lantiq: add support for AVM FRITZ!Box 7362 SL

Hardware:
- SoC: Lantiq VRX288
- RAM: Winbond W971GG6JB 1 Gb (128 MiB)
- Flash:
  - SPI: 8 Mb (1 MiB) for bootloader and tffs
  - NAND: 1 Gb (128 MiB) for OS
- xDSL: Lantiq VRX208
- WLAN: Atheros AR9381
- DECT: Dialog Semiconductors SC14441

Everything except FXS/DECT works
(no drivers for AVM's FXS implementation with SC14441).

Installation via FTP:
1. Use scripts/flashing/eva_ramboot.py to send initramfs-kernel.bin
to the device when powering on.
Standard AVM procedures with finding the correct IP address and
the right moment to open FTP apply here (approx. 4 seconds on 7362SL).
IMPORTANT: set lzma compression in ramdisk options, bootloader stalls
when receiving uncompressed images.

2. Transfer sysupgrade.bin image with scp to /tmp directory
and run sysupgrade

3. First boot might take a bit longer if linux_fs_start was set to 1,
in that case the device will reboot twice, first time it will fail to load
second kernel (overwritten by ubifs), set linux_fs_start to 0 and reboot.

OpenWrt uses the entire NAND flash. Kernel uses 4 MiB and rootfs uses
the rest of 124 MiB, overwriting everything related to FRITZ!OS - both
OS images, config and answering machine/media server data.
To return to FRITZ!OS, use AVM's recovery image.

Signed-off-by: Danijel Tudek <danijel.tudek@gmail.com>

1 files changed, 135 insertions, 0 deletions

diff --git a/target/linux/lantiq/files-4.14/arch/mips/boot/dts/FRITZ7362SL.dts b/target/linux/lantiq/files-4.14/arch/mips/boot/dts/FRITZ7362SL.dts
new file mode 100644
index 0000000000..7a6272b988
--- /dev/null
+++ b/target/linux/lantiq/files-4.14/arch/mips/boot/dts/FRITZ7362SL.dts
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "FRITZ736X.dtsi"
+
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/mips/lantiq_rcu_gphy.h>
+
+/ {
+	compatible = "avm,fritz7362sl", "avm,fritz736x", "lantiq,xway", "lantiq,vr9";
+	model = "AVM FRITZ!Box 7362 SL";
+};
+
+&power_green {
+	label = "fritz7362sl:green:power";
+};
+
+&power_red {
+	label = "fritz7362sl:red:power";
+};
+
+&info_green {
+	label = "fritz7362sl:green:info";
+};
+
+&wifi {
+	label = "fritz7362sl:green:wlan";
+};
+
+&info_red {
+	label = "fritz7362sl:red:info";
+};
+
+&dect {
+	label = "fritz7362sl:green:dect";
+};
+
+&gpio {
+	pins_spi_default: pins_spi_default {
+		spi_in {
+			lantiq,groups = "spi_di";
+			lantiq,function = "spi";
+		};
+
+		spi_out {
+			lantiq,groups = "spi_do", "spi_clk",
+				"spi_cs4";
+			lantiq,function = "spi";
+			lantiq,output = <1>;
+		};
+	};
+};
+
+&state_default {
+	nand {
+		lantiq,groups = "nand ale", "nand cle",
+				"nand cs1", "nand rd", "nand rdy";
+		lantiq,function = "ebu";
+	};
+
+	pcie-rst {
+		lantiq,pins = "io21";
+		lantiq,open-drain = <1>;
+		lantiq,output = <1>;
+	};
+};
+
+&spi {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pins_spi_default>;
+
+	flash@4 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		reg = <4 0>;
+		spi-max-frequency = <1000000>;
+
+		urlader: partition@0 {
+			reg = <0x0 0x40000>;
+			label = "urlader";
+			read-only;
+		};
+
+		partition@40000 {
+			reg = <0x40000 0x60000>;
+			label = "tffs (1)";
+			read-only;
+		};
+
+		partition@A0000 {
+			reg = <0xA0000 0x60000>;
+			label = "tffs (2)";
+			read-only;
+		};
+	};
+};
+
+&localbus {
+	nand@1 {
+		compatible = "lantiq,nand-xway";
+		lantiq,cs1 = <1>;
+		bank-width = <1>;
+		reg = <1 0x0 0x2000000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		nand-ecc-mode = "on-die";
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "kernel";
+				reg = <0x0 0x400000>;
+			};
+
+			partition@400000 {
+				label = "ubi";
+				reg = <0x400000 0x7c00000>;
+			};
+		};
+	};
+};
+
+&pcie0 {
+	gpio-reset = <&gpio 21 GPIO_ACTIVE_LOW>;
+
+	pcie@0 {
+		#size-cells = <1>;
+		#address-cells = <2>;
+	};
+};