zephyr: npcx_evb: Enable fan

This CL enables fan functionality for npcx7/9_evb

BUG=none
BRANCH=none
TEST='fanset', 'fanduty', 'faninfo' console command
```
uart:~$ fanset 50%
Fan rpm given as 50%
Setting fan 0 rpm target to 3078
uart:~$ faninfo
Actual: 2943 rpm
Target: 3078 rpm
Duty:   38%
Status: 2 (locked)
Mode:   rpm
Auto:   no
Enable: yes
Power:  yes
```

Signed-off-by: Wealian Liao <whliao@nuvoton.corp-partner.google.com>
Change-Id: I836e1dd62a712bac887d4d12d34541c8c8043a83
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3063105
Reviewed-by: Yuval Peress <peress@chromium.org>
Reviewed-by: Keith Short <keithshort@chromium.org>
Commit-Queue: Keith Short <keithshort@chromium.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/zephyr/projects/npcx_evb/npcx9/fan.dts b/zephyr/projects/npcx_evb/npcx9/fan.dts
new file mode 100644
index 0000000000..de2852d73a
--- /dev/null
+++ b/zephyr/projects/npcx_evb/npcx9/fan.dts
@@ -0,0 +1,29 @@
+/* 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-fans {
+		compatible = "named-fans";
+
+		fan_0 {
+			label = "FAN_0";
+			pwm = <&pwm_fan>;
+			rpm_min = <1000>;
+			rpm_start = <1000>;
+			rpm_max = <5200>;
+			tach = <&tach1>;
+			pgood_gpio = <&gpio_pgood_fan>;
+		};
+	};
+};
+
+/* Tachometer for fan speed measurement */
+&tach1 {
+	status = "okay";
+	pinctrl-0 = <&alt3_ta1_sl1>; /* Use TA1 as input pin */
+	port = <NPCX_TACH_PORT_A>; /* port-A is selected */
+	sample-clk = <NPCX_TACH_FREQ_LFCLK>; /* Use LFCLK as sampling clock */
+	pulses-per-round = <2>; /* number of pulses per round of encoder */
+};