drive-open-drain;
+};
+
+/* kblight */
+&pwm2 {
+	status = "okay";
+};
diff --git a/zephyr/projects/npcx_evb/npcx7/zmake.yaml b/zephyr/projects/npcx_evb/npcx7/zmake.yaml
index 10cb8dffb7..710e0a7568 100644
--- a/zephyr/projects/npcx_evb/npcx7/zmake.yaml
+++ b/zephyr/projects/npcx_evb/npcx7/zmake.yaml
@@ -5,6 +5,7 @@
 board: npcx7_evb
 dts-overlays:
   - gpio.dts
+  - pwm.dts
 supported-zephyr-versions:
   - v2.6
 toolchain: coreboot-sdk
diff --git a/zephyr/projects/npcx_evb/npcx9/include/pwm_map.h b/zephyr/projects/npcx_evb/npcx9/include/pwm_map.h
new file mode 100644
index 0000000000..371e95c116
--- /dev/null
+++ b/zephyr/projects/npcx_evb/npcx9/include/pwm_map.h
@@ -0,0 +1,16 @@
+/* Copyright 2021 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef __ZEPHYR_PWM_MAP_H
+#define __ZEPHYR_PWM_MAP_H
+
+#include <devicetree.h>
+
+#include "pwm/pwm.h"
+
+#define PWM_CH_FAN		NAMED_PWM(fan)
+#define PWM_CH_KBLIGHT		NAMED_PWM(kblight)
+
+#endif /* __ZEPHYR_PWM_MAP_H */
diff --git a/zephyr/projects/npcx_evb/npcx9/prj.conf b/zephyr/projects/npcx_evb/npcx9/prj.conf
index 98474940ba..e124930bfc 100644
--- a/zephyr/projects/npcx_evb/npcx9/prj.conf
+++ b/zephyr/projects/npcx_evb/npcx9/prj.conf
@@ -25,6 +25,9 @@ CONFIG_PLATFORM_EC_WORKAROUND_FLASH_DOWNLOAD_API=y
 # Board version is selected over GPIO board ID pins.
 CONFIG_PLATFORM_EC_BOARD_VERSION_GPIO=y
 
+# PWM
+CONFIG_PLATFORM_EC_PWM=y
+
 # Zephyr feature
 CONFIG_ASSERT=y
 CONFIG_SHELL_MINIMAL=n
diff --git a/zephyr/projects/npcx_evb/npcx9/pwm.dts b/zephyr/projects/npcx_evb/npcx9/pwm.dts
new file mode 100644
index 0000000000..3b7b88c235
--- /dev/null
+++ b/zephyr/projects/npcx_evb/npcx9/pwm.dts
@@ -0,0 +1,32 @@
+/* Copyright 2021 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/ {
+	named-pwms {
+		compatible = "named-pwms";
+
+		fan {
+			pwms = <&pwm0 0 0>;
+			label = "FAN";
+			frequency = <25000>;
+		};
+		kblight {
+			pwms = <&pwm2 0 0>;
+			label = "KBLIGHT";
+			frequency = <10000>;
+		};
+	};
+};
+
+/* fan */
+&pwm0 {
+	status = "okay";
+	drive-open-drain;
+};
+
+/* kblight */
+&pwm2 {
+	status = "okay";
+};
diff --git a/zephyr/projects/npcx_evb/npcx9/zmake.yaml b/zephyr/projects/npcx_evb/npcx9/zmake.yaml
index 5aaa630542..29443aba14 100644
--- a/zephyr/projects/npcx_evb/npcx9/zmake.yaml
+++ b/zephyr/projects/npcx_evb/npcx9/zmake.yaml
@@ -5,6 +5,7 @@
 board: npcx9_evb
 dts-overlays:
   - gpio.dts
+  - pwm.dts
 supported-zephyr-versions:
   - v2.6
 toolchain: coreboot-sdk