ipq40xx: add support for EnGenius ENS620EXT

Hardware
--------
CPU:   Qualcomm IPQ4018
RAM:   256M
FLASH: 32M SPI NOR W25Q256
ETH:   QCA8075
WiFi2: IPQ4018 2T2R 2SS b/g/n
WiFi5: IPQ4018 2T2R 2SS n/ac
LED:    - Power amber
        - LAN1(PoE) green
        - LAN2 green
        - Wi-Fi 2.4GHz green
        - Wi-Fi 5GHz green
BTN:    - WPS
UART:  115200n8 3.3V J1
       VCC(1) - GND(2) - TX(3) - RX(4)

Added basic support to get the device up and running for a sysupgrade
image only.
There is currently no way back to factory firmware, so this is a one-way
street to OpenWRT.
Install from factory condition is convoluted, and may brick your device:
1) Enable SSH and disable the CLI on the factory device from the web user
   interface (Management->Advanced)
2) Reboot the device
3) Override the default, limited SSH shell:
   a) Get into the ssh shell:
      ssh admin@192.168.1.1 /bin/sh --login
   b) Change the dropbear script to disable the limited shell. At the
      empty command prompt type:
        sed -i '/login_ssh/s/^/#/g’ dropbear
        /etc/init.d/dropbear restart
        exit
4) ssh in to a (now-) normal OpenWRT SSH session
5) Flash your built image
   a) scp openwrt-ipq40xx-engenius_ens620ext-squashfs-sysupgrade.bin
      admin@192.168.1.1:/tmp/
   b) ssh admin@192.168.1.1
   c) sysupgrade -n
      /tmp/openwrt-ipq40xx-engenius_ens620ext-squashfs-sysupgrade.bin
6) After flash completes (it may say "Upgrade failed" followed by
   "Upgrade completed") and device reboots, log in to newly flashed
   system. Note you will now need to ssh as root rather than admin.

Signed-off-by: Steve Glennon <s.glennon@cablelabs.com>
[whitespace fixes, reordered partitions, removed rng node from 4.14,
fixed 901-arm-boot-add-dts-files.patch]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

1 files changed, 252 insertions, 0 deletions

diff --git a/target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-ens620ext.dts b/target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-ens620ext.dts
new file mode 100644
index 0000000000..f676ff61cb
--- /dev/null
+++ b/target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-ens620ext.dts
@@ -0,0 +1,252 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qcom-ipq4019.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/soc/qcom,tcsr.h>
+
+/ {
+	model = "EnGenius ENS620EXT";
+	compatible = "engenius,ens620ext";
+
+	memory {
+		device_type = "memory";
+		reg = <0x80000000 0x10000000>;
+	};
+
+	aliases {
+		led-boot = &power;
+		led-failsafe = &power;
+		led-running = &power;
+		led-upgrade = &power;
+	};
+
+	soc {
+		mdio@90000 {
+			status = "okay";
+		};
+
+		ess-psgmii@98000 {
+			status = "okay";
+		};
+
+		tcsr@1949000 {
+			compatible = "qcom,tcsr";
+			reg = <0x1949000 0x100>;
+			qcom,wifi_glb_cfg = <TCSR_WIFI_GLB_CFG>;
+		};
+
+		ess_tcsr@1953000 {
+			compatible = "qcom,tcsr";
+			reg = <0x1953000 0x1000>;
+			qcom,ess-interface-select = <TCSR_ESS_PSGMII>;
+		};
+
+		tcsr@1957000 {
+			compatible = "qcom,tcsr";
+			reg = <0x1957000 0x100>;
+			qcom,wifi_noc_memtype_m0_m2 = <TCSR_WIFI_NOC_MEMTYPE_M0_M2>;
+		};
+
+		crypto@8e3a000 {
+			status = "okay";
+		};
+
+		watchdog@b017000 {
+			status = "okay";
+		};
+
+		ess-switch@c000000 {
+			status = "okay";
+		};
+
+		edma@c080000 {
+			status = "okay";
+		};
+	};
+
+	buttons {
+		compatible = "gpio-keys";
+
+		wps {
+			label = "wps";
+			gpios = <&tlmm 63 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		power: power {
+			label = "ens620ext:amber:power";
+			gpios = <&tlmm 58 GPIO_ACTIVE_LOW>;
+		};
+
+		lan1 {
+			label = "ens620ext:green:lan1";
+			gpios = <&tlmm 1 GPIO_ACTIVE_LOW>;
+		};
+
+		lan2 {
+			label = "ens620ext:green:lan2";
+			gpios = <&tlmm 2 GPIO_ACTIVE_LOW>;
+		};
+
+		wlan2G {
+			label = "ens620ext:green:wlan2G";
+			gpios = <&tlmm 3 GPIO_ACTIVE_HIGH>;
+		};
+
+		wlan5G {
+			label = "ens620ext:green:wlan5G";
+			gpios = <&tlmm 0 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&cryptobam {
+	status = "okay";
+};
+
+&blsp_dma {
+	status = "okay";
+};
+
+&tlmm {
+	serial_pins: serial_pinmux {
+		mux {
+			pins = "gpio60", "gpio61";
+			function = "blsp_uart0";
+			bias-disable;
+		};
+	};
+
+	spi_0_pins: spi_0_pinmux {
+		mux {
+			function = "blsp_spi0";
+			pins = "gpio55", "gpio56", "gpio57";
+			drive-strength = <12>;
+			bias-disable;
+		};
+
+		mux_cs {
+			function = "gpio";
+			pins = "gpio54";
+			drive-strength = <2>;
+			bias-disable;
+			output-high;
+		};
+	};
+};
+
+&blsp1_spi1 { /* BLSP1 QUP1 */
+	pinctrl-0 = <&spi_0_pins>;
+	pinctrl-names = "default";
+	status = "okay";
+	cs-gpios = <&tlmm 54 GPIO_ACTIVE_HIGH>;
+
+	flash@0 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <50000000>;
+		m25p,fast-read;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "SBL1";
+				reg = <0x00000000 0x00040000>;
+				read-only;
+			};
+			partition@40000 {
+				label = "MIBIB";
+				reg = <0x00040000 0x00020000>;
+				read-only;
+			};
+			partition@60000 {
+				label = "QSEE";
+				reg = <0x00060000 0x00060000>;
+				read-only;
+			};
+			partition@c0000 {
+				label = "CDT";
+				reg = <0x000c0000 0x00010000>;
+				read-only;
+			};
+			partition@d0000 {
+				label = "DDRPARAMS";
+				reg = <0x000d0000 0x00010000>;
+				read-only;
+			};
+			partition@e0000 {
+				label = "APPSBLENV"; /* uboot env*/
+				reg = <0x000e0000 0x00010000>;
+				read-only;
+			};
+			partition@f0000 {
+				label = "APPSBL"; /* uboot */
+				reg = <0x000f0000 0x00090000>;
+				read-only;
+			};
+			partition@180000 {
+				label = "ART";
+				reg = <0x00180000 0x00010000>;
+				read-only;
+			};
+			partition@190000 {
+				compatible = "denx,fit";
+				label = "firmware";
+				reg = <0x00190000 0x14d0000>;
+			};
+			partition@1660000 {
+				label = "failsafe";
+				reg = <0x01660000 0x008f0000>;
+				read-only;
+			};
+			partition@1f50000 {
+				label = "u-boot-env";
+				reg = <0x01f50000 0x00010000>;
+				read-only;
+			};
+			partition@1f60000 {
+				label = "userconfig";
+				reg = <0x01f60000 0x000a0000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&blsp1_uart1 {
+	pinctrl-0 = <&serial_pins>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&usb3_ss_phy {
+	status = "okay";
+};
+
+&usb3_hs_phy {
+	status = "okay";
+};
+
+&usb2_hs_phy {
+	status = "okay";
+};
+
+&wifi0 {
+	status = "okay";
+	qcom,ath10k-calibration-variant = "EnGenius-ENS620EXT";
+};
+
+&wifi1 {
+	status = "okay";
+	qcom,ath10k-calibration-variant = "EnGenius-ENS620EXT";
+};