ipq40xx: Add support for Linksys MR8300 (Dallas)

The Linksys MR8300 is based on QCA4019 and QCA9888
and provides three, independent radios.
NAND provides two, alternate kernel/firmware images
with fail-over provided by the OEM U-Boot.

Hardware Highlights:

SoC: IPQ4019 at 717 MHz (4 CPUs)
RAM: 512MB RAM

SoC:	Qualcomm IPQ4019 at 717 MHz (4 CPUs)
RAM:	512M DDR3
FLASH:	256 MB NAND (Winbond W29N02GV, 8-bit parallel)
ETH:	Qualcomm QCA8075 (4x GigE LAN, 1x GigE Internet Ethernet Jacks)
BTN:	Reset and WPS
USB:	USB3.0, single port on rear with LED
SERIAL:	Serial pads internal (unpopulated)
LED:	Four status lights on top + USB LED
WIFI1:	2x2:2 QCA4019 2.4 GHz radio on ch. 1-14
WIFI2:  2x2:2 QCA4019 5 GHz radio on ch. 36-64
WIFI3:  2x2:2 QCA9888 5 GHz radio on ch. 100-165

Support is based on the already supported EA8300.
Key differences:
	EA8300 has 256MB RAM where MR8300 has 512MB RAM.
	MR8300 has a revised top panel LED setup.

Installation:
"Factory" images may be installed directly through the OEM GUI using
URL: https://ip-of-router/fwupdate.html (Typically 192.168.1.1)

Signed-off-by: Hans Geiblinger <cybrnook2002@yahoo.com>
[copied Hardware-highlights from EA8300. Fixed alphabetical order.
fixed commit subject, removed bogus unit-address of keys,
fixed author (used Signed-off-By to From:) ]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

1 files changed, 82 insertions, 0 deletions

diff --git a/target/linux/ipq40xx/files/arch/arm/boot/dts/qcom-ipq4019-mr8300.dts b/target/linux/ipq40xx/files/arch/arm/boot/dts/qcom-ipq4019-mr8300.dts
new file mode 100644
index 0000000000..4818a2df59
--- /dev/null
+++ b/target/linux/ipq40xx/files/arch/arm/boot/dts/qcom-ipq4019-mr8300.dts
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+
+#include "qcom-ipq4019-xx8300.dtsi"
+
+/ {
+	model = "Linksys MR8300 (Dallas)";
+	compatible = "linksys,mr8300", "qcom,ipq4019";
+
+	aliases {
+		led-boot = &led_blue;
+		led-failsafe = &led_red;
+		led-running = &led_blue;
+		led-upgrade = &led_amber;
+		serial0 = &blsp1_uart1;
+	};
+
+	// Top panel LEDs, above Linksys logo
+	leds {
+		compatible = "gpio-leds";
+
+		led_red: red {
+			label = "mr8300:red:alarm";
+			gpios = <&tlmm 47 GPIO_ACTIVE_HIGH>;
+		};
+
+		led_amber: amber {
+			label = "mr8300:amber:programming";
+			gpios = <&tlmm 22 GPIO_ACTIVE_HIGH>;
+			panic-indicator;
+		};
+
+		led_blue: blue {
+			label = "mr8300:blue:power";
+			gpios = <&tlmm 46 GPIO_ACTIVE_HIGH>;
+		};
+
+		// On back panel, above USB socket
+
+		led_usb: usb {
+			label = "mr8300:green:usb";
+			gpios = <&tlmm 61 GPIO_ACTIVE_LOW>;
+			trigger-sources = <&usb3_port1>, <&usb3_port2>,
+					  <&usb2_port1>;
+			linux,default-trigger = "usbport";
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&tlmm 50 GPIO_ACTIVE_LOW>;
+		};
+
+		wps {
+			label = "wps";
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&tlmm 18 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&wifi0 {
+	status = "okay";
+	qcom,ath10k-calibration-variant = "linksys-mr8300-v0-fcc";
+};
+
+&wifi1 {
+	status = "okay";
+	ieee80211-freq-limit = <5170000 5330000>;
+	qcom,ath10k-calibration-variant = "linksys-mr8300-v0-fcc";
+};
+
+&wifi2 {
+	status = "okay";
+	ieee80211-freq-limit = <5490000 5835000>;
+	qcom,ath10k-calibration-variant = "linksys-mr8300-v0-fcc";
+};