board/orangepi: add basic support for orangepi-zero board

This patch adds basic support for orangepi-zero board.
Board support package includes the following components:

- mainline kernel v4.11
- mainline u-boot v2017.03
- extra kernel config options: spidev, spi nor flash, wifi
- dts patches to enable SPI NOR and spidev

More details about this board are available here:
- http://linux-sunxi.org/Orange_Pi_Zero

Note that at the moment networking is not supported right out of the box.
Ethernet submission to mainline kernel is a work in progress, see the
latest dwmac-sun8i branches at https://github.com/montjoie/linux

On-board SDIO WiFi chip XR819 is supported by off-the-tree wireless
driver available at https://github.com/fifteenhex/xradio

Changes from v1:

* Send patch using proper subject
* Update xr819 kernel dts patch: add compatible property

[Peter: fix s/PC/Zero/ typo]
Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

board/orangepi/orangepi-zero/boot.cmd

@@ -0,0 +1,8 @@
+setenv fdt_high ffffffff
+
+setenv bootargs console=ttyS0,115200 earlyprintk root=/dev/mmcblk0p2 rootwait
+
+fatload mmc 0 $kernel_addr_r zImage
+fatload mmc 0 $fdt_addr_r sun8i-h2-plus-orangepi-zero.dtb
+
+bootz $kernel_addr_r - $fdt_addr_r

board/orangepi/orangepi-zero/genimage.cfg

@@ -0,0 +1,36 @@
+# Minimal SD card image for the OrangePi Zero
+#
+image boot.vfat {
+	vfat {
+		files = {
+			"zImage",
+			"sun8i-h2-plus-orangepi-zero.dtb",
+			"boot.scr"
+		}
+	}
+	size = 10M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition u-boot {
+		in-partition-table = "no"
+		image = "u-boot-sunxi-with-spl.bin"
+		offset = 8192
+		size = 1040384 # 1MB - 8192
+	}
+
+	partition boot {
+		partition-type = 0xC
+		bootable = "true"
+		image = "boot.vfat"
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+		size = 512M
+	}
+}

board/orangepi/orangepi-zero/linux-extras.config

@@ -0,0 +1,17 @@
+# spidev
+CONFIG_SPI_SPIDEV=y
+
+# spi nor
+CONFIG_MTD=y
+CONFIG_MTD_OF_PARTS=y
+CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_M25P80=y
+
+# wireless core
+CONFIG_WIRELESS=y
+CONFIG_CFG80211=y
+CONFIG_MAC80211=y
+CONFIG_CFG80211_WEXT=y
+
+# wireless drivers
+CONFIG_WLAN=y

board/orangepi/orangepi-zero/patches/linux/0001-ARM-dts-orange-pi-zero-interrupt-triggering-xr819.patch

@@ -0,0 +1,35 @@
+From 321faaf4b78d46a0c77782c1798856746f0619e9 Mon Sep 17 00:00:00 2001
+From: Sergey Matyukevich <geomatsi@gmail.com>
+Date: Fri, 19 May 2017 23:39:48 +0300
+Subject: [PATCH 1/3] ARM: dts: orange-pi-zero: specify XR819 WiFi chip
+ interrupts
+
+The orange-pi-zero board has Allwinner XR819 SDIO wifi chip. The board
+dts file provides a node enabling mmc1 controller. Together with an
+out-of-tree driver https://github.com/fifteenhex/xradio this node
+enables using the wifi chip.
+
+This commit specifies XR819 interrupt configuration for the driver.
+
+Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
+---
+ arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
+index b7ca916d871d..4e1a9050c6b4 100644
+--- a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
++++ b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
+@@ -125,6 +125,9 @@
+ 	 */
+ 	xr819: sdio_wifi@1 {
+ 		reg = <1>;
++		compatible = "xradio,xr819";
++		interrupt-parent = <&pio>;
++		interrupts = <6 10 IRQ_TYPE_EDGE_RISING>;
+ 	};
+ };
+ 
+-- 
+2.11.0
+

board/orangepi/orangepi-zero/patches/linux/0002-ARM-dts-orange-pi-zero-enable-spi-nor.patch

@@ -0,0 +1,42 @@
+From 068c3baff3048a3db4ef2518ff917ce749cd8169 Mon Sep 17 00:00:00 2001
+From: Sergey Matyukevich <geomatsi@gmail.com>
+Date: Sat, 20 May 2017 11:24:26 +0300
+Subject: [PATCH 2/3] ARM: dts: orange-pi-zero: enable SPI NOR
+
+Enable SPI NOR on orange-pi-zero board.
+
+For more information see:
+- http://linux-sunxi.org/Orange_Pi_Zero#SPI_NOR_flash
+
+Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
+---
+ arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts | 16 ++++++++++++++++
+ 1 file changed, 16 insertions(+)
+
+diff --git a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
+index 4e1a9050c6b4..cdf19821b1f3 100644
+--- a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
++++ b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
+@@ -161,3 +161,19 @@
+ 	/* USB VBUS is always on */
+ 	status = "okay";
+ };
++
++&spi0 {
++	status = "okay";
++
++	flash@0 {
++		#address-cells = <1>;
++		#size-cells = <1>;
++		compatible = "mxicy,mx25l1606e", "winbond,w25q128";
++		reg = <0>;
++		spi-max-frequency = <40000000>;
++
++		partition@00000000 {
++			reg = <0x00000000 0x200000>;	/* 2Mb */
++		};
++	};
++};
+-- 
+2.11.0
+

board/orangepi/orangepi-zero/patches/linux/0003-ARM-dts-orange-pi-zero-enable-spidev.patch

@@ -0,0 +1,42 @@
+From 8dd1b2a696bb7e9914abd11cc6f5c0f54c33d626 Mon Sep 17 00:00:00 2001
+From: Sergey Matyukevich <geomatsi@gmail.com>
+Date: Sat, 20 May 2017 15:36:51 +0300
+Subject: [PATCH 3/3] ARM: dts: orange-pi-zero: enable spidev
+
+On orange-pi-zero board SPI1 pins are accessible via GPIO expansion port.
+This patch enables spidev driver for SPI1.
+
+Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
+---
+ arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts | 11 +++++++++++
+ 1 file changed, 11 insertions(+)
+
+diff --git a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
+index cdf19821b1f3..7242aaecb14f 100644
+--- a/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
++++ b/arch/arm/boot/dts/sun8i-h2-plus-orangepi-zero.dts
+@@ -59,6 +59,7 @@
+ 		serial0 = &uart0;
+ 		/* ethernet0 is the H3 emac, defined in sun8i-h3.dtsi */
+ 		ethernet1 = &xr819;
++		spi1 = &spi1;
+ 	};
+ 
+ 	chosen {
+@@ -177,3 +178,13 @@
+ 		};
+ 	};
+ };
++
++&spi1 {
++	status = "okay";
++
++	spidev@0 {
++		compatible = "rohm,dh2228fv";
++		reg = <0>;
++		spi-max-frequency = <10000000>;
++	};
++};
+-- 
+2.11.0
+

board/orangepi/orangepi-zero/post-build.sh

@@ -0,0 +1 @@
+../post-build.sh

board/orangepi/orangepi-zero/post-image.sh

@@ -0,0 +1 @@
+../post-image.sh

board/orangepi/orangepi-zero/readme.txt

@@ -0,0 +1,29 @@
+OrangePi Zero
+
+Intro
+=====
+
+This default configuration will allow you to start experimenting with the
+buildroot environment for the OrangePi Zero. With the current configuration
+it will bring-up the board, and allow access through the serial console.
+
+How to build it
+===============
+
+Configure Buildroot:
+
+    $ make orangepi_zero_defconfig
+
+Compile everything and build the SD card image:
+
+    $ make
+
+How to write the SD card
+========================
+
+Once the build process is finished you will have an image called "sdcard.img"
+in the output/images/ directory.
+
+Copy the bootable "sdcard.img" onto an SD card with "dd":
+
+  $ sudo dd if=output/images/sdcard.img of=/dev/sdX

configs/orangepi_zero_defconfig

@@ -0,0 +1,42 @@
+BR2_arm=y
+BR2_cortex_a7=y
+BR2_ARM_FPU_VFPV4=y
+BR2_GLOBAL_PATCH_DIR="board/orangepi/orangepi-zero/patches"
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_11=y
+BR2_TARGET_GENERIC_HOSTNAME="OrangePi_Zero"
+BR2_TARGET_GENERIC_ISSUE="Welcome to Buildroot for the Orange Pi Zero"
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/orangepi/orangepi-zero/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/orangepi/orangepi-zero/post-image.sh"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.11"
+BR2_LINUX_KERNEL_DEFCONFIG="sunxi"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="sun8i-h2-plus-orangepi-zero"
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/orangepi/orangepi-zero/linux-extras.config"
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2017.03"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="orangepi_zero"
+BR2_TARGET_UBOOT_NEEDS_DTC=y
+BR2_TARGET_UBOOT_FORMAT_CUSTOM=y
+BR2_TARGET_UBOOT_FORMAT_CUSTOM_NAME="u-boot-sunxi-with-spl.bin"
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y
+BR2_PACKAGE_HOST_UBOOT_TOOLS=y
+
+# wireless support
+BR2_PACKAGE_IW=y
+BR2_PACKAGE_WIRELESS_TOOLS=y
+BR2_PACKAGE_WIRELESS_TOOLS_LIB=y
+BR2_PACKAGE_WPA_SUPPLICANT=y
+BR2_PACKAGE_WPA_SUPPLICANT_NL80211=y
+BR2_PACKAGE_WPA_SUPPLICANT_CLI=y
+
+# spi flash support
+BR2_PACKAGE_MTD=y