SPI/zh

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1 RK3399

RK3399下，SPI由于与UART4共用引脚，所以需要修改内核DTS文件。

1.1 Linux下启用SPI

下载内核源代码，编辑内核目录下的dts文件 arch/arm64/boot/dts/rockchip/rk3399-nanopi4-common.dtsi: 

git clone https://github.com/friendlyarm/kernel-rockchip --depth 1 -b nanopi4-linux-v4.4.y kernel-rockchip
cd kernel-rockchip
vim arch/arm64/boot/dts/rockchip/rk3399-nanopi4-common.dtsi

首先找到 spi1 的定义: 

&spi1 {
    status = "disabled";  // 将其中的 disabled 改为 okay

然后在 rk3399-nanopi4-common.dtsi 文件到找到 uart4 的定义： 

&uart4 {
    status = "okay";   // 将其中的 okay 改为 disabled

最后重新编译内核 (编译器: gcc6.4): 

make ARCH=arm64 nanopi4_linux_defconfig
export PATH=/opt/FriendlyARM/toolchain/6.4-aarch64/bin/:$PATH
make ARCH=arm64 nanopi4-images

编译完成后会生成 kernel.img resource.img 这两个文件，将其拷贝到eflasher系统的SD卡覆盖旧文件即可, 假设SD卡的FRIENDLYARM分区挂载到FRIENDLYARM目录，更新命令如下： 

# for Lubuntu
cp kernel.img resource.img /media/FRIENDLYARM/lubuntu/
 
# for FriendlyCore
cp kernel.img resource.img /media/FRIENDLYARM/friendlycore-arm64/
 
# for FriendlyDesktop
cp kernel.img resource.img /media/FRIENDLYARM/friendlydesktop-arm64/

也可以用线刷工具来更新。

1.2 Android下启用SPI

Android下修改方法如下:
编辑内核目录下的dts文件 arch/arm64/boot/dts/rockchip/rk3399-nanopi4-common.dtsi: 

cd ANDROID_SOURCE/kernel
vim arch/arm64/boot/dts/rockchip/rk3399-nanopi4-common.dtsi

其中，ANDROID_SOURCE请替换为真实的 Android7或Android8源代码目录。

首先找到 spi1 的定义: 

&spi1 {
    status = "disabled";  // 将其中的 disabled 改为 okay

然后再在 rk3399-nanopi4-common.dtsi 文件到找到 uart4 的定义： 

&uart4 {
    status = "okay";   // 将其中的 okay 改为 disabled

最后重新编译内核: 

cd ANDROID_SOURCE/
./build-nanopc-t4.sh -K -M

更新 rockdev/Image-nanopc_t4/resource.img 到开发板即可，可以将resource.img拷贝到安装有 eflasher 系统的TF卡中，位置是FriendlyARM分区的androidX 目录，替换里面的resource.img文件，然后用TF卡重刷系统。

2 S5P4418

2.1 Q: S5P4418的/dev目录下只有一个spidev0.0这个设备节点, 怎么添加spidev1.0

对于3.4内核来说，4418 需要修改 arch/arm/plat-s5p4418/nanopi2/device.c;
想要增加一路的话，可先搜索 CONFIG_SPI_SPIDEV , 然后参考已有代码增加另一路的支持;
另外，arch/arm/plat-s5p4418/asb/device.c 有 spi2 的支持，修改时可参考;

3 H5

3.1 使用/dev/spidev0.0

在板子上执行下面的命令:

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4cs, 6502acme, 6502kickass, 6502tasm, 68000devpac, abap, actionscript, actionscript3, ada, aimms, algol68, apache, applescript, arm, asm, asp, asymptote, autoconf, autohotkey, autoit, avisynth, awk, bascomavr, bash, basic4gl, bf, bibtex, blitzbasic, bnf, boo, c, caddcl, cadlisp, cfdg, cfm, chaiscript, chapel, cil, clojure, cmake, cobol, coffeescript, cpp, csharp, css, cuesheet, d, dart, dcl, dcpu16, dcs, delphi, diff, div, dos, dot, e, ecmascript, eiffel, email, epc, erlang, euphoria, ezt, f1, falcon, fo, fortran, freebasic, freeswitch, fsharp, gambas, gdb, genero, genie, gettext, glsl, gml, gnuplot, go, groovy, gwbasic, haskell, haxe, hicest, hq9plus, html4strict, html5, icon, idl, ini, inno, intercal, io, ispfpanel, j, java, java5, javascript, jcl, jquery, kixtart, klonec, klonecpp, latex, lb, ldif, lisp, llvm, locobasic, logtalk, lolcode, lotusformulas, lotusscript, lscript, lsl2, lua, m68k, magiksf, make, mapbasic, matlab, mirc, mmix, modula2, modula3, mpasm, mxml, mysql, nagios, netrexx, newlisp, nginx, nimrod, nsis, oberon2, objc, objeck, ocaml, octave, oobas, oorexx, oracle11, oracle8, oxygene, oz, parasail, parigp, pascal, pcre, per, perl, perl6, pf, php, pic16, pike, pixelbender, pli, plsql, postgresql, postscript, povray, powerbuilder, powershell, proftpd, progress, prolog, properties, providex, purebasic, pycon, pys60, python, q, qbasic, qml, racket, rails, rbs, rebol, reg, rexx, robots, rpmspec, rsplus, ruby, rust, sas, scala, scheme, scilab, scl, sdlbasic, smalltalk, smarty, spark, sparql, sql, standardml, stonescript, systemverilog, tcl, teraterm, text, thinbasic, tsql, typoscript, unicon, upc, urbi, uscript, vala, vb, vbnet, vbscript, vedit, verilog, vhdl, vim, visualfoxpro, visualprolog, whitespace, whois, winbatch, xbasic, xml, xpp, yaml, z80, zxbasic


$ wget https://github.com/friendlyarm/linux/blob/sunxi-4.14.y/tools/spi/spidev_test.c
$ gcc spidev_test.c -o spidev_test
$ ./spidev_test -D /dev/spidev0.0 -S 1024 -I 1000


3.2 使能SPI1

H5的SPI1和UART3的引脚是复用的，我们默认提供的配置是使能UART3，禁用SPI1，内核设备树的配置如下：
linux/arch/arm64/boot/dts/allwinner/sun50i-h5-nanopi.dtsi 

&spi1 {
    // against uart3_rts_cts_pins
    status = "disable";
    spidev1: spi@1 {
        compatible = "nanopi,spidev";
        reg = <0>;
        spi-max-frequency = <10000000>;
    };
};
 
&uart3 {
    pinctrl-names = "default";
    pinctrl-0 = <&uart3_pins>, <&uart3_rts_cts_pins>;
    status = "okay";
};

如果想使能SPI1，需要修改设备树如下： 

&spi1 {
    // against uart3_rts_cts_pins
    status = "okay";
    spidev1: spi@1 {
        compatible = "nanopi,spidev";
        reg = <0>;
        spi-max-frequency = <10000000>;
    };
};
 
&uart3 {
    pinctrl-names = "default";
    pinctrl-0 = <&uart3_pins>, <&uart3_rts_cts_pins>;
    status = "disable";
};

另外，使用npi-config/zh也可以实现上述目的。

3.3 SPI Flash

FriendlyElec H5的Linux-4.14内核集成了"mxicy,mx25l12805d"的SPI Flash驱动，使用的是SPI0，但是默认并没有使能，相关的dts配置如下: 

$ cat linux/arch/arm64/boot/dts/allwinner/sun50i-h5-nanopi.dtsi
&spi0 {
	...
	spiflash: spiflash@0 {
		#address-cells = <1>;
		#size-cells = <1>;
		compatible = "mxicy,mx25l12805d";
		reg = <0>;
		status = "disabled";        // disabled表示禁用该驱动
 
		spi-max-frequency = <50000000>;
		mode = <0>;
 
		partition@0 {
			reg = <0x0 0x1000000>;
			label = "spi-flash";
		};
	};
    ...

可以在npi-config里将其使能，如下: 

$ npi-config
	6 Advanced Options| Configure advanced setting
		A5 SPI| Enable/Disable SPI
			spi0 Enable/Disable spi0[enabled]
				spidev0.0| SPI0 char device
				spi-2.8'tft| Matrix-2'8_SPI_Key_TFT
				spi-flash| SPI0 flash(X)

设置完毕后，dtb里spi flash的status = "okay"，需要重启系统才能生效。
启动Linux系统时，看到类似下面的启动信息则说明SPI Flash被成功检测到了:

m25p80 spi0.0: mx25l12805d (16384 Kbytes)
1 ofpart partitions found on MTD device spi0.0
Creating 1 MTD partitions on "spi0.0":
0x000000000000-0x000001000000 : "spi-flash"

SPI Flash在Linux系统下的使用方法如下:

$ cat /sys/class/mtd/mtd0/size          # 以byte为单位
$ cat /sys/class/block/mtdblock0/size   # 以sector(512 byte)为单位
$ apt-get install mtd-utils 
$ flash_eraseall -j /dev/mtd0           # 格式成jffs2的格式
$ mount -t jffs2 /dev/mtdblock0 /mnt    
$ mkfs.ext4 /dev/mtdblock0              # 也格式化为ext4
$ mount -t ext4 /dev/mtdblock0 /mnt

4 H3/H2+

4.1 SPI Flash

FriendlyElec H3/H2+的Linux-4.14内核集成了"mxicy,mx25l12805d"的SPI Flash驱动，使用的是SPI0，但是默认并没有使能，相关的dts配置如下: 

$ cat linux/arch/arm/boot/dts/sun8i-h3-nanopi.dtsi
&spi0 {
	...
	spiflash: spiflash@0 {
		#address-cells = <1>;
		#size-cells = <1>;
		compatible = "mxicy,mx25l12805d";
		reg = <0>;
		status = "disabled";        // disabled表示禁用该驱动
 
		spi-max-frequency = <50000000>;
		mode = <0>;
 
		partition@0 {
			reg = <0x0 0x1000000>;
			label = "spi-flash";
		};
	};
    ...

可以在npi-config里将其使能，如下: 

$ npi-config
	6 Advanced Options| Configure advanced setting
		A5 SPI| Enable/Disable SPI
			spi0 Enable/Disable spi0[enabled]
				spidev0.0| SPI0 char device
				spi-2.8'tft| Matrix-2'8_SPI_Key_TFT
				spi-flash| SPI0 flash(X)

设置完毕后，dtb里spi flash的status = "okay"，需要重启系统才能生效。
启动Linux系统时，看到类似下面的启动信息则说明SPI Flash被成功检测到了:

m25p80 spi0.0: mx25l12805d (16384 Kbytes)
1 ofpart partitions found on MTD device spi0.0
Creating 1 MTD partitions on "spi0.0":
0x000000000000-0x000001000000 : "spi-flash"

SPI Flash在Linux系统下的使用方法如下:

$ cat /sys/class/mtd/mtd0/size          # 以byte为单位
$ cat /sys/class/block/mtdblock0/size   # 以sector(512 byte)为单位
$ apt-get install mtd-utils 
$ flash_eraseall -j /dev/mtd0           # 格式成jffs2的格式
$ mount -t jffs2 /dev/mtdblock0 /mnt    
$ mkfs.ext4 /dev/mtdblock0              # 也格式化为ext4
$ mount -t ext4 /dev/mtdblock0 /mnt
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