mvebu: new subtarget cortex A53

This commit introduces new subtarget for Marvell EBU Armada Cortex A53
processor based devices.

The first device is Globalscale ESPRESSObin. Some hardware specs:

SoC: Marvell Armada 3700LP (88F3720) dual core ARM Cortex A53
     processor up to 1.2GHz
RAM: 512MB, 1GB or 2GB DDR3
Storage: SATA interface
         µSD card slot with footprint for an optional 4GB EMMC
         4MB SPI NOR flash for bootloader
Ethernet: Topaz Networking Switch (88E6341) with 3x GbE ports
Connectors: USB 3.0
            USB 2.0
            µUSB port connected to PL2303SA (USB to serial bridge
            controller) for UART access
Expansion: 2x 46-pin GPIO headers for accessories and shields with
           I2C, GPIOs, PWM, UART, SPI, MMC, etc
           MiniPCIe slot
Misc: Reset button, JTAG interface

Currently booting only from µSD card is supported.
The boards depending on date of dispatch can come with various U-Boot
versions. For the newest version 2017.03-armada-17.10 no manual
intervention should be needed to boot OpenWrt image. For the older ones
it's necessary to modify default U-Boot environment:

 1. Interrupt boot process to run U-Boot command line,

 2. Run following commands:
    (for version 2017.03-armada-17.06 and 2017.03-armada-17.08)
     setenv bootcmd "load mmc 0:1 0x4d00000 boot.scr; source 0x4d00000"
     saveenv

    (for version 2015.01-armada-17.02 and 2015.01-armada-17.04)
     setenv bootargs "console=ttyMV0,115200 root=/dev/mmcblk0p2 rw rootwait"
     setenv bootcmd "ext4load mmc 0:1 ${fdt_addr} armada-3720-espressobin.dtb; ext4load mmc 0:1 ${kernel_addr} Image; booti ${kernel_addr} - ${fdt_addr}"
     saveenv

 3. Poweroff, insert SD card with OpenWrt image, boot and enjoy.

Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>

1 files changed, 48 insertions, 0 deletions

diff --git a/target/linux/mvebu/patches-4.14/507-arm64-dts-marvell-armada-37xx-add-nodes-allowing-cpu.patch b/target/linux/mvebu/patches-4.14/507-arm64-dts-marvell-armada-37xx-add-nodes-allowing-cpu.patch
new file mode 100644
index 0000000000..dd3727c554
--- /dev/null
+++ b/target/linux/mvebu/patches-4.14/507-arm64-dts-marvell-armada-37xx-add-nodes-allowing-cpu.patch
@@ -0,0 +1,48 @@
+From e8d66e7927b2a15310df0eb44a67d120ea147a59 Mon Sep 17 00:00:00 2001
+From: Gregory CLEMENT <gregory.clement@free-electrons.com>
+Date: Thu, 14 Dec 2017 16:00:06 +0100
+Subject: arm64: dts: marvell: armada-37xx: add nodes allowing cpufreq
+ support
+
+In order to be able to use cpu freq, we need to associate a clock to each
+CPU and to expose the power management registers.
+
+Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
+---
+ arch/arm64/boot/dts/marvell/armada-372x.dtsi | 1 +
+ arch/arm64/boot/dts/marvell/armada-37xx.dtsi | 7 +++++++
+ 2 files changed, 8 insertions(+)
+
+--- a/arch/arm64/boot/dts/marvell/armada-372x.dtsi
++++ b/arch/arm64/boot/dts/marvell/armada-372x.dtsi
+@@ -56,6 +56,7 @@
+ 			device_type = "cpu";
+ 			compatible = "arm,cortex-a53","arm,armv8";
+ 			reg = <0x1>;
++			clocks = <&nb_periph_clk 16>;
+ 			enable-method = "psci";
+ 		};
+ 	};
+--- a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
++++ b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
+@@ -64,6 +64,7 @@
+ 			device_type = "cpu";
+ 			compatible = "arm,cortex-a53", "arm,armv8";
+ 			reg = <0>;
++			clocks = <&nb_periph_clk 16>;
+ 			enable-method = "psci";
+ 		};
+ 	};
+@@ -219,6 +220,12 @@
+ 				};
+ 			};
+ 
++			nb_pm: syscon@14000 {
++				compatible = "marvell,armada-3700-nb-pm",
++					     "syscon";
++				reg = <0x14000 0x60>;
++			};
++
+ 			pinctrl_sb: pinctrl@18800 {
+ 				compatible = "marvell,armada3710-sb-pinctrl",
+ 					     "syscon", "simple-mfd";