[PATCH] realtek: hpe 1920-48-poe jg928a: add fan control

[Evan Jobling]

JG928A has an rtl8231 on the alt mdio bus.
Add it to device tree.
Add fan gpio and alarm to device tree.
Add hwmon kernel module to image.

Known issues:
Due to
3810e897295cb66bc45a62bc2c0b70a01004fe3b
"realtek: ensure output drivers are enabled in RTL8231"
This will change the default fan speed from what
bootloader has set.

Signed-off-by: Evan Jobling <evan.jobling at mslsc.com.au>
---
 .../realtek/dts/rtl8393_hpe_1920-48g-poe.dts  | 20 +++++++++++++++++++
 target/linux/realtek/image/rtl839x.mk         |  4 +++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/target/linux/realtek/dts/rtl8393_hpe_1920-48g-poe.dts b/target/linux/realtek/dts/rtl8393_hpe_1920-48g-poe.dts
index e242775434..297db96266 100644
--- a/target/linux/realtek/dts/rtl8393_hpe_1920-48g-poe.dts
+++ b/target/linux/realtek/dts/rtl8393_hpe_1920-48g-poe.dts
@@ -5,8 +5,28 @@
 / {
 	compatible = "hpe,1920-48g-poe", "realtek,rtl8393-soc";
 	model = "HPE 1920-48G-PoE (JG928A)";
+
+	gpio1: rtl8231-gpio {
+			compatible = "realtek,rtl8231-gpio";
+			#gpio-cells = <2>;
+			gpio-controller;
+			indirect-access-bus-id = <0>;
+	};
+
+	gpio_fan_array {
+		compatible = "gpio-fan";
+		target-rpm = <10000>;
+
+		gpios = <&gpio1 5 GPIO_ACTIVE_HIGH>;
+		gpio-fan,speed-map =    <5000 0>,
+		                        <8200 1>;
+
+		alarm-gpios = <&gpio1 6 GPIO_ACTIVE_LOW>;
+		#cooling-cells = <2>;
+	};
 };
 
+
 &uart1 {
 	status = "okay";
 };
diff --git a/target/linux/realtek/image/rtl839x.mk b/target/linux/realtek/image/rtl839x.mk
index 14d23ff371..806ed5e70d 100644
--- a/target/linux/realtek/image/rtl839x.mk
+++ b/target/linux/realtek/image/rtl839x.mk
@@ -21,7 +21,9 @@ define Device/hpe_1920-48g-poe
   $(Device/hpe_1920)
   SOC := rtl8393
   DEVICE_MODEL := 1920-48G-PoE (JG928A)
-  DEVICE_PACKAGES += realtek-poe
+  DEVICE_PACKAGES += \
+			realtek-poe \
+			kmod-hwmon-gpiofan
   H3C_DEVICE_ID := 0x0001002b
 endef
 TARGET_DEVICES += hpe_1920-48g-poe
-- 
2.39.5